CN104174238B - A kind of filter net jam detection method of blowing device and the blowing device of application thereof - Google Patents

Abstract

The invention discloses a kind of filter net jam detection method of blowing device and the blowing device of application thereof, described blowing device comprises air inlet, air outlet, air channel, fan or wind wheel, blower motor and airstrainer, airstrainer is arranged on air channel, blower motor drives fan or wind wheel to rotate to make air to enter air channel and through airstrainer from air inlet, then export from air outlet, it is characterized in that: utilize blower motor as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks and outputs signal warning.It is without the need to increasing any hardware, simple installation, and cost is low.

Description

A kind of filter net jam detection method of blowing device and the blowing device of application thereof

Technical field:

The present invention relates to a kind of filter net jam detection method of blowing device and the blowing device of application thereof.

Background technology:

In recent years, along with appliance field competition, require to improve constantly to product technology, as required product energy-conserving and environment-protective, controllability intelligence degree is high, the construction cycle is short, noise is little.As core component---motor, becomes the critical component solved the problems of the technologies described above undoubtedly, and the motor inside traditional domestic air conditioning generally adopts load motor PSC, load motor, efficiency is low, and compare power consumption, noise also large, controllability degree of intelligence is low.Along with the development of motor technology, direct current generator replaces alternating current generator gradually, direct current generator is with electric machine controller, electric machine controller is utilized to realize the object of the electronic commutation of electric current, so also someone is called for short ECM motor (electronicallycommutatedmotor) or is DC brushless motor (BLDCMOTOR) in industry, it has energy-conserving and environment-protective, reliability and controllability are all higher, noise is little, the features such as easy realization is intelligent, the deficiency of load motor can be solved, therefore, load motor inside existing air-conditioning gradually by DC brushless motor or ECM motor get and replace.

China or other national air-conditioning of Asia, its DC MOTOR CONTROL plate connects with air-conditioning mainboard, be provided with the connection signal on 5 tunnels, be respectively: GND port, VDC port, VCC port, VSP port, FG port, this interface becomes the interface of standard substantially, air-conditioning mainboard is by exporting VSP voltage port to DC MOTOR CONTROL plate input rotating speed of target, and motor is by FG port feedback motor actual speed, and the speed closed loop realizing direct current generator controls.When the outlet and inlet of air-conditioning make a slip of the tongue filter screen or air channel blocked time, the air outlet air quantity of air-conditioning can decline, and affects air conditioner refrigerating or heating effect.This is that air-conditioning system is less desirable, for this reason, traditional B LDC motor realizes permanent wind amount or air quantity monitoring/warning function is necessary.

Existing solution: what have installs blast gauge additional to judge the size of air quantity in air outlet or air channel, and air quantity calculated by some installation air volume meters, but such hardware all needing to increase especially, installation wiring bothers, and increases extra cost.

Summary of the invention:

The object of this invention is to provide a kind of filter net jam detection method of blowing device and the blowing device of application thereof, utilize blower motor as the element detecting air quantity, when detection air quantity is lower than setting air quantity, be judged as that airstrainer blocks and outputs signal warning, without the need to increasing any hardware, simple installation, cost is low.

The object of the invention is to be achieved by following technical proposals.

A kind of filter net jam detection method of blowing device, described blowing device comprises air inlet, air outlet, air channel, fan or wind wheel, blower motor and airstrainer, airstrainer is arranged on air channel, blower motor drives fan or wind wheel to rotate to make air to enter air channel and through airstrainer from air inlet, then export from air outlet, it is characterized in that: utilize blower motor as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks and outputs signal warning.

Described blowing device is split air conditioner air-conditioning, or floor standing air-conditioner, or window-mounted air conditioner, or multi-gang air-conditioner, or air-cooled ducted air conditioner air-conditioning, or commercial coiler air-conditioning, or courtyard air conditioner, or HVAC system, or air cleaner, or air purifier.

Or described blower motor adopts BLDC motor ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, microprocessor arranges the function of Wind Coverage Calculation, the relating to parameters of the real time execution of the actual measurement air quantity that air quantity function calculates and motor.

The function Q=F (POWER, n) of Wind Coverage Calculation described above, wherein POWER is power input to a machine, and n is the rotating speed of motor.

Blower motor described above is operated in permanent wind amount control model, first whether microprocessor measured actual power and arrived in rated power, if measure actual power to reach rated power, and when the deviation detecting air quantity and setting air quantity reaches certain value, report to the police; When detecting that air quantity has deviation in allowed band with setting air quantity, select not report to the police.

Blower motor described above is operated in constant moment of force control model, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.

Blower motor described above is operated in constant speed control pattern, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.

A kind of blowing device, comprise body, air channel is provided with in body, inside body, blower motor is installed, wind wheel, airstrainer, air channel arranges air inlet and air outlet, airstrainer and wind wheel are installed inside air channel, blower motor drives wind wheel to rotate, described blower motor adopts BLDC motor or ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, it is characterized in that: blower motor input setting air quantity, blower motor is as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks.

Blowing device described above is split air conditioner air-conditioning, or floor standing air-conditioner, or window-mounted air conditioner, or multi-gang air-conditioner, or air-cooled ducted air conditioner air-conditioning, or commercial coiler air-conditioning, or courtyard air conditioner, or HVAC system, or air cleaner, or air purifier.

Above-mentioned when detecting air quantity lower than factory set value, be judged as that airstrainer blocks.

Blowing device described above is with device controller, device controller is to blower motor input setting air quantity, and microprocessor detects air quantity in real time, when detecting the deviation of air quantity with setting air quantity and reaching certain value, Microprocessor S3C44B0X warning circuit is reported to the police, the blocking of prompting airstrainer.

Warning circuit described above can be audible alarm circuit, or photoelectric alarm circuit.

Warning circuit described above can layout at device controller, also can layout inside electric machine controller.

Warning circuit described above can comprise the original liquid crystal display of blowing device, and alarm signal is first sent to device controller by microprocessor, and null device controller output signal, to liquid crystal display, utilizes word or pattern to block to point out airstrainer.

Blower motor described above is operated in permanent wind amount control model, and when the deviation detecting air quantity and setting air quantity reaches certain value, reports to the police; When detecting that air quantity has deviation in allowed band with setting air quantity, select not report to the police.

Blower motor described above is operated in constant speed control pattern, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.

Blower motor described above is operated in constant moment of force control model, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.

The present invention compared with prior art, has following effect:

1) utilize blower motor as the element detecting air quantity, when detecting the deviation of air quantity with setting air quantity and reaching certain value, be judged as that airstrainer blocks and outputs signal warning, without the need to increasing any hardware, simple installation, cost is low;

2) blower motor is operated in the control model of permanent wind amount, and first microprocessor is measured actual power and whether arrived rated power, if measure actual power to reach rated power, judge again to detect air quantity and the deviation setting air quantity, scheme is simple, and microprocessor operand is little, and feasibility is high;

3) warning circuit layout is inside electric machine controller, need not change the circuit structure of air-conditioning system master control wiring board, simply convenient;

4) warning circuit can comprise the liquid crystal display of blowing device, alarm signal is first sent to the device controller of blowing device by microprocessor, device controller outputs signal liquid crystal display, word or pattern is utilized to block to point out airstrainer, make full use of existing resource and air-conditioning system friendly interface is reported to the police, save cost.

Accompanying drawing illustrates:

Fig. 1 is the structural representation of traditional air conditioner draught fan system;

Fig. 2 is the scheme of installation of blower motor of the present invention;

Fig. 3 is the stereogram of blower motor of the present invention;

Fig. 4 is the stereogram of the electric machine controller of blower motor of the present invention;

Fig. 5 is the sectional view of blower motor of the present invention;

Fig. 6 is a kind of implementing circuit block diagram of the electric machine controller of blower motor of the present invention;

Fig. 7 is the circuit diagram that Fig. 6 is corresponding;

Fig. 8 is the control flow chart of the constant air capacity control of blower motor of the present invention;

Fig. 9 is that blower motor of the present invention records to obtain gang's permanent wind amount matched curve by experiment;

Figure 10 is the fitting experimental data curve map of the blower motor direct Power Control permanent wind amount of 1/3HP of the present invention;

Figure 11 is that blower motor of the present invention utilizes interpolation method to solve input air quantity fitting experimental data curve map arbitrarily;

Figure 12 is the control logic figure of the constant air capacity control of blower motor of the present invention;

Figure 13 is a kind of control procedure schematic diagram of the constant air capacity control of blower motor of the present invention;

Figure 14 is the another kind of control procedure schematic diagram of the constant air capacity control of blower motor of the present invention;

Figure 15 is the test result figure through experimental verification of the constant air capacity control of blower motor of the present invention;

Figure 16 is the air quantity measuring and calculating schematic diagram of blower motor of the present invention;

Figure 17 is air cleaning machine structural representation of the present invention.

Detailed description of the invention:

Below by specific embodiment, also the present invention is described in further detail by reference to the accompanying drawings.

Embodiment one:

A kind of filter net jam detection method of blowing device, described blowing device comprises air inlet, air outlet, air channel, fan or wind wheel, blower motor and airstrainer, airstrainer is arranged on air channel, blower motor drives fan or wind wheel to rotate to make air to enter air channel and through airstrainer from air inlet, then export from air outlet, it is characterized in that: utilize blower motor as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks and outputs signal warning.

Described blowing device is split air conditioner air-conditioning, or floor standing air-conditioner, or window-mounted air conditioner, or multi-gang air-conditioner, or air-cooled ducted air conditioner air-conditioning, or commercial coiler air-conditioning, or courtyard air conditioner, or HVAC system, or air cleaner, or air purifier.Described blower motor adopts BLDC motor or ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, microprocessor arranges the function of Wind Coverage Calculation, the relating to parameters of the real time execution of the actual measurement air quantity that air quantity function calculates and motor.Operational parameter detection circuit comprises the various running statuses for detecting motor in real time such as rotor position detection circuit, phase current sensing circuit, bus current testing circuit, busbar voltage testing circuit.The function Q=F (POWER, n) of Wind Coverage Calculation, wherein POWER is power input to a machine, and n is the rotating speed of motor.Blower motor can be operated in permanent wind amount control model, and first whether microprocessor measured actual power and arrived in rated power, if measure actual power to reach rated power, and when the deviation detecting air quantity and setting air quantity reaches certain value, reports to the police; When detecting that air quantity has deviation in allowed band with setting air quantity, select not report to the police, blower motor can be operated in constant moment of force control model, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.Blower motor can be operated in constant speed control pattern, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.

First introduce the circuit structure of blower motor and the Survey control principle of air quantity of the present invention's employing below:

The present invention is as shown in Figure 1, inner at a typical ventilating duct for air-conditioner (abbreviation air channel), a blower system (as gas furnace or air processing machine) has been installed, replace with " motor+wind wheel " in figure, also have airstrainer in pipeline, start air blast during electric motor starting, because air outlet is relevant with room number with the quantity of air intake vent, the standard that the design of pipeline is ununified yet, airstrainer also may have different pressure drops simultaneously.Causing carrying traditional load motor---the blower system of PSC motor is in different pipelines, and actual air quantity can be different.What invent the blower motor adopted is BLDC motor or ECM motor.

As shown in Figure 2,1) control of product is an air conditioning system controller, and air conditioning system controller controls all product operation devices and is sent to electric machine controller by the peripheral circuit of the interface of a customization and agreement configuration information.2) electric machine controller comprises a microprocessor---and single-chip microcomputer or DSP electron plate do Electric Machine Control, and it has a power unit to provide electric power to controller each several part circuit, and power supply arranges a DC bus-bar voltage and electric current.Therefore, the control of motor will carry out power delivery.The electric machine controller of low cost and batch production adopts parallel resistive circuit as electric current and voltage sensor hardware usually, feedback as system controls motor and drives actuating motor to control, such as vector controlled, Direct Torque Control, and the sensor of other types or sensorless strategy.As everyone knows, the change of any electronic building brick runtime, these changes affect accuracy of detection and persistent reason.3) blower motor rotor there are magnet body and structure, in stator side or groove, have polyphase windings.When the temperature is changed, permanent magnet and winding resistance can change, and this may cause the change that Electric Machine Control is different.Motor manufacturing process produces also change to a certain degree usually, motor aging, new motor and old motor, the accuracy of the factor controlling of contribution and persistence, in the time etc. of life, can due to variations in temperature from the magnetic flux of the motor of magnet, and demagnetization etc.In addition, the possible risk that motor shaft lost efficacy, the security of system, and will detect or monitor in real time.4) air blast: air blast is arranged on motor shaft, rotates the air-flow of generation with certain speed.The position of installing may affect operation, increases friction, low discharge, or even the direction of rotation of mistake.5) airstrainer: airstrainer should regularly replace and maintenance service.But this may be lose the tracking in a very long time.This will increase frictional influence stream pressure.6) pipe control: pipe-line system may change due to dust and pipeline breaking, the reason of Region control and the change of ON/OFF wind port system pressure.If do permanent Boiler pressure control according to actual conditions above can produce a lot of unstable factor.

As Fig. 3, Fig. 4, shown in Fig. 5, blower motor is usually by electric machine controller 2 and motor monomer 1, described motor monomer 1 comprises stator module 12, rotor assembly 13 and case component 11, stator module 13 is arranged on case component 11, motor monomer 1 is provided with the Hall element 14 of detection rotor position, rotor assembly 13 is sleeved on inner side or the outside composition of stator module 12, the control circuit board 21 that electric machine controller 2 comprises control box 22 and is arranged on inside control box 22, control circuit board 21 generally comprises power circuit, microprocessor, bus current testing circuit, inverter circuit and rotor position measurement circuit 14 (i.e. Hall element), power circuit is that each several part circuit is powered, rotor position measurement electric circuit inspection rotor-position signal is also input to microprocessor, the bus circuit of detection is input to microprocessor by bus current testing circuit, DC bus-bar voltage is input to microprocessor by busbar voltage testing circuit, Microprocessor S3C44B0X inverter circuit, inverter circuit controls the power on/off of each phase coil winding of stator module 12.

As shown in Figure 6, Figure 7, suppose that blower motor is 3 phase brushless direct current permanent magnetic synchronous motors, rotor position measurement circuit 14 generally adopts 3 Hall elements, 3 Hall elements detect the rotor-position in 360 degree of electrical angle cycles respectively, often turn over the energising that 120 degree of electrical angles change each phase coil winding of a stator module 12, form 3 phase 6 step control models.Exchange input (ACINPUT) to pass through by diode D7, D8, D9, after the full-wave rectifying circuit of D10 composition, DC bus-bar voltage Vbus is exported in one end of electric capacity C1, DC bus-bar voltage Vbus is relevant with input ac voltage, exchange input (ACINPUT) voltage determine after, the line voltage U P of 3 phase windings is PWM copped wave output voltages, UP=Vbus*w, w is the dutycycle that microprocessor is input to the pwm signal of inverter circuit, change line voltage U P and can change DC bus current Ibus, inverter circuit is by electronic switching tube Q1, Q2, Q3, Q4, Q5, Q6 forms, electronic switching tube Q1, Q2, Q3, Q4, Q5, the 6 road pwm signal (P1 that the control end of Q6 is exported by microprocessor respectively, P2, P3, P4, P5, P6) control, inverter circuit also contact resistance R1 for detecting bus current Ibus, bus current testing circuit is sent to microprocessor after being changed by the detection bus current Ibus of resistance R1.Power input to machine controls to be controlled by electronic switching tube Q7, and 1 road pwm signal--the i.e. P0 that microprocessor exports controls the ON time of electronic switching tube Q7, to control power input to machine.

As shown in Figure 8, the constant air capacity control of the blower motor direct Power Control in air-conditioning system, described blower motor drives wind wheel and has stator module, permanent magnet rotor component and electric machine controller, described electric machine controller comprises microprocessor, inverter circuit, rotor position measurement circuit, bus current testing circuit, busbar voltage testing circuit and power input to machine control circuit (not shown in FIG.), rotor position measurement electric circuit inspection rotor-position signal is also input to microprocessor, microprocessor calculates the real-time rotate speed n of motor according to rotor-position signal, bus current is input to microprocessor by bus current testing circuit, DC bus-bar voltage is input to microprocessor by busbar voltage testing circuit, Microprocessor S3C44B0X inverter circuit, inverter circuit controls the power on/off of each phase coil winding of stator module, Microprocessor S3C44B0X power input to machine control circuit, it is characterized in that: it comprises the steps:

Steps A) actuating motor controller, the target air volume value IN-CFM receiving or preset;

Step B) obtain corresponding function P=f (n) according to target air volume value IN-CFM, wherein n is rotating speed, and P is power input to a machine;

Step C) enter direct Power Control permanent wind amount control model: starter motor when control motor or motor speed are zero, makes it arrive a stable operating point (p along the control track of function P=f (n) _t, n _t); p _t, n _tbe be positioned at meet permanent wind amount control function P=f (n) track on a pair input power and rotating speed;

Step D) keep direct Power Control permanent wind amount control model: calculate the real-time input power Pi of motor according to motor operating parameter; Calculate Δ P=|Pt-Pi|;

Step e) if power increment value Δ P is less than setting value P _set, keep work on hand point;

Step F) if power increment value Δ P is more than or equal to setting value P _set; Whether the operating time of computational speed ring reaches by power/rotating speed control logic; If the operating time of speed ring does not reach, keep work on hand point;

Step G) if the operating time of speed ring reaches, admission velocity control loop presses Δ n=|ni-nt| governing speed, and ni is real-time rotate speed, realize the new operating point (Pi, ni) on track, even Pt=Pi, nt=ni, get back to step C.

Function P=f (n) described above described above obtains like this: first gather initial data, for several target air volume, be adjusted to high static pressure from low static pressure always, this static pressure wants the actual static pressure scope that can contain application, in the process of regulating static, motor is allowed to be in constant speed control, and by regulating motor speed n and the real-time input power Pi of motor to keep air quantity to be target air volume, and record motor steady-state speed the n now and real-time input power Pi of motor of correspondence, like this, for several target air volume, all create one group of rotating speed n and the real-time input power Pi of motor, then corresponding function P=f (n) of each target air volume in several target air volume is produced by the method for curve.

If outside input target air volume value IN-CFM described above is not equal to several target air volume of said determination one of them, can pass through interpolation method, the Fitting Calculation inputs corresponding function P=f (n) of target air volume value IN-CFM with any outside.Achieve the permanent Boiler pressure control of omnidistance arbitrary target air quantity.

Functional relation P=f (n) described above is polynomial function a: P=C ₁+ C ₂× n+...+C _m× n ^m-1, wherein C ₁, C ₂..., C _mbe coefficient, n is motor speed value, the corresponding one group of C of each target air volume ₁, C ₂..., C _mcoefficient also stores, and microprocessor obtains one group of corresponding C according to the target air volume value IN-CFM of input by look-up table or interpolation method ₁, C ₂..., C _mcoefficient, thus obtain functional relation P=f (n).

Stating described functional relation P=f (n) is second order function a: P=C ₁+ C ₂× n+C ₃× n ².

Control method (DirectPControlforConstantAirflowControlApparatusMethod) exploitation of direct Power Control permanent wind amount of the present invention and Mathematical Models are such: in general, a ventilating system, the stream air that the driving that blower fan is driven by blower motor produces a stable state.Constant Boiler pressure control, by speed, power control realization under a static pressure condition, is shown in following relational expression: CFM=F (P, speed, pressure), wherein CFM is air quantity, and P is power, speed is speed, and pressure is static pressure.When the change of static pressure, maintain this permanent wind amount with the control of power and speed.Along with static pressure increases, power and speed change thereupon.Cluster permanent wind amount CFM curve can test out, as shown in Figure 9.Based on these permanent wind amount CFM curve, exploitation Controlling model, when the requirement of control of product determination air quantity, provides a constant wind quantity CFM by control power and speed at specific static pressure.In fig .9, characteristic curve represent retentive control power and speed permanent wind amount physical characteristic, in the rated operating range of all motors, to the air-conditioning producer of the air flow system of the design of any type, based on test result and the rate curve of power, can reach a conclusion, a typical quadratic function can perform well in exploitation modeling as the typical function of one, P=C ₁+ C ₂× n+C ₃× n ², by three point to be located (A, B and C) of the person of choosing on curve, the data on the coordinate of its correspondence are (p1, n1), (p2, n2), and (p3, n3) obtains coefficient C1, C2, C3, see following formula:

$F(A,B,C)={\mathrm{\Σ}}_i^m{(\mathrm{Yi}-(C1+C2*n+C3*n^2))}^2,$ Pass through $\∂F/\∂A=0,\∂F/\∂B=0,$ And by solving equation, m=3.

The process of curve selects multinomial to describe curve, and polynomial coefficient can be obtained by least square method.P=C can be used in theory ₁+ C ₂× n+C ₃× n ²+ ...+Cm × n ^m-1, in fact select binomial just can meet general needs.Functional relation P=f (n) is second order function a: P=C ₁+ C ₂× n+C ₃× n ², wherein C ₁, C ₂and C ₃be coefficient, n is motor speed value, the corresponding one group of C of any one target air volume in several target air volume of test ₁, C ₂and C ₃coefficient also stores, and microprocessor obtains one group of corresponding C according to the target air volume value IN-CFM of input by look-up table ₁, C ₂and C ₃coefficient, thus obtain functional relation P=f (n), the corresponding one group of C of each target air volume in certain load ₁, C ₂and C ₃shown in coefficient table 1 specific as follows:

Table 1

Figure 10 is the fitting experimental data curve map of blower motor in the direct Power Control permanent wind amount of the air-conditioning system of small pipeline of 1/3HP, for a given target airflow, it is the use of founding mathematical models that some typical air quantity CFM of Systematic selection sets up a database as test point.These are typically put and comprise minimum and maximum quantity of wind value, and more additional intermediate points are according to product specification, and typical air quantity CFM has 5 as test point, is respectively 150/300/450/600 and 750CFM.

Table 2 shows an example of test data result.The scope of the rotating speed of motor is from 200 to 1400rpm; The static pressure of system is from 0.1 to 1H ₂o.Keep presetting permanent wind amount CCFM to export, obtain the power input to machine per unit value of a corresponding Figure 10, form a database.

Table 2

Utilize least square method, the quadratic function of the corresponding power of each predetermined CFM air quantity and rotating speed, obtains in the computational methods of a standard: power and the speed in the operating point of any system of a specific static pressure of the definition of these equations.When input setting air quantity IN-CFM presets, electric system defines a function corresponding with it, and the track of its operating point follows function definition.Equation (3) to (7) can be expressed as a normal equation, and C1, C2, C3 are constants.

$\mathrm{Power}\left(150\right)=0.3388{\left(\frac{n}{1000}\right)}^2-0.1551\left(\frac{n}{1000}\right)+0.0458---\left(3\right)$

$\mathrm{Power}\left(300\right)=0.4423{\left(\frac{n}{1000}\right)}^2-0.2113\left(\frac{n}{1000}\right)+0.0765---\left(4\right)$

$\mathrm{Power}\left(450\right)=0.3987{\left(\frac{n}{1000}\right)}^2-0.0308\left(\frac{n}{1000}\right)+0.0294---\left(5\right)$

$\mathrm{Power}\left(600\right)=0.2580{\left(\frac{n}{1000}\right)}^2+0.3983\left(\frac{n}{1000}\right)-0.1379---\left(6\right)$

$\mathrm{Power}\left(750\right)=0.1385{\left(\frac{n}{1000}\right)}^2+0.8150\left(\frac{n}{1000}\right)-0.3139---\left(7\right)$

Namely P=C is obtained ₁+ C ₂× n+C ₃× n ², equation (3) to (7) modeling curve provides the track of 5 selection operating points of several permanent wind amount CFM demand, and Power is power, and n is rotating speed.

As shown in figure 11, if request permanent wind amount IN-CFM require be not modeling curve one of them, use a kind of interpolation method to obtain the permanent wind amount IN-CFM of new this request of characteristic equation matching, such as when the permanent wind amount IN-CFM=525cfm of request requires received, adjacent two curve C FM1-600cfm and CFM2-450cfm modeling can identify.So latter two corresponding equation may be used for the new equation calculating IN-CFM=525cfm curve.Need-based IN-CFM=525cfm, three selected speed omega 1, ω 2, ω 3, determine to calculate performance number at these speedometers, utilize the speed that the equation that these two model curves are corresponding is being selected for two power points, linear weighted function interpolation can be used for calculating P value. first list matrix data as follows.

$\left[\begin{array}{c}{P}_i\\ P_1\left(600\right)\\ P_2\left(450\right)\end{array}\right]=\left[\begin{array}{ccc}{\mathrm{\ω}}_1& {\mathrm{\ω}}_2& {\mathrm{\ω}}_3\\ P_{11}& P_{12}& P_{13}\\ P_{21}& P_{22}& P_{23}\end{array}\right]$

For a pair power points (p _1i, p _2i) a corresponding selected speed omega, the corresponding 3 couples of power points (p of selected speed omega 1, ω 2, ω 3 _1i, p _2i), linear weighted function interpolation can be used for calculating Pi value for pi=p _2i+ w. (p _1i-p _2i).

Weighted value W calculates like this:

Note this CFM2≤IN-CFM≤CFM1, wait 0≤W≤1.Matrix equation is below computable,

$\left[\begin{array}{ccc}{\mathrm{\ω}}_1^2& {\mathrm{\ω}}_1& 1\\ {\mathrm{\ω}}_2^2& {\mathrm{\ω}}_2& 1\\ {\mathrm{\ω}}_3^2& {\mathrm{\ω}}_3& 1\end{array}\right]\left[\begin{array}{c}{C}_1\\ C_2\\ C_3\end{array}\right]=\left[\begin{array}{c}{P}_1\\ P_2\\ P_3\end{array}\right]$

The function P=C of the IN-CFM=525cfm of such correspondence ₁+ C ₂× n+C ₃× n ²can be obtained.Solve this matrix equation, can calculate C1, C2, C3 coefficient.Therefore, any demand input air quantity IN-CFM can obtain power equation.Because the microprocessor that this process is inside electric machine controller---single-chip microcomputer has initialized, so the calculating of power does not need to consume more real-time cpu resource.

Can find out, this direct Power Control DPC (DireetPowerControl) uses rotating speed to control to realize power and controls.The function of power/rotating speed control logic is that coordinating power/rotating speed loop time constant is to ensure the stability of system.Control can by controlling the accurate control of motor, and direct torque compares.No matter that in scalar or vector controlled, speeds control comparatively direct torque is more effective., improve control accuracy.

DPC controls to be carry out speeds control by the power of uniqueness and fans load speed characteristics.Motor is from zero rotating speed to high rotating speed, and power is also like this from zero to increase.The rotating speed of motor by rising until reach a pair operating point A (power, speed), it is static pressure force, as shown in figure 13, when static pressure increases suddenly, under speed control mode, motor provides more power (or larger moment of torsion) to keep speed, because higher static pressure needs very large power requirement.Power can rise to suddenly higher, and when electric system reaches " B " of a new operating point with identical speed, this algorithm will know that whether this is in constant CFM geometric locus operating point, thus determine a pair power/speed point " C ".But C point is not a stable operating point, due to high-power requirement, then removes " D " point, repeatedly, wait " G " that converge to a new stable operating point, terminate.

In force, we can reduce power swing when changing suddenly, control by using restricted power increment.In fig. 14, delta power can be designated as Δ P in its display.As long as changed power exceedes this power increment Δ P, speeds control will carry out speeds control.In this fashion, all operating points work under corresponding permanent wind amount CFM geometric locus positive and negative bandwidth.Distinguished and admirable control system in static pressure change transient process is stable.

As shown in figure 15, above-mentioned motor direct Power Control constant air capacity control and algorithm are tested on our blower motor controller, and all systematic functions meet requirement as shown in figure 15.

Figure 12 is that this algorithm controls the logic diagram of application at blower motor scalar, and input power is by DC bus-bar voltage, and Current calculation obtains. power and rotating speed will be limited in peak power P _max, and rotating speed n _maxwithin.

The real-time input power value Pi of motor is calculated by the DC bus current/voltage of feedback, so mate with power/speed data according to the air quantity IN-CFM of outside input, obtain the calculated value Pt of power input to machine, compare calculated value Pt and the real-time power output Pi of motor of power input to machine, obtain difference power Δ P, difference power Δ P is limited, and avoids difference power Δ P excessive, and regulating power fluctuation is larger.Difference power Δ P is exported by power/speed control logic, and carry out speed ring control, PWM frequency converter carries out rotating speed control. and adopt scalar to control, namely gather real-time bus current I _busthe real-time input power P=I of motor is calculated with real-time busbar voltage _bus× V _bus.

The principle of the air measuring of blower motor is as follows:

Theory analysis based on above: Figure 10 is the fitting experimental data curve map of blower motor in the direct Power Control permanent wind amount of the air-conditioning system of small pipeline of 1/3HP, air quantity CFM has 5 as test point, be respectively 150,300,450,600 and 750CFM, obtain equation (3) to (7), table 2 shows an example of test data result.The scope of the rotating speed of motor is from 200 to 1400rpm; The static pressure of system is from 0.1 to 1H ₂o, keeps presetting permanent wind amount CCFM and exports, obtain the power input to machine per unit value of a corresponding Figure 10.And the air quantity data of any one no longer above-mentioned 5 operating point of input are described, the function P=C of such as IN-CFM=525cfm ₁+ C ₂× n+C ₃× n ²can be obtained.Solving matrix equation, can calculate C1, C2, C3 coefficient.Therefore, any demand input air quantity IN-CFM can obtain power equation.Namely target air volume of any one input can obtain should the permanent wind amount control function P=C of target air volume ₁+ C ₂× n+C ₃× n ².

Backward reasoning according to above principle: that is petty, when machine operation under steady state conditions, measure current realtime power Po and the rotating speed no of motor, as shown in figure 16, by this M ((Po, no), we can extrapolate this point (Po, no) be on the curve C FM0 of that permanent Boiler pressure control, also just know the airflow value that this M (Po, no) is corresponding.Its derivation is as follows:

It is between those two known generator volume curve.We substitute into equation (3) to (7) P0, obtain the rotating speed n (150) that 5 kinds of air quantity are corresponding, n (300), n (450), n (600), n (750), be between those two known permanent wind discharge curves by rotating speed multilevel iudge rotating speed no, suppose this M (Po, no) be between permanent wind discharge curve CFM1 and CFM2, under input power equals Po situation, the rotating speed that permanent wind discharge curve CFM1 and CFM2 is corresponding is respectively n1, n2, this M (Po, no) permanent wind value CFM0=CFM2+ (CFM1-CFM2) × (n2-no) ÷ (n2-n1), wherein CFM1, CFM2 is air quantity 150, n (300), 450, 600, one in 750.Derive from above, the realtime power Po of known motor and rotating speed no, the just known airflow value CFM0 obtaining air-conditioning system and export, when detecting the deviation of air quantity lower than setting air quantity and reaching certain value, be judged as that airstrainer blocks and outputs signal warning.

Embodiment two: a kind of air cleaning machine, as shown in figure 17, comprise casing 100, air cleaning member 106 is installed inside casing 100, blower motor 101, wind wheel or wind wheel 102 and airstrainer 103, air channel is provided with in casing 100, air channel arranges air inlet 104 and air outlet 105, airstrainer 103 and wind wheel 102 are installed inside air channel, blower motor drives fan or wind wheel 102 to rotate to make air to enter air channel and through the purified treatment of airstrainer 103 and air cleaning member 106 from air inlet 1104, then export from air outlet 105, or described blower motor 101 adopts BLDC motor ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, utilize blower motor as the element detecting air quantity, when detecting the deviation of air quantity with setting air quantity and reaching certain value, be judged as that airstrainer blocks and reports to the police.Air cleaning member 106 can be uviol lamp or anion generator.Blower motor is operated in the control model of permanent wind amount, and first microprocessor is measured actual power and whether arrived rated power, if measure actual power to reach rated power, then judges to detect air quantity and the deviation setting air quantity.When detecting the setting air quantity of air quantity lower than 90%, be judged as that airstrainer blocks.When detecting the deviation of air quantity with setting air quantity and reaching certain value, Microprocessor S3C44B0X warning circuit is reported to the police, and the blocking of prompting airstrainer, warning circuit can be audible alarm circuit, or photoelectric alarm circuit, and warning circuit layout is inside electric machine controller.

Embodiment three:

A kind of air-conditioning system, comprise body, inside body, compressor is installed, heat exchanger, blower motor, wind wheel, airstrainer and air-conditioning system master control wiring board, air channel is provided with in body, air channel arranges air inlet and air outlet, airstrainer and wind wheel are installed inside air channel, blower motor drives wind wheel to rotate, or described blower motor adopts BLDC motor ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, air-conditioning system master control wiring board is electrically connected with electric machine controller, it is characterized in that: utilize blower motor as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks, air-conditioning system can be split air conditioner air-conditioning, floor standing air-conditioner, window-mounted air conditioner, multi-gang air-conditioner, air-cooled ducted air conditioner air-conditioning, commercial coiler air-conditioning, courtyard air conditioner.

Can set when detecting the setting air quantity of air quantity lower than 90%, be judged as that airstrainer blocks, air-conditioning system master control wiring board is to blower motor input setting air quantity, microprocessor detects air quantity in real time, when detecting the deviation of air quantity with setting air quantity and reaching certain value, Microprocessor S3C44B0X warning circuit is reported to the police, the blocking of prompting airstrainer, warning circuit can be audible alarm circuit, or photoelectric alarm circuit, warning circuit can layout at air-conditioning system master control wiring board, also can layout inside electric machine controller, warning circuit can comprise the original liquid crystal display of air-conditioning system, alarm signal is first sent to air-conditioning system master control wiring board by microprocessor, air-conditioning system master control wiring board outputs signal liquid crystal display, word or pattern is utilized to block to point out airstrainer.Blower motor is operated in permanent wind amount control model, first microprocessor is measured actual power and whether is arrived rated power, if measure actual power to reach rated power, judge again to detect air quantity and the deviation setting air quantity, blower motor can be operated in permanent wind amount control model, and first whether microprocessor measured actual power and arrived in rated power, if measure actual power to reach rated power, and detect air quantity with setting air quantity deviation reach certain value time, report to the police; When detecting that air quantity has deviation in allowed band with setting air quantity, select not report to the police.Blower motor can be operated in constant moment of force control model, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.Blower motor can be operated in constant speed control pattern, when detecting the deviation of air quantity with setting air quantity and reaching certain value, is judged as that airstrainer blocks and reports to the police.

Claims (16)

1. the filter net jam detection method of a blowing device, described blowing device comprises air inlet, air outlet, air channel, fan or wind wheel, blower motor and airstrainer, airstrainer is arranged on air channel, blower motor drives fan or wind wheel to rotate to make air to enter air channel and through airstrainer from air inlet, then export from air outlet, it is characterized in that: utilize blower motor as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks and outputs signal warning, described blower motor adopts BLDC motor or ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, microprocessor arranges the function of Wind Coverage Calculation, the relating to parameters of the real time execution of the actual measurement air quantity that air quantity function calculates and motor.

2. the filter net jam detection method of a kind of blowing device according to claim 1, it is characterized in that: described blowing device is split air conditioner air-conditioning, or floor standing air-conditioner, or window-mounted air conditioner, or multi-gang air-conditioner, or air-cooled ducted air conditioner air-conditioning, or commercial coiler air-conditioning, or courtyard air conditioner, or HVAC system, or air cleaner, or air purifier.

3. the filter net jam detection method of a kind of blowing device according to claim 1, is characterized in that: the function Q=F (POWER, n) of Wind Coverage Calculation, and wherein POWER is power input to a machine, and n is the rotating speed of motor.

4. the filter net jam detection method of a kind of blowing device according to claim 1 and 2, it is characterized in that: blower motor is operated in permanent wind amount control model, first whether microprocessor measured actual power and arrived in rated power, if measure actual power to reach rated power, and detect air quantity with setting air quantity deviation reach certain value time, report to the police; When detecting that air quantity has deviation in allowed band with setting air quantity, select not report to the police.

5. the filter net jam detection method of a kind of blowing device according to claim 1 and 2, it is characterized in that: blower motor is operated in constant moment of force control model, when detecting the deviation of air quantity with setting air quantity and reaching certain value, be judged as that airstrainer blocks and reports to the police.

6. the filter net jam detection method of a kind of blowing device according to claim 1 and 2, it is characterized in that: blower motor is operated in constant speed control pattern, when detecting the deviation of air quantity with setting air quantity and reaching certain value, be judged as that airstrainer blocks and reports to the police.

7. a blowing device, comprise body, air channel is provided with in body, inside body, blower motor is installed, wind wheel, airstrainer, air channel arranges air inlet and air outlet, airstrainer and wind wheel are installed inside air channel, blower motor drives wind wheel to rotate, described blower motor adopts BLDC motor or ECM motor, comprise motor monomer and electric machine controller, described motor monomer comprises rotating shaft, permanent magnet rotor component, stator module and case component, permanent magnet rotor component and stator module form magnetic lotus root and close, stator module comprises stator core and is wound on coil windings on stator core, described electric machine controller includes microprocessor, inverter circuit and operational parameter detection circuit, the output of inverter circuit is connected with coil windings, the signal of detection is input to microprocessor by operational parameter detection circuit, the output of microprocessor controls inverter circuit, it is characterized in that: blower motor input setting air quantity, blower motor is as the element detecting air quantity, when detecting air quantity lower than setting air quantity, be judged as that airstrainer blocks.

8. blowing device according to claim 7, it is characterized in that: blowing device is split air conditioner air-conditioning, or floor standing air-conditioner, or window-mounted air conditioner, or multi-gang air-conditioner, or air-cooled ducted air conditioner air-conditioning, or commercial coiler air-conditioning, or courtyard air conditioner, or HVAC system, or air cleaner, or air purifier.

9. a kind of blowing device according to claim 7 or 8, is characterized in that: when detection air quantity Q1 is lower than factory set value, be judged as that airstrainer blocks.

10. a kind of blowing device according to claim 7 or 8, it is characterized in that: blowing device is with device controller, device controller is to blower motor input setting air quantity, microprocessor detects air quantity in real time, when detecting the deviation of air quantity with setting air quantity and reaching certain value, Microprocessor S3C44B0X warning circuit is reported to the police, the blocking of prompting airstrainer.

11. a kind of blowing devices according to claim 10, is characterized in that: warning circuit is audible alarm circuit, or photoelectric alarm circuit.

12. a kind of blowing devices according to claim 11, is characterized in that: warning circuit layout at device controller, also can layout inside electric machine controller.

13. a kind of blowing devices according to claim 12, it is characterized in that: warning circuit comprises the original liquid crystal display of blowing device, alarm signal is first sent to device controller by microprocessor, device controller outputs signal liquid crystal display, utilizes word or pattern to block to point out airstrainer.

14. a kind of blowing devices according to claim 7 or 8, is characterized in that: blower motor is operated in permanent wind amount control model, and detect air quantity when reaching certain value with the deviation of setting air quantity, report to the police; When detecting that air quantity has deviation in allowed band with setting air quantity, select not report to the police.

15. a kind of blowing devices according to claim 7 or 8, is characterized in that: blower motor is operated in constant speed control pattern, when detecting the deviation of air quantity with setting air quantity and reaching certain value, are judged as that airstrainer blocks and reports to the police.

16. a kind of blowing devices according to claim 7 or 8, is characterized in that: blower motor is operated in constant moment of force control model, when detecting the deviation of air quantity with setting air quantity and reaching certain value, are judged as that airstrainer blocks and reports to the police.