CN207198185U - A kind of Novel DC brush motor Rotating speed measring circuit - Google Patents
A kind of Novel DC brush motor Rotating speed measring circuit Download PDFInfo
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- CN207198185U CN207198185U CN201721140494.9U CN201721140494U CN207198185U CN 207198185 U CN207198185 U CN 207198185U CN 201721140494 U CN201721140494 U CN 201721140494U CN 207198185 U CN207198185 U CN 207198185U
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Abstract
It the utility model is related to detection field of circuit technology, and in particular to a kind of Novel DC brush motor Rotating speed measring circuit, it includes：The operating voltage to connect with the positive pole of motor, operating voltage pass sequentially through first, 3rd resistor and are connected with the end in the same direction of operational amplifier；The negative pole of motor is grounded after passing sequentially through the four, the 6th resistance, and one end of second resistance is connected between first, 3rd resistor, and its other end is connected between electrode negative and the 4th resistance；The input of 6th resistance is connected with the backward end of operational amplifier, is connected between 3rd resistor and the end in the same direction with one end of the 5th resistance, the other end ground connection of the 5th resistance；The output end of operational amplifier is exported by the 8th resistance, and the 7th resistance the utility model is connected between its output end and backward end effectively the rotating speed of motor is detected, and control effect is obvious, and reliability is high, and cost is cheap；And its circuit structure is relatively stable, time delay is shorter, beneficial to promoting on the market.
Description
Technical field
It the utility model is related to detection field of circuit technology, and in particular to a kind of Novel DC brush motor Rotating speed measring electricity
Road.
Background technology
Brush direct current motor starts the performance characteristics such as fast, braking is timely, control circuit is relatively easy because its own has,
Therefore it is widely used in all trades and professions；The brush control that has on the market is all to use opened loop control at present, and its speed can not
Detected；And for some product requirement constant speed controls, must be requested that detect rotating speed, all use and pacify inside motor
The mode of dress Hall is detected, but the cost of this detection mode is higher, complex process, and its reliability is not high, is unfavorable for
Promoted on the market.
The content of the invention
To overcome drawbacks described above, the purpose of this utility model is to provide a kind of Novel DC brush motor Rotating speed measring
Circuit.
The purpose of this utility model is achieved through the following technical solutions：
The utility model is a kind of Novel DC brush motor Rotating speed measring circuit, and it is connected with brush direct current motor,
Including：The operating voltage being connected with the positive pole of the brush direct current motor, the operating voltage pass sequentially through first resistor and
Three resistance are connected with the input in the same direction of operational amplifier；The negative pole of the brush direct current motor pass sequentially through the 4th resistance and
Be grounded after 6th resistance, and one end of second resistance be connected between the first resistor and 3rd resistor, the second resistance it is another
One end is connected between the negative pole of brush direct current motor and the 4th resistance；The input of 6th resistance also with operation amplifier
The reverse input end of device is connected, one end between the 3rd resistor and the input in the same direction of operational amplifier with the 5th resistance
It is connected, and the other end ground connection of the 5th resistance；The output end of the operational amplifier passes through the 8th resistance and circuit output
End connects, and the 7th resistance is connected between the output end of the operational amplifier and its reverse input end；8th resistance with
One end of the 5th electric capacity, the other end ground connection of the 5th electric capacity are connected between circuit output end；The operational amplifier is just
Power end connects with supply voltage, and its negative power end is grounded；The supply voltage after the 4th electric capacity by being grounded.
Further, the first diode being in parallel and the first electricity are provided between the positive pole and negative pole of the brush direct current motor
Hold, the positive pole of first diode is connected with the negative pole of brush direct current motor, the negative pole and direct current of first diode
The positive pole of brush motor is connected.
Further, it is connected with the 3rd electric capacity between the input of the 3rd resistor and the 4th resistance.
The utility model can be detected effectively to the rotating speed of brush direct current motor, and it is to requiring that constant speed control produces
The control effect of product is obvious, and reliability is high, and cost is cheap；And its circuit structure is relatively stable, counter electromotive force caused by motor
Time delay it is shorter, beneficial to being promoted on the market.
Brief description of the drawings
For ease of explanation, the utility model is described in detail by following preferred embodiments and accompanying drawing.
Fig. 1 is overall structure diagram of the present utility model.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further described.It should be appreciated that specific embodiment described herein is only explaining this reality
With new, it is not used to limit the utility model.
Referring to Fig. 1, the utility model is a kind of Novel DC brush motor Rotating speed measring circuit, itself and DC brush are electric
Machine M is connected, including：The operating voltage VDD being connected with brush direct current motor M positive pole, the operating voltage VDD is successively
It is connected by first resistor R1 and 3rd resistor R3 with operational amplifier IC1 input in the same direction；The brush direct current motor M
Negative pole pass sequentially through the 4th resistance R4 and the 6th resistance R6 after be grounded, and be connected between first resistor R1 and 3rd resistor R3
Second resistance R2 one end, the other end of the second resistance R2 are connected to brush direct current motor M negative pole and the 4th resistance
Between R4；Reverse input end of the input of the 6th resistance R6 also with operational amplifier IC1 is connected, the 3rd resistor
It is connected between R3 and operational amplifier IC1 input in the same direction with the 5th resistance R5 one end, and the 5th resistance R5's is another
One end is grounded；The output end of the operational amplifier IC1 is connected by the 8th resistance R8 with circuit output end, the circuit output
End is connected with Micro-processor MCV, and the 7th electricity is connected between the output end of the operational amplifier IC1 and its reverse input end
Hinder R7；The 5th electric capacity C5 one end is connected between the 8th resistance R8 and circuit output end, the 5th electric capacity C5's is another
End ground connection；The positive power source terminal of the operational amplifier IC1 connects with supply voltage VCC, and its negative power end is grounded；The power supply
Voltage VCC after the 4th electric capacity C4 by being grounded.
Further, the first diode D1 for being in parallel and the is provided between the positive pole and negative pole of the brush direct current motor M
One electric capacity C1, the positive pole of the first diode D1 are connected with brush direct current motor M negative pole, the first diode D1's
Negative pole is connected with brush direct current motor M positive pole.
Further, it is connected with the 3rd electric capacity C3 between the input of the 3rd resistor R3 and the 4th resistance R4.
Wherein, when the first diode D1 turns off for control carrier wave, the counter electromotive force afterflow at motor both ends；First resistor R1,
Second resistance R2 is counter electromotive force divider resistance, and based on dividing ratios are come by MCU AD voltages, the maximum of partial pressure is less than AD
The voltage of mouth；3rd electric capacity C3 is for filter capacitor；3rd resistor R3, the 4th resistance R4 are the anti-interference resistance of difference；5th
Resistance R5, the 6th resistance R6 are differential resistor；7th resistance R7 is feedback resistance, and resistance needs to be calculated according to actual conditions；
And the 8th resistance R8 and the 5th electric capacity C5 composition capacitance-resistances loop.
Operation principle of the present utility model is specially：
Motor is in rotary course, and magnet cutting magnetic line can produce counter electromotive force, and rotating speed is higher, and counter electromotive force is then got over
Greatly, the rotating speed of motor and the proportional relation of itself counter electromotive force, therefore, the utility model utilizes this relation, according to anti-electronic
The actual speed of the amplitude estimation motor of gesture.DC brush system is after motor speed signal feedback is obtained, you can enters scanning frequency
Spend closed-loop control.And counter electromotive force calculation formula is：
E = Ke * n;
Wherein, E is counter electromotive force, and Ke is back electromotive force constant, and n is motor speed.
Then have：
n = E / Ke;
It follows that to obtain rotating speed, it is only necessary to know the counter electromotive force E and back electromotive force constant Ke of motor；And anti-electricity
Kinetic potential constant Ke amplitude size will provide this parameter by motor body structures shape, during Motor Production Test.
And counter electromotive force E Cleaning Principle is then：In brushed DC motor during PWM carrier Controls, PWM carrier waves exist
During shut-off, motor both ends can produce counter electromotive force, can be by detection circuit of the present utility model to the anti-electronic of motor both ends
Gesture signal is detected.Back-emf signal is after the first electric capacity C1 filtering, and the first electricity electricity of group R1 and second group R2 is to anti-electricity
Kinetic potential carries out partial pressure, and then voltage carries out anti-interference process by the three, the four, the five, the 6th resistance R3, R4, R5, R6,
By operational amplifier IC1 enhanced processing, MO_Voltage signals are exported, and the MO_Voltage signals are given to microprocessor
Device MCU；This analog quantity is changed into digital quantity by MCU again, system software algorithm computing is participated in, is scaled rate signal.
The utility model includes：Differential voltage sampling section, signal filtering part, signal amplifying part point.Differential voltage is adopted
Sample part:For motor in speed regulating control, caused back-emf voltage passes through the 3rd electricity after first, second electric resistance partial pressure
Choked flow enters the end in the same direction of operational amplifier；The negative pole of motor is grounded after leading to the four, the 6th resistance successively.Signal amplifying part point：Through
The combination of the six, the seven resistance is crossed, signal is amplified, it is defeated by the progress of the 8th resistance by the output end of operational amplifier
Go out, and the 7th resistance is connected between its output end and backward end.Signal filtering part：Firstth, the three, the 5th electric capacity enter to signal
Row filtering, the first electric capacity connect motor both ends, and the 3rd electric capacity connects 3rd resistor front end, and the 5th electric capacity connects the rear end of the 8th resistance.
The utility model is because the component cost selected by whole circuit is cheap, all using common conventional device, but
Special Hall detection function is realized, therefore it reduces cost while ensure that circuit performance, its economic benefit very may be used
See；Secondly, the versatility of the utility model circuit and ageing relatively good, reliability height；Also, due to selected by the utility model
Device and material are all general part, and the industrialization of circuit is easily achieved, and circuit uniformity is fine, have the meaning promoted.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of Novel DC brush motor Rotating speed measring circuit, it is connected with brush direct current motor, it is characterised in that bag
Include：The operating voltage being connected with the positive pole of the brush direct current motor, the operating voltage pass sequentially through first resistor and the 3rd
Resistance is connected with the input in the same direction of operational amplifier；The negative pole of the brush direct current motor passes sequentially through the 4th resistance and
Be grounded after six resistance, and one end of second resistance be connected between the first resistor and 3rd resistor, the second resistance it is another
End is connected between the negative pole of brush direct current motor and the 4th resistance；The input of 6th resistance also with operational amplifier
Reverse input end be connected, one end phase between the 3rd resistor and the input in the same direction of operational amplifier with the 5th resistance
Connection, and the other end ground connection of the 5th resistance；The output end of the operational amplifier passes through the 8th resistance and circuit output end
Connect, and the 7th resistance is connected between the output end of the operational amplifier and its reverse input end；8th resistance and electricity
One end of the 5th electric capacity, the other end ground connection of the 5th electric capacity are connected between the output end of road；The positive electricity of the operational amplifier
Source connects with supply voltage, and its negative power end is grounded；The supply voltage after the 4th electric capacity by being grounded.
2. Novel DC brush motor Rotating speed measring circuit according to claim 1, it is characterised in that the DC brush
Be provided with the first diode and the first electric capacity that are in parallel between the positive pole and negative pole of motor, the positive pole of first diode with it is straight
The negative pole of stream brush motor is connected, and the negative pole of first diode is connected with the positive pole of brush direct current motor.
3. Novel DC brush motor Rotating speed measring circuit according to claim 2, it is characterised in that the 3rd resistor
The 3rd electric capacity is connected between the input of the 4th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721140494.9U CN207198185U (en) | 2017-09-07 | 2017-09-07 | A kind of Novel DC brush motor Rotating speed measring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721140494.9U CN207198185U (en) | 2017-09-07 | 2017-09-07 | A kind of Novel DC brush motor Rotating speed measring circuit |
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| Publication Number | Publication Date |
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| CN207198185U true CN207198185U (en) | 2018-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721140494.9U Active CN207198185U (en) | 2017-09-07 | 2017-09-07 | A kind of Novel DC brush motor Rotating speed measring circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285374A (en) * | 2020-10-28 | 2021-01-29 | 深圳市朗科智能电气股份有限公司 | Brush motor speed detection device and brush motor speed detection method |
| CN113219200A (en) * | 2021-05-24 | 2021-08-06 | 山东交通学院 | Speed measuring method for direct current brush motor |
| CN115184636A (en) * | 2022-05-27 | 2022-10-14 | 宁波赛福汽车制动有限公司 | Direct current motor rotating speed real-time estimation circuit and method |
-
2017
- 2017-09-07 CN CN201721140494.9U patent/CN207198185U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285374A (en) * | 2020-10-28 | 2021-01-29 | 深圳市朗科智能电气股份有限公司 | Brush motor speed detection device and brush motor speed detection method |
| CN113219200A (en) * | 2021-05-24 | 2021-08-06 | 山东交通学院 | Speed measuring method for direct current brush motor |
| CN115184636A (en) * | 2022-05-27 | 2022-10-14 | 宁波赛福汽车制动有限公司 | Direct current motor rotating speed real-time estimation circuit and method |
| CN115184636B (en) * | 2022-05-27 | 2023-11-24 | 宁波赛福汽车制动有限公司 | DC motor rotating speed real-time estimation circuit and method |
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