JP4224738B2 - Brushless motor control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brushless motor control apparatus, and more particularly to a brushless motor control apparatus that enables motor acceleration and deceleration control using a motor delay circuit.
[0002]
[Prior art]
A three-phase brushless motor is used as a spindle motor of a hard disk drive, and a motor delay circuit generally composed of a microcomputer is used as a control device for controlling the rotation of the three-phase brushless motor.
Conventionally, in a motor delay circuit used in such a control device for a three-phase brushless motor, a back electromotive voltage of each phase of the three-phase brushless motor is detected through a comparator, and a signal of each phase detected by the comparator is detected as a motor delay. By inputting to the circuit, an output signal of each phase obtained by delaying a predetermined phase (for example, 30 °) with respect to the input signal is extracted from the motor delay circuit. Thereafter, the output signal of each phase is converted into a signal for controlling on / off of the switching element of each phase of the brushless motor by the converter, and then the switching element of each phase is controlled on / off by this switching signal. A rotating magnetic field is generated by passing a driving current through a phase coil, and thereby the rotor is rotated to control the hard disk or the like to a constant angular velocity (constant linear velocity).
[0003]
[Problems to be solved by the invention]
In the motor delay circuit used in the conventional brushless motor control apparatus as described above, the acceleration control of the brushless motor can be performed relatively easily under the control of the microcomputer, but the deceleration control only by the microcomputer is impossible. It is.
Therefore, in the conventional deceleration control of a brushless motor, a hardware element such as temporarily stopping the voltage supplied to each phase coil is added, and the deceleration control is performed using this hardware element. ing.
However, such a conventional control method cannot perform optimum acceleration / deceleration control according to the load fluctuation, voltage fluctuation, disturbance, etc. of the brushless motor, although it is controlled using a microcomputer. There's a problem.
[0004]
The present invention has been made in view of the above points, and an object of the present invention is to enable acceleration and deceleration control of a brushless motor using a motor delay circuit and to perform optimal motor control according to the motor status. It is an object of the present invention to provide a brushless motor control device that makes it possible.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is provided with a stator formed by connecting a plurality of coils arranged at equal intervals in the circumferential direction to a plurality of phases, and rotatably arranged opposite to the coils of the stator. A rotor composed of magnets magnetized on a plurality of poles corresponding to each phase; and a switching element for each phase that controls on and off of a current supplied to each coil of each phase. A control device for a brushless motor that rotates a rotor by generating a rotating magnetic field by controlling the on / off of the switching element to flow a driving current through the coil of each phase, and is induced in the coil of each phase. Comparing the counter electromotive voltage and the reference value to extract a voltage exceeding the reference value as a delay input signal, and sampling the extracted delay input signal of each phase. A sampling circuit for each phase that outputs a signal similar to the delay input signal, and an edge detection circuit for each phase that detects a rising edge and a falling edge of each signal output from the sampling circuit of each phase Provided for each edge detection circuit of each phase, and one of the rising edge signal and the falling edge signal of the signal detected by each edge detection circuit is selected according to the acceleration or deceleration control processing, and A selector for each phase that is output as a motor delay interrupt request signal, and a signal pattern is switched from acceleration to deceleration based on the motor delay interrupt request signal for each phase, and motor deceleration control processing is executed, or the signal pattern is changed from deceleration From the interrupt control means that executes acceleration control processing of the motor by switching to acceleration, and the sampling circuit of each phase A delay circuit for each phase that delays each input phase signal for a predetermined time and outputs it as a delay output signal for each phase, and each delay output signal output from the delay circuit for each phase performs the interrupt control. Select circuit for selecting and outputting according to the deceleration control process or acceleration control process of the means, and each delay output signal selected and output from the select circuit is not inverted according to the deceleration control process or the acceleration control process of the interrupt control means An inversion / non-inversion switching circuit that outputs the signal as it is or inversion, and a signal for turning on / off the switching element of each phase based on each delay output signal output from the inversion / non-inversion switching circuit of each phase And a logic conversion means for outputting to each switching element.
[0006]
According to the present invention, acceleration and deceleration control of a brushless motor can be performed using a motor delay circuit, and optimal motor control according to the motor condition can be performed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a brushless motor control device according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a three-phase brushless motor and its control device in an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a motor delay circuit in the embodiment of the present invention, and FIG. FIG. 4 is an explanatory view of a brushless motor in a state where the rotor and the stator shown in FIG. 3 are combined.
[0008]
First, the configuration of the three-phase brushless motor will be described with reference to FIGS. 3 and 4. 3 and 4, the three-phase brushless motor 10 includes a rotor 11 having N poles and S poles alternately magnetized at equal intervals in the circumferential direction, and rotation of the rotor 11 on the substrate 121. The stator 12 includes six coils 122 arranged at equal intervals in the circumferential direction around the shaft 111.
Among the coils 122 of the stator 12, two coils facing each other across the central axis of the substrate 121 are connected in series to form A, B, and C3 phase coils LA, LB, and LC. The coils LA, LB, LC of each phase are connected in a star shape. Then, terminals 13A, 13B, and 13C are connected to one ends of the coils LA, LB, and LC of each phase, respectively, and the other ends of the coils LA, LB, and LC of each phase are commonly connected to the neutral point 13D. ing.
As shown in FIG. 1, the terminal 13A of the coil LA is connected to the positive and negative electrodes of the variable voltage source 14 via the switching elements SW-AH and SW-AL, and the terminal 13B of the coil LB is connected to the switching element SW-BH. The terminal 13C of the coil LC is connected to the positive and negative electrodes of the variable voltage source 14 via the switching elements SW-CH and SW-CL. ing.
[0009]
Next, the configuration of the brushless motor control device that controls the three-phase brushless motor 10 will be described with reference to FIGS. 1 and 2.
In FIG. 1, the brushless motor control device includes a comparator 20, a motor delay circuit 30, and a logic converter 40.
The comparator 30 generates back electromotive voltages VA, VB, VC (see FIG. 5) and reference values (neutral point potentials) induced in the coils LA, LB, LC of each phase as the three-phase brushless motor 10 rotates. In comparison, a voltage exceeding a reference value is extracted for each phase as delay input signals Va, Vb, Vc (see FIG. 5), and the delay input signals Va, Vb, Vc is output to the motor delay circuit 30.
The logic converter 40 converts the delay output signals VDa, VDb, and VDc (see FIG. 5) output from the motor delay circuit 30 to the switching elements SW-AH and SW-AL, the switching elements SW-BH and SW-BL, and the switching elements. The signals are converted into signals for turning on and off SW-CH and SW-CL (see FIG. 5) and output to the respective switching elements.
[0010]
The motor delay circuit 30 generates delay output signals VDa, VDb, and VDc obtained by delaying the delay input signals Va, Vb, and Vc by a delay time corresponding to, for example, a phase difference of 30 °, and enables motor acceleration control and deceleration control. It consists of a microcomputer.
As shown in FIG. 2, the motor delay circuit 30 samples the delay input signals Va, Vb, Vc from the comparator 20 and samples signals Va ′, Vb ′, Vc similar to the delay input signals Va, Vb, Vc, respectively. Sampling circuit 301A, 301B, 301C which outputs'.
Each of the sampling circuits 301A, 301B, and 301C includes, for example, an AND gate having two inputs of a sampling clock signal obtained by dividing a 1/4 MHz main clock MCK by 1/4 and signals PA, PB, and PC that select sampling. GA, GB, and GC are connected to each other.
[0011]
The motor delay circuit 30 includes edge detection circuits 302A, 302B, and 302C that detect rising edges and falling edges of the respective signals Va ′, Vb ′, and Vc ′ output from the sampling circuits 301A, 301B, and 301C. , Detected by the edge detection circuits 302A, 302B, and 302C and the edge detection circuits 302A, 302B, and 302C that send edge falling signals of the signals Va ′, Vb ′, and Vc ′ detected by the edge detection circuits 302A, 302B, and 302C. Edge rising edges of the signals Va ′, Vb ′, Vc ′ detected by the circuits 303A2, 303B2, 303C2 and the edge detection circuits 302A, 302B, 302C2 that send edge rising signals of the signals Va ′, Vb ′, Vc ′. Circuits 303A3 and 303 for sending a falling signal 3, 303C3, selector 304A that selects one of circuits 303A1, 303A2, and 303A3 and outputs it as an A-phase motor delay interrupt request signal SA, and selects one of circuits 303B1, 303B2, and 303B3 A selector 304B that outputs as a motor delay interrupt request signal SB and a selector 304C that selects one of the circuits 303C1, 303C2, and 303C3 and outputs it as a C-phase motor delay interrupt request signal SC are provided.
[0012]
Further, the motor delay circuit 30 includes latch circuits 305A, 305B, and 305C that latch the signals Va ′, Vb ′, and Vc ′ output from the sampling circuits 301A, 301B, and 301C, and the latch circuits 305A, 305B, and 305C, respectively. D-flip-flops 306A, 306B, and 306C that output the delayed signals VaD, VDb, and VDc as delay output signals VDa, VDb, and VDc, respectively, by delaying the signals Va ′, Vb ′, and Vc ′ latched in FIG. A select circuit 307 for selecting and transmitting the delay output signals VDa, VDb, and VDc output from the D flip-flops 306A, 306B, and 306C, and the delay output signals VDa and VDb selected and output from the select circuit 307. , VDc remains non-inverted Or comprising inverted and sends the inversion / non-inversion switching circuit 308A, 308B, and 308C.
The latch circuits 305A, 305B, and 305C and the D-flip flops 306A, 306B, and 306C constitute a delay circuit.
[0013]
Reference numeral 309 denotes a mask counter for masking periods other than the edge portions of the signals Va ′, Vb ′, and Vc ′ output from the sampling circuits 301A, 301B, and 301C. The mask counter 309 is, for example, 16 MHz. The up-flow signal UFM is input as an edge detection start signal to the edge detection circuits 302A, 302B, and 302C. The 8-bit counter uses a signal obtained by dividing the main clock MCK by 1/256. Reference numeral 310 denotes an 8-bit mask register for setting the count contents of the mask counter 309.
Reference numeral 311 denotes a delay counter for delaying the delay output signals VDa, VDb, and VDc output from the D flip-flops 306A, 306B, and 306C for a predetermined time from the delay input signals Va, Vb, and Vc. Is composed of an 8-bit counter that uses a signal obtained by dividing the 16 MHz main clock MCK by 1/512, for example, and the upflow signal UFD is input to the D flip-flops 306A, 306B, and 306C as a delay clock. . Reference numeral 312 denotes an 8-bit delay register for setting the count contents of the delay counter 311.
[0014]
The output signal of the OR gate 313 taking the logical sum of the edge detection signals from the circuits 303A3, 303B3 and 303C3 is applied as a load signal LD to the mask counter 309 via the OR gate 314, whereby the delay input mask register 310 The contents set in (1) are preset in the mask counter 309. The upflow signal UFD of the delay counter 311 is also inputted as a preset signal to the mask counter 309 via the OR gate 314.
Further, the output signal of the OR gate 313 is added as a load signal LD to the delay counter 311, whereby the content set in the delay register 312 is preset in the delay counter 311. The output signal of the OR gate 313 is applied as a gate signal to the latch circuits 305A, 305B, and 305C.
[0015]
In FIG. 2, reference numeral 315 denotes an A-phase edge time measuring means for measuring a time between edges corresponding to one cycle = 1/4 rotation of the delay input signal Va based on the A-phase motor delay interrupt request signal SA. Reference numeral 316 denotes a B-phase inter-edge time measuring means for measuring a time between edges corresponding to one cycle = 1/4 rotation of the delay input signal Vb based on the B-phase motor delay interrupt request signal SB. This is a C-phase inter-edge time measuring means for measuring the time between edges corresponding to one cycle = 1/4 rotation of the delay input signal Vb based on the C-phase motor delay interrupt request signal SC.
Reference numeral 318 denotes an arithmetic unit that calculates a mask time and a delay time based on the measurement values measured by the edge-to-edge time measuring units 315, 316, and 317 of the A, B, and C phases. The mask time data thus set is set in the mask register 310. Further, the delay time data calculated by the calculation means 318 is set in the delay register 312.
[0016]
Based on the motor delay interrupt request signals SA, SB, and SC of each phase, 319 executes a motor deceleration control process by switching the signal pattern from acceleration to deceleration, or performs a motor acceleration control by switching the signal pattern from deceleration to acceleration. This interrupt control means 319 executes processing or the like. The interrupt control means 319 receives the motor delay interrupt request signals SA, SB, SC, and receives selection signals DIEG0, 1 for the selectors 304A, 304B, 304C. Is output to the select circuit 307, and the command signals DO0P, DO1P, and DO2P are output to the inversion / non-inversion switching circuits 308A, 308B, and 308C. It has become.
[0017]
Next, the operation of the brushless motor control apparatus according to the present embodiment configured as described above will be described with reference to the timing charts shown in FIGS. 5 to 8 and FIGS.
FIG. 5 is a diagram showing the control timing of the three-phase brushless motor 10 and the waveform of each part.
In FIG. 1, a signal having a waveform shown in FIG. 5 is supplied from the logic converter 40 to the switching elements SW-AH and SW-AL, the switching elements SW-BH and SW-BL, and the switching elements SW-CH and SW-CL. Thus, when each switching element is on / off controlled, the drive current flows through the coils LA, LB, and LC of each phase, and the rotor 11 is rotated by generating a rotating magnetic field.
Accordingly, counter electromotive voltages VA, VB, and VC shown in FIG. 5 are induced in the coils LA, LB, and LC of each phase. The counter electromotive voltages VA, VB, and VC are compared with the reference value by passing through the comparator 20, and voltages exceeding the reference value, specifically, as shown in FIG. Delay input signals Va, Vb, and Vc having waveforms obtained by slicing the back electromotive voltages VA, VB, and VC at the neutral point potential are output. The delay input signals Va, Vb, and Vc are delayed by a predetermined time width by the D-flip-flops 306A, 306B, and 306C of the motor delay circuit 30 and the delay counter 311, and the delay output signals VDa, VDb having the waveforms shown in FIG. , VDc is output and input to the logic converter 40.
[0018]
FIG. 6 is a timing chart showing waveforms at various parts during motor acceleration control. In FIG. 6, the delay input signals Va, Vb, and Vc are three-phase signals that are shifted in phase by about 120 °, and the cycle thereof changes in accordance with the rotational speed of the motor, and one cycle is 1 of the motor. This corresponds to / 4 rotation.
The delay output signals VDa, VDb, and VDc are signals that are delayed in phase by about 30 ° from the delay input signals Va, Vb, and Vc.
The delay time width corresponding to the 30 ° phase difference is determined by the contents set in the delay counter 311.
Note that switching of output destinations of the delay output signals VDa, VDb, and VDc and switching of the polarities of the delay output signals VDa, VDb, and VDc can be set by a program.
Further, at this time, the delay input signals Va, Vb, Vc and the delay output signals VDa, VDb, VDc shown in FIG. 6 are the selection signals for the select circuit 307, DOESL0 = DOESL1 = DOESL2 = 0, inversion / non-inversion switching circuit 308A. , 308B, 308C, the command signal is DO0P = DO1P = DO2P = 0.
[0019]
Next, a case where the motor delay circuit 30 is used to control switching from acceleration to deceleration will be described with reference to FIG. FIG. 7 is a timing chart showing a state transition from acceleration to deceleration.
During the execution of the deceleration control, by setting the signals PA, PB, and PC that are input to the AND gates GA, GB, and GC of the sampling circuits 301A, 301B, and 301C, the input sampling is performed by the sampling circuits 301A, 301B, and 301C. In addition, the delay input signals Va, Vb, and Vc are controlled, and the inversion / non-inversion switching circuits 308A, 308B, and 308C are set to inverted outputs so that the polarities of the delay output signals VDa, VDb, and VDc are inverted. Then, by setting the signal PA = PB = PC = 0, the data sampled by the sampling circuits 301A, 301B, 301C in the first stage is held.
[0020]
First, when the rising edge of the delay input signal Vc is detected at time T1 shown in FIG. 7 and the motor delay interrupt request signal SC is input to the interrupt control means 319, the acceleration is switched to the deceleration processing. . Then, after detecting the rising edge of the delay input signal Vc, the selector 304B is set so that only the falling edge of the delay input signal Vb can be accepted. At the same time, the inversion / non-inversion switching circuits 308A, 308B, and 308C are set to inversion outputs so that the polarities of all delay output signals VDa, VDb, and VDc are inverted, and the AND gates GA of the sampling circuits 301A, 301B, and 301C , GB and GC are set to PA = 0, PB = 1, and PC = 0.
Next, when the falling edge of the delay input signal Vb is detected at the time T2 shown in FIG. 7 and the motor delay interrupt request signal SB is input to the interrupt control means 319, the rise of the delay input signal Va. The selector 304A is set so that only the edge can be accepted.
When the rising edge of the delay input signal Va is detected at the time T3 shown in FIG. 7 and the motor delay interrupt request signal SA is input to the interrupt control means 319, the motor delay interrupt request signal SA Interrupt processing is executed.
[0021]
Similarly, the rising edge detection of the delay input signal Vc → the falling edge detection of the delay input signal Vb → the rising edge detection of the delay input signal Va → the rising edge detection of the delay input signal Vc → the falling edge of the delay input signal Vb Edge detection → The input of the effective delay input signal and the edge direction are switched by cyclically detecting the rising edge of the delay input signal Va, whereby the delay input signals Va, Vb, Vc and the delay output after time T1 are switched. Signals VDa, VDb, and VDc are as shown in FIG. 7, and deceleration control processing can be executed.
[0022]
Next, a case where the motor delay circuit 30 is used to control switching from deceleration to acceleration will be described with reference to FIG. FIG. 8 is a timing chart showing a state transition from deceleration to acceleration.
First, when the falling edge of the delay input signal Va is detected at time T4 shown in FIG. 8 and the motor delay interrupt request signal SA is input to the interrupt control means 319, switching from deceleration to acceleration processing is performed. It is done. Then, the inversion / non-inversion switching circuits 308A, 308B, and 308C are set to the non-inversion state so that all the delay output signals VDa, VDb, and VDc are output in the non-inversion state, and the delay input signals Va, Vb The selectors 304A, 304B, and 304C are set so that both rising and falling edges of Vc can be detected. At the same time, the signals for the AND gates GA, GB, and GC are set to PA = 1, PB = 1, and PC = 1 so that all the sampling circuits 301A, 301B, and 301C can perform the sampling operation. Thereby, each delay input signal Va, Vb, Vc is sampled by the respective sampling circuits 301A, 301B, 301C.
Therefore, the delay input signals Va, Vb, Vc and the delay output signals VDa, VDb, VDc after time T4 are as shown in FIG. 8, and the acceleration control process can be executed.
[0023]
Further, in the present embodiment, the A-phase inter-edge time measuring means 315 performs an interval between edges corresponding to one cycle of the delay input signal Va = 1/4 rotation based on the A-phase motor delay interrupt request signal SA. Can be measured.
Further, 7 can measure the time between edges corresponding to one cycle = 1/4 rotation of the delay input signal Vb based on the B phase motor delay interrupt request signal SB by the C phase motor delay ratio 316.
Further, the inter-edge time measuring means 317 for C-phase can measure the time between edges corresponding to one cycle = 1/4 rotation of the delay input signal Vb based on the C-phase motor delay interrupt request signal SC.
Further, the masking time and the delay time can be calculated by the calculation means 318 based on the measurement values measured by the time measuring means 315, 316, and 317 between the edges of the A, B, and C phases.
For example, if the time between edges corresponding to one period = 1/4 rotation measured by the edge time measuring means 315, 316, 317 is Δt, Δt / 4 is the mask time, and Δt / 8 Becomes the delay time, and these are digitized and can be set in the delay register 312 by the respective mask registers 310 or 310.
[0024]
According to the embodiment of the present invention as described above, the motor delay circuit 30 includes the sampling circuits 301A, 301B, 301C, the edge detection circuits 302A, 302B, 302C, and the detected edge signals to the motor delay interrupt request signals SA, SB. By adding selectors 304A, 304B, 304C and interrupt control means 319 for selecting SC, and operating the interrupt control means 319 based on the detected edge signal motor delay interrupt request signals SA, SB, SC, Since the signal pattern is switched from acceleration to deceleration for deceleration control, and the signal pattern is switched from deceleration to acceleration for acceleration control, not only acceleration control but also deceleration control is possible. From acceleration to deceleration or deceleration Smooth transition from acceleration to acceleration and rotation control with constant angular velocity It is possible to optimally perform.
In addition, since the operation state of the motor can be monitored by providing the sampling circuits 301A, 301B, 301C and the edge detection circuits 302A, 302B, 302C, it is possible to realize an optimum brushless motor control system according to the motor status. .
[0025]
The brushless motor control system according to the present invention is not limited to a spindle motor for a hard disk drive, but can be applied to other motors such as a VTR.
The present invention is not limited to a three-phase brushless motor as shown in the above embodiment, and can be applied to a two-phase brushless motor or a three-phase or more brushless motor.
[0026]
【The invention's effect】
As described above, according to the present invention, acceleration / deceleration control of a brushless motor can be performed using a motor delay circuit, and a transition from acceleration to deceleration or deceleration to acceleration can be smoothly performed. Control can be performed optimally.
Further, according to the present invention, since the operation state of the motor can be monitored, there is an effect that an optimum motor control system according to the motor condition can be realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a three-phase brushless motor and its control device in an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a motor delay circuit in the embodiment of the present invention.
FIG. 3 is an explanatory diagram of a rotor and a stator of a brushless motor according to an embodiment of the present invention.
4 is an explanatory view of a brushless motor in a state where the rotor and the stator shown in FIG. 3 are combined. FIG.
FIG. 5 is a diagram showing the control timing of the three-phase brushless motor 10 and the waveform of each part in the embodiment of the present invention.
FIG. 6 is a timing chart showing waveforms of respective parts during motor acceleration control in the embodiment of the present invention.
FIG. 7 is a timing chart showing a state transition from acceleration to deceleration in the embodiment of the present invention.
FIG. 8 is a timing chart showing a state transition from deceleration to acceleration in the embodiment of the present invention.
[Explanation of symbols]
10 ... 3 phase brushless motor, 11 ... rotor, 12 ... stator, LA, LB, LC ... coil for each phase, 20 ... comparator, 30 ... motor delay circuit, 40 ... logic converter, 301A , 301B, 301C... Sampling circuit, 302A, 302B, 302C... Edge detection circuit, 304A, 304B, 304C... Selector, 305A, 305B, 305C. 307: Select circuit, 308A, 308B, 308C ... Invert / non-invert switch circuit, 309 ... Mask counter, 310 ... Mask register, 311 ... Delay counter, 312 ... Delay register, 315 ... Phase A Edge-to-edge time measuring means, 316 ... B-phase edge-to-edge time measurement Stage, 317 ...... C-phase edge interval measuring means 318 ...... calculating means, 319 ...... interrupt control means.

Claims (9)

A stator in which a plurality of coils arranged at equal intervals in the circumferential direction are connected to a plurality of phases, and a stator that is rotatably arranged opposite to the coils of the stator, and is attached to a plurality of poles corresponding to the respective phases. A rotor composed of magnetized magnets, and a switching element for each phase that controls on and off of the current supplied to each coil of each phase; A control device for a brushless motor that rotates a rotor by generating a rotating magnetic field by passing a driving current through a phase coil;
Comparing a counter electromotive voltage induced in the coils of each phase and a reference value to extract a voltage having a level exceeding the reference value as a delay input signal;
A sampling circuit for each phase that samples the extracted delay input signal of each phase and outputs a signal similar to the delay input signal;
An edge detection circuit for each phase for detecting a rising edge and a falling edge of each signal output from the sampling circuit of each phase;
Motor delay for each phase provided for each edge detection circuit of each phase, and selecting one of the rising edge signal and falling edge signal of the signal detected by each edge detection circuit according to the acceleration or deceleration control processing A selector for each phase that is output as an interrupt request signal;
Interrupt control that executes the motor deceleration control process by switching the signal pattern from acceleration to deceleration based on the motor delay interrupt request signal of each phase, or executes the motor acceleration control process by switching the signal pattern from deceleration to acceleration Means,
A delay circuit for each phase that delays each phase signal output from the sampling circuit for each phase for a predetermined time and outputs it as a delay output signal for each phase;
A select circuit that selects and outputs each delay output signal output from the delay circuit of each phase according to a deceleration control process or an acceleration control process of the interrupt control means;
An inversion / non-inversion switching circuit for sending each delay output signal selected and output from the select circuit as non-inverted or inverted in accordance with deceleration control processing or acceleration control processing of the interrupt control means;
Logic conversion means for converting each phase switching element into an on / off signal based on each delay output signal output from each phase inversion / non-inversion switching circuit and outputting the signal to each switching element;
A brushless motor control device comprising: 2. The brushless motor control device according to claim 1, wherein a delay input signal to the sampling circuit of each phase is switched in accordance with a deceleration control process or an acceleration control process of the interrupt control means. The brushless motor control device according to claim 1, further comprising a mask counter that masks a period other than the edge portion of the signal output from the sampling circuit of each phase and prohibits edge detection of the edge detection circuit. 2. The brushless motor control device according to claim 1, wherein the delay time of the delay output signal of each phase by the delay means for each phase is set by a delay counter. 2. The inter-edge time measuring means for each phase for measuring a time between edges corresponding to one cycle of the delay input signal for each motor delay interrupt request signal of each phase. Brushless motor control device. 6. The brushless motor control device according to claim 5, further comprising a calculation unit that calculates a mask time and a delay time based on the measurement values measured by the edge time measurement unit of each phase. 7. The brushless motor control device according to claim 6, further comprising: a mask register in which the mask time data calculated by the calculation means is set; and a delay register in which the delay time data calculated by the calculation means is set. . 8. The brushless motor according to claim 7, wherein mask time data of the mask register is loaded into the mask counter, and delay time data of the delay register is loaded into the delay counter according to an edge signal from the edge detection circuit. Control device. 8. The brushless motor control device according to claim 7, wherein the mask time data of the mask register is loaded into the mask counter by an upflow signal of the delay counter.

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