CN115118186A - Control device for brushless DC motor without position sensor - Google Patents
Control device for brushless DC motor without position sensor Download PDFInfo
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- CN115118186A CN115118186A CN202210733837.1A CN202210733837A CN115118186A CN 115118186 A CN115118186 A CN 115118186A CN 202210733837 A CN202210733837 A CN 202210733837A CN 115118186 A CN115118186 A CN 115118186A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application relates to a control device of a brushless direct current motor without a position sensor, which comprises a driving circuit, a control circuit and a counter electromotive force detection circuit. The control circuit receives a speed given signal and a feedback signal of the motor, compares the speed given signal and the feedback signal, and outputs a PWM signal to control the drive circuit; and the back electromotive force detection circuit receives a three-phase control signal of the motor and performs compensation control on a driving signal of the motor according to the running state of the motor. The invention realizes the phase change of the brushless motor through the electronic commutation of the motor, performs control signal compensation through the back electromotive force detection, improves the control stability, achieves the reliability of motor control through the double closed-loop control, and finally realizes the high-efficiency control of the brushless direct current motor without the position sensor.
Description
Technical Field
The invention belongs to the technical field of brushless direct current motor control, and particularly relates to a control device of a brushless direct current motor without a position sensor.
Background
The direct current motor is divided into a brush direct current motor and a brushless direct current motor at present, the brush direct current motor is commutated through the matching of a brush and a commutator, but the brush direct current motor has the problems of mechanical friction and easy electric spark generation, needs to be maintained regularly, reduces the reliability and increases the maintenance cost. Brushless direct current motors generally acquire rotor position information through three hall effect sensors, incremental or absolute photoelectric encoders, rotary transformers and other position sensors to perform phase change, but the rotor position sensors can increase the size and cost of the motor; secondly, the position sensor has more electric connecting lines, so that electromagnetic interference is easily introduced; thirdly, the installation accuracy of the sensor can directly influence the acquisition of the position information of the motor rotor, so that the running performance of the motor is influenced, and particularly the installation accuracy of the multi-pole motor is difficult to ensure; finally, under severe operating conditions, the reliability and durability of the position sensor may be greatly reduced, and even errors may occur. Based on the above consideration, the brushless dc motor without position sensor has necessity of research and practicality, and the current control of the permanent magnet brushless dc motor mainly focuses on rotor position detection, a torque pulse suppression method and a low rotation speed control technology, and a control method and a control device of the brushless dc motor without position sensor are researched and designed.
As shown in fig. 1, the oscillation circuit in the prior art can output a PWM signal, and a large number of MOS transistors active devices are used, so that the frequency of pulses can be greatly increased, and power consumption can be reduced, but a circuit protection function is not introduced, and the safety is poor.
As shown in fig. 2, the voltage detection apparatus in the prior art has a simple structure and a strong function, but has a low capability of detecting a frequency signal and a narrow application range.
Disclosure of Invention
Technical problem (I)
1. The motor driving device in the prior art has lower safety performance.
2. The motor driving device in the prior art has weak electric signal detection capability.
(II) technical scheme
In view of the above technical problem, the present application provides a control device for a brushless dc motor without a position sensor, including a driving circuit, a control circuit, and a back electromotive force detection circuit.
The driving circuit consists of six driving devices, six freewheeling diodes and a motor, the motor can be equivalently formed by resistors, inductors and counter electromotive force, the brushless direct current motor is connected by stars, a neutral point of the motor is not led out generally, D1, D2, D3, D4, D5 and D6 are 6 freewheeling diodes, VT1, VT2, VT3, VT4, VT5 and VT6 are 6 MOSFET driving tubes, and a capacitor C1 and a capacitor C2 are voltage stabilizing capacitors and play a role in buffering reactive power. The three-phase bridge inverter has three-phase on-off rule change, only two power tubes are in a conducting state at any time, and each switching power tube needs to be conducted by 120 electrical degrees, so that stable control is realized.
The control circuit realizes the control of the speed of the brushless direct current motor in a PWM control mode, controls the motor through speed closed-loop control and current closed-loop control, and can avoid the damage of an inverter when the speed is greatly changed and the adverse effect of rapid change of current on transmission by adopting double closed-loop control. Because the current detection circuit contains an alternating current component, low-pass filtering is adopted, errors caused by delay are eliminated through a given signal and a feedback signal, the current is limited through a resistor R10 and is input to the inverting terminal of an amplifier U1, the feedback limited number errors are eliminated through a resistor R16, a capacitor C7, a resistor R17 and a capacitor C8, the current is input to the in-phase terminal of an amplifier U1 after being subjected to low-pass filtering, the current is output after being controlled and processed through an MOS transistor Q3 after being processed through an amplifier U1, faults generated by the control signal can be effectively avoided, and the stability of the control circuit is improved.
The counter electromotive force detection circuit is input through resistance current limiting, after voltage reduction and low-pass filtering, phase current in a motor is detected and detected through a triode, then difference processing is carried out on the phase current and the output current value of a speed loop, the phase current is respectively input through a resistor R6, a resistor R12 and a resistor R19, and then counter electromotive force detection signals are respectively output through a capacitor C3, a resistor R9, a capacitor C5, a resistor R15, a capacitor C9 and a resistor R21 after low-pass filtering processing, and then the counter electromotive force detection signals are respectively output through triodes Q1, Q2 and Q3, effective detection signals are fed back, and circuit faults caused by overhigh counter electromotive force are avoided.
The method comprises a rotor pre-positioning stage, a variable acceleration operation stage and a back electromotive force reversing stage, and is characterized in that the starting of the brushless direct current motor without the position sensor is realized by adopting a three-stage starting method comprising the rotor pre-positioning stage, the variable acceleration operation stage and the back electromotive force reversing stage, the phase change of the brushless direct current motor is realized by the electronic reversing of the motor, the control signal compensation is carried out by the back electromotive force detection, the control stability is improved, the reliability of motor control is realized by double closed-loop control, and the efficient control of the brushless direct current motor without the position sensor is finally realized.
(III) advantageous effects
The application discloses no position sensor brushless DC motor controlling means at first, can protect the motor normal operating, avoids overheated, fault such as overcurrent, and its control signal has better monotonicity and periodicity through filtering and step-down processing back electromotive force signal, easily detects.
Drawings
Fig. 1 is a prior art oscillator circuit.
Fig. 2 is a prior art voltage detection circuit.
Fig. 3 is a schematic diagram of a connection of the permanent magnet brushless dc motor according to the present invention.
Fig. 4 is a schematic diagram of a control circuit of the present application.
Fig. 5 is a schematic diagram of a back electromotive force detection circuit according to the present application.
Detailed Description
The present invention will be further described with reference to the following examples.
The brushless direct current control device realizes a three-stage starting mode through a rotor pre-positioning stage, a variable acceleration operation stage and a back electromotive force reversing stage. The permanent magnet brushless direct current motor control system is composed of a motor body, an inverter, a position detection unit, a power supply and the like, wherein the inverter takes an IGBT tube as a core and can drive the brushless direct current motor, and the IGBT tube is integrated with overvoltage, overcurrent, undervoltage and other protection circuits, self-diagnosis and other information, so that the reliability of the inverter is improved.
As shown in fig. 3, 4, and 5, the present application provides a control apparatus for a brushless dc motor without a position sensor, which includes a driving circuit, a control circuit, and a back electromotive force detection circuit, wherein the driving circuit drives the brushless dc motor by using a star connection method, and the control circuit compares a speed setting signal and a feedback signal of the motor and outputs a PWM signal to control the driving circuit; the back electromotive force detection circuit receives a three-phase control signal of the motor and carries out compensation control on a driving signal of the motor according to the running state of the motor.
The driving circuit consists of six driving devices, six freewheeling diodes and a motor, the motor can be equivalently formed by resistance, inductance and counter electromotive force, the brushless direct current motor adopts star connection, the neutral point of the motor is not led out generally, D1, D2, D3, D4, D5 and D6 are 6 freewheeling diodes, VT1, VT2, VT3, VT4, VT5 and VT6 are 6 driving tubes, and a capacitor C1 and a capacitor C2 are voltage-stabilizing capacitors and play a role in buffering reactive power. The three-phase bridge type inverter has three-phase on-off rule change, only two power tubes are in a conducting state at any time, and each switching power tube needs to be conducted by 120 electrical degrees, so that stable control is realized.
Specifically, the driving circuit comprises an input port Vin, the input port Vin receives PWM signals output by the control circuit to drive 6 driving tubes, and the driving circuit comprises resistors R1, R2, R3, R4 and R5, capacitors C1 and C2, inductors L1, L2 and L3, IGBT tubes VT1, VT2, VT3, VT4, VT5 and VT6, and diodes D1, D2, D3, D4, D5 and D6. The input port Vin is connected with one end of a resistor R1, one end of a resistor R5, one end of a capacitor C1 and one end of a capacitor C2 respectively, the other end of the resistor R1 is connected with gate electrodes (not all shown in FIG. 3) of VT1, VT2 and VT3 and the other end of a capacitor C1, the other end of the resistor R5 is connected with gate electrodes (not all shown in FIG. 3) of VT4, VT5 and VT6 and the other end of a capacitor C2, one end of a p-type emitter of an IGBT VT1 is connected with a high-level VCC, an n-type emitter of the IGBT VT1 is connected with one end of the resistor R1, an anode of a diode D1 and the p-type emitter of the IGBT VT1 respectively, the other end of the resistor R1 is connected with one end of an inductor L1, the other end of the inductor L1 is connected with one end of a V _ M1 port and one end of a rotor E1 of a motor E1, the inductor L1 is used for receiving inverted phase signals, one end of the IGBT VT 72 simultaneously, one end of the IGBT VT1 is connected with one end of the p-type emitter of the IGBT VT1 and one end of the IGBT emitter of the IGBT VT 72 are connected with the high-level VCC 1 respectively of the IGBT emitter of the IGBT T-type emitter 1, and the IGBT T-type emitter of the IGBT 1 respectively, The anode of the diode D2 and the p-type emitter of the IGBT tube VT5 are connected, the other end of the resistor R3 is connected with one end of the inductor L2, the other end of the inductor L2 is connected with the port V _ M2 and one end of the motor rotor E2 in FIG. 5, the other end of the inductor L2 is used for receiving the reverse electromotive force signal at the same time, one end of the p-type emitter of the IGBT tube VT3 is connected with the high-level VCC, the n-type emitter of the IGBT tube VT3 is connected with one end of the resistor R4, the anode of the diode D3 and the p-type emitter of the IGBT tube VT6 respectively, the other end of the resistor R4 is connected with one end of the inductor L3, the other end of the inductor L3 is connected with the port V _ M3 and one end of the motor rotor E3 in FIG. 5, the other end of the inductor L3 is used for receiving the reverse electromotive force signal at the same time, one end of the n-type emitter of the IGBT tube VT4 is grounded, the cathode of the diode D4 is connected with the p-type emitter of the IGBT tube 4, the cathode of the diode D4 is connected with the p-type emitter of the IGBT tube VT5, one end of the IGBT tube VT5 and the IGBT tube 5, the cathode of the diode D5 is connected to the p-type emitter of the IGBT VT5, the anode of the diode D5 is grounded, one end of the n-type emitter of the IGBT VT6 is grounded, the cathode of the diode D6 is connected to the p-type emitter of the IGBT VT6, the anode of the diode D6 is grounded, and the other end of the motor rotor E1, the other end of the motor rotor E2, and the other end of the motor rotor E3 are connected to each other.
Specifically, the control circuit comprises input ports Va and Vb, resistors R1, R8, R10, R11, R17 and R16, capacitors C4, C7 and C8, an amplifier U1 and a diode D7, wherein a motor control signal Va passes through a resistor R10 and then is subjected to voltage division through a resistor R11 and then is input to the inverting terminal of an amplifier U1, and a motor control signal Vb passes through a resistor R16 and a resistor R17 and is input to the inverting terminal of an amplifier U1. The input port Va is connected to one end of a resistor R10, the other end of the resistor R10 is connected to one end of a resistor R11 and a No. 2 interface of an amplifier U1, the other end of the resistor R11 is connected to one end of a resistor R8 and a No. 3 interface of an amplifier U1, the other end of the resistor R8 is connected to one end of a capacitor C4 and an anode of a diode D7, the other end of the capacitor C4 is grounded, a cathode of the diode D7 is connected to a No. 4 interface of the amplifier U1, the input port Vb is connected to one end of a resistor R16, the other end of the resistor R16 is connected to one end of a resistor R17 and one end of a capacitor C7, the other end of the capacitor C7 is grounded, the other end of the resistor R17 is connected to one end of a capacitor C8 and a No. 1 interface of the amplifier U1, the other end of the capacitor C8 is grounded, and a No. 5 interface of the amplifier U1 is grounded. The control circuit further comprises an output port Vc, stable motor control signals are output between a source electrode of the MOS transistor Q3 and the resistor R18, namely PWM control signals are used for controlling six IGBT transistors VT1, VT2, VT3, VT4, VT5 and VT6 in the driving circuit, a No. 4 interface of the amplifier U1 is connected with one end of the capacitor C6 and one end of the resistor R14 respectively, the other end of the capacitor C6 is grounded, the other end of the resistor R14 is connected with a grid electrode of the MOS transistor Q3, a drain end of the MOS transistor Q3 is connected with a high-level VCC, a source end of the amplifier U1 is connected with one end of the resistor R18 and the output port Vc respectively, and the other end of the resistor R18 is grounded.
The control circuit realizes the control of the speed of the brushless direct current motor in a PWM control mode, controls the motor through speed closed-loop control and current closed-loop control, can avoid the damage of an inverter when the speed is greatly changed by adopting double closed-loop control, can avoid the adverse effect of the rapid change of the current on transmission, and can realize the double closed-loop control by inputting the control signal of the motor to U1 through Va and Vb. Because the current detection circuit of the motor is provided with an alternating current component, low-pass filtering is adopted, errors caused by delay are eliminated through a speed given signal Va and a feedback signal Vb, the signals are firstly subjected to low-pass filtering processing through a resistor R16, a capacitor C7, a resistor R17 and a capacitor C8 and then input into a same-phase end of U1, the signals are fed back to an inversion end of U1 through R8 and then compared with signals at the same-phase end to eliminate delay errors, the signals are input into an inversion end of an amplifier U1 through a resistor R10 in a current limiting mode, the signals are input into a same-phase end of an amplifier U1 through a resistor R16, a capacitor C7, a resistor R17 and a capacitor C8 after being subjected to low-pass filtering to eliminate feedback errors, the signals are compared through U1 to eliminate the delay errors, the R8 plays a voltage division role, the C4 plays a filtering decoupling role, the U1 outputs the signals after being subjected to preliminary amplification, the signals are output after being subjected to control processing through an MOS tube Q3, and the output power of the MOS tube Q3 is improved, the fault generated by the control signal can be effectively avoided, the Vc is accessed to the control part of the motor after the PWM control signal is effectively output, and the stability of the control circuit is improved.
As shown in fig. 5, the back electromotive force detection circuit performs current-limiting input through a resistor, performs voltage reduction and low-pass filtering, detects phase current in the motor through a triode, performs difference processing with an output current comparison value of a speed loop, detects whether the back electromotive force is consistent with a motor control signal and an actual operation signal, realizes closed-loop control, performs low-pass filtering processing through a resistor R6, a resistor R12 and a resistor R19 respectively to output back electromotive force detection signals, performs low-pass filtering processing through a capacitor C3, a resistor R9, a capacitor C5, a resistor R15, a capacitor C9 and a resistor R21 respectively to output back electromotive force detection signals through triodes Q1, Q2 and Q3, enables the triode to work in a cut-off state or a saturated state or an amplified state through three-phase signals, thereby obtains whether the actual state of the motor is consistent with the action of the control signal, compensates through amplifying the signals if the signals are too low, avoids circuit fault caused by too high back electromotive force through the cut-off state if the signals are too high, the ports M1, M2 and M3 are used for receiving motor three-phase control signals input from the outside, and the motors can be accurately controlled by the external signals.
Specifically, the back electromotive force detection circuit includes input ports M1, M2, M3, resistors R6, R12, R19, R7, R9, R13, R15, R20, r21, capacitors C3, C5, and C9, wherein the input port M1 is connected to one end of a resistor R6, the other end of a resistor R6 is connected to one end of a capacitor C3, one end of a resistor R9, and one end of a resistor R7, the other end of the capacitor C3 is grounded, the other end of the resistor R9 is grounded, the input port M2 is connected to one end of a resistor R12, the other end of the resistor R12 is connected to one end of a capacitor C5, one end of a resistor R15, and one end of a resistor R13, the other end of a capacitor C5 is grounded, the other end of a resistor R15 is grounded, the input port M3 is connected to one end of a resistor R19, the other end of a resistor R19 is connected to one end of a capacitor C9, one end of a resistor R20, and one end of a resistor R21, the other end of a capacitor C9 is grounded, and the other end of a resistor R21 is grounded. The back electromotive force detection circuit further comprises output ports V _ M1, V _ M2 and V _ M3, resistors R7, R13 and R20, triodes Q1, Q2 and Q4, the other end of the resistor R7 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with a high-level VCC, the emitter of the triode Q1 is connected with the output port V _ M1, the other end of the resistor R13 is connected with the base of the triode Q2, the collector of the triode Q2 is connected with the high-level VCC, the emitter of the triode Q2 is connected with the output port V _ M2, the other end of the resistor R20 is connected with the base of the triode Q4, the collector of the triode Q4 is connected with the high-level VCC, and the emitter of the triode Q4 is connected with the output port V _ M3. V _ M1, V _ M2, V _ M3 output back electromotive force detection signal respectively, and the three-phase signal can make the triode work in cutting off the state or saturation state or amplification state to obtain whether the motor actual state is unanimous with the action of control signal, if the signal is low excessively can compensate through the amplification signal, if the signal is too high can avoid the circuit trouble that back electromotive force too high leads to through cutting off the state.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (6)
1. The device for controlling the brushless direct current motor without the position sensor is characterized in that: the brushless direct current motor speed control circuit comprises a driving circuit, a control circuit and a back electromotive force detection circuit, wherein the driving circuit is used for controlling the starting and the closing of a brushless direct current motor, and the control circuit receives a speed given signal and a feedback signal of the motor, compares the speed given signal and the feedback signal and outputs a PWM signal to control the driving circuit; and the back electromotive force detection circuit receives a three-phase control signal of the motor and performs compensation control on a driving signal of the motor according to the running state of the motor.
2. The control apparatus of the brushless dc motor without the position sensor according to claim 1, wherein: the control circuit comprises input ports Va and Vb, resistors R1, R8, R10, R11, capacitors C11, a C11, an amplifier U11 and a diode D11, wherein the input port Va is connected with one end of the resistor R11, the other end of the resistor R11 is respectively connected with one end of the resistor R11 and a No. 2 interface of the amplifier U11, the other end of the resistor R11 is respectively connected with one end of the resistor R11 and a No. 3 interface of the amplifier U11, the other end of the resistor R11 is respectively connected with one end of the capacitor C11 and an anode of the diode D11, the other end of the capacitor C11 is grounded, a cathode of the diode D11 is connected with a No. 4 interface of the amplifier U11, an input port Vb is connected with one end of the resistor R11, the other end of the resistor R11 is respectively connected with one end of the capacitor C11 and an interface of the capacitor U11, the other end of the capacitor C8 is grounded, and the No. 5 interface of the amplifier U1 is grounded.
3. The control apparatus of the position sensorless brushless dc motor according to claim 1, characterized in that: the control circuit comprises an output port Vc, an amplifier U1, a capacitor C6, resistors R14, R18 and a MOS tube Q3, wherein a No. 4 interface of the amplifier U1 in the control circuit is respectively connected with one end of a capacitor C6 and one end of a resistor R14, the other end of the capacitor C6 is grounded, the other end of the resistor R14 is connected with a grid electrode of the MOS tube Q3, a drain end of the MOS tube Q3 is connected with a high-level VCC, a source end of the MOS tube Q3 is respectively connected with one end of the resistor R18 and the output port Vc, and the other end of the resistor R18 is grounded.
4. The control apparatus of the position sensorless brushless dc motor according to claim 1, characterized in that: the driving circuit comprises an input port Vin, resistors R1, R2, R3, R4, R5, capacitors C1 and C2, inductors L1, L2 and L3, IGBT tubes VT3, diodes D3, D3 and D3, wherein the input port Vin is respectively connected with one end of the resistor R3, one end of the capacitor C3 and one end of the capacitor C3, the other end of the resistor R3 is connected with the gates of the IGBT tubes VT3, VT3 and VT3, the other end of the resistor R3 is connected with the gates of the IGBT tubes VT3, the other end of the capacitor C3, one end of the p-type emitter of the IGBT tube 3 is connected with a high level, one end of the IGBT tube VT3 is connected with the gate of the IGBT tube VT3, the N-type emitter of the IGBT tube VT 72, the IGBT tube VCC, the IGBT tube VT3, the gate of the IGBT tube VT 72 is connected with the inductor L3, the IGBT tube VT 72, the IGBT tube VT electrode of the IGBT tube VT 72 is connected with the IGBT tube VT 72, the IGBT tube VT tube 72 is connected with the gate of the IGBT tube VT tube 72, the IGBT tube VT tube 72, an n-type emitter of an IGBT tube VT2 is respectively connected with one end of a resistor R3, an anode of a diode D2 and a p-type emitter of the IGBT tube VT5, the other end of the resistor R3 is connected with one end of an inductor L2, the other end of the inductor L2 is connected with a port V _ M2 of an electrode, one end of the p-type emitter of the IGBT tube VT3 is connected with a high-level VCC, an n-type emitter of an IGBT tube VT3 is respectively connected with one end of the resistor R4, the anode of a diode D3 and the p-type emitter of the IGBT tube VT6, the other end of a resistor R4 is connected with one end of the inductor L3, the other end of the inductor L3 is connected with a port V _ M3 of the electrode, one end of the n-type emitter of the IGBT tube VT4 is grounded, the cathode of a diode D4 is connected with the p-type emitter of the IGBT tube VT4, the anode of a diode D4 is grounded, one end of the n-type emitter of the IGBT tube 5 is grounded, one end of the IGBT tube VT5 is grounded, the cathode of the IGBT tube VT5 is connected with the anode of the IGBT tube VT 3982 and the diode D5, one end of an n-type emitter of the IGBT tube VT6 is grounded, a cathode of the diode D6 is connected with a p-type emitter of the IGBT tube VT6, and an anode of the diode D6 is grounded.
5. The control apparatus of the position sensorless brushless dc motor according to claim 1, characterized in that: the back electromotive force detection circuit comprises input ports M1, M2 and M3, resistors R6, R12, R19, R7, R9, R13, R15, R20 and R21, capacitors C3, C5 and C9, in the counter electromotive force detection circuit, an input port M1 is connected with one end of a resistor R6, the other end of a resistor R6 is connected with one end of a capacitor C3, one end of a resistor R9 and one end of a resistor R7 respectively, the other end of a capacitor C3 is grounded, the other end of a resistor R9 is grounded, an input port M2 is connected with one end of a resistor R12, the other end of a resistor R12 is connected with one end of a capacitor C5, one end of a resistor R15 and one end of a resistor R13 respectively, the other end of a capacitor C5 is grounded, the other end of a resistor R15 is grounded, an input port M3 is connected with one end of a resistor R19, the other end of a resistor R19 is connected with one end of a capacitor C9, one end of a resistor R20 and one end of a resistor R21 respectively, the other end of a capacitor C9 is grounded, and the other end of a resistor R21 is grounded.
6. The control apparatus of the position sensorless brushless dc motor according to claim 1, characterized in that: the back electromotive force detection circuit comprises output ports V _ M1, V _ M2, V _ M3, resistors R7, R13, R20, triodes Q1, Q2 and Q4, the other end of a resistor R7 in the back electromotive force detection circuit is connected with the base of a triode Q1, the collector of the triode Q1 is connected with high-level VCC, the emitter of the triode Q1 is connected with the output port V _ M1, the other end of the resistor R13 is connected with the base of a triode Q2, the collector of the triode Q2 is connected with the high-level VCC, the emitter of the triode Q2 is connected with the output port V _ M2, the other end of the resistor R20 is connected with the base of the triode Q4, the collector of the triode Q4 is connected with the high-level VCC, and the emitter of the triode Q4 is connected with the output port V _ M3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733837.1A CN115118186A (en) | 2022-06-27 | 2022-06-27 | Control device for brushless DC motor without position sensor |
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| CN101729013A (en) * | 2009-11-27 | 2010-06-09 | 哈尔滨工业大学 | IP core of position sensor-free and brushless direct-current motor |
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Application publication date: 20220927 |