CN108448956B - Rotor position detection device of six-phase asymmetric square wave motor - Google Patents
Rotor position detection device of six-phase asymmetric square wave motor Download PDFInfo
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- CN108448956B CN108448956B CN201810412398.8A CN201810412398A CN108448956B CN 108448956 B CN108448956 B CN 108448956B CN 201810412398 A CN201810412398 A CN 201810412398A CN 108448956 B CN108448956 B CN 108448956B
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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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Abstract
The invention discloses a rotor position detection device of a six-phase asymmetric square wave motor, which comprises: the main control module outputs DCT control signals to control the switching elements of the two sets of three-phase inverters; the two non-commutation voltage selectors are connected with the three-phase terminals of the corresponding three-phase winding and used for selecting the non-commutation ends in the three-phase winding; the two filter circuits are used for respectively filtering the non-commutation end voltages of the two sets of three-phase windings; the two voltage division circuits are used for respectively dividing the voltage of the two non-commutation ends after the filtering treatment; and the two voltage comparison modules are respectively used for comparing the divided voltage of the two non-commutation ends with a reference voltage so as to output a non-commutation back electromotive force zero-crossing signal. And the main control module processes the counter potential zero-crossing signal which is not subjected to phase commutation to obtain the position of the rotor, so that the phase commutation moment of the motor is determined. The detection device of the invention abandons a position sensor, indirectly obtains the position of a rotor by detecting various physical quantities in a system, and enables a motor to carry out phase change.
Description
Technical Field
The invention belongs to the technical field of motors, and relates to a rotor position detection device of a six-phase asymmetric square wave motor.
Background
The driving current of the brushless dc motor is an alternating current, and generally, the driving current of the brushless dc motor is divided into two types, one is a square wave and the other is a sine wave. The technology of the brushless direct current square wave motor with the position sensor is mature day by day, but the position sensor can generate wrong signals to interfere the system under a severe environment, so that the development of the detection technology without the position sensor is necessary.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a rotor position detecting device for a six-phase asymmetric square wave motor.
The invention provides a rotor position detection device of a six-phase asymmetric square wave motor, wherein two sets of three-phase inverters are connected in parallel on a direct current power supply, and each set of three-phase inverter is respectively connected with one set of three-phase winding, and the rotor position detection device comprises:
the main control module controls the switching elements in the two sets of three-phase inverters by outputting DCT control signals so as to control the phase change of the motor;
each non-commutation voltage selector is connected with a three-phase terminal of a corresponding three-phase winding and used for selecting a non-commutation end in each set of three-phase winding and outputting the end voltage;
the two filter circuits are used for respectively filtering the non-commutation end voltages of the two sets of three-phase windings;
the two voltage division circuits are used for respectively dividing the voltage of the two non-commutation ends after the filtering treatment;
the two voltage comparison modules are respectively used for comparing the divided voltage of the two non-commutation ends with a reference voltage so as to output a non-commutation back electromotive force zero-crossing signal;
the main control module processes the counter potential zero-crossing signal of the non-commutation to obtain the position of the rotor, so that the commutation moment of the motor is determined.
In the rotor position detection device of the six-phase asymmetric square wave motor, the device further comprises a reference voltage selection circuit which is respectively connected with the main control module and the voltage comparison module, wherein the reference voltage selection circuit comprises a first switch, a second switch, an eleventh resistor and a twelfth resistor; one end of the eleventh resistor is connected with the positive electrode of the direct-current power supply, and the other end of the eleventh resistor is grounded through the twelfth resistor; one end of the first switch is connected to the intersection point of the eleventh resistor and the twelfth resistor, and the other end of the first switch is connected with the input ends of the two voltage comparison modules respectively; one end of the second switch is connected with the negative electrode of the direct-current power supply, and the other end of the second switch is respectively connected with the input ends of the two voltage comparison modules; the main control module controls the first switch and the second switch to be switched on and switched off so as to output different reference voltages.
In the rotor position detecting device of the six-phase asymmetric square wave motor of the present invention, the reference voltage selection method includes:
when the motor is in a six-phase working mode and the PWM duty ratio of a DCT control signal output by the main control module is less than 50%, the main control module closes the second switch and keeps the first switch disconnected, and the reference voltage selection circuit selects the reference voltage as zero voltage;
when the motor is in a six-phase working mode and the PWM duty ratio of a DCT control signal output by the main control module is more than 50%, the main control module disconnects the second switch and closes the first switch at the same time, and the reference voltage selection circuit selects the reference voltage as one tenth of the voltage of the direct-current bus;
when the rotating speed of the motor is increased to a certain value, a set of three-phase winding with larger back electromotive force is cut off, the motor operates in a three-phase working mode, the PWM duty ratio of a DCT control signal output by the main control module is larger than 50%, the main control module continuously keeps the second switch disconnected, the first switch is closed, and the reference voltage selection circuit selects the reference voltage to be one tenth of the voltage of the direct-current bus.
In the rotor position detection device of the six-phase asymmetric square wave motor, the main control module comprises a DSP chip and a CPLD chip which are connected with each other, the DSP chip is used for outputting DCT control signals and control instructions and processing counter potential zero-crossing signals which are not phase-commutation to obtain the position of a rotor; the CPLD chip is used for processing signals and control instructions input and output by the DSP chip.
In the rotor position detecting apparatus of a six-phase asymmetric square wave motor of the present invention, the filter circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a third capacitor; the first resistor, the second capacitor and the third resistor are sequentially connected in series between the non-commutation voltage selector and the voltage division circuit; the first capacitor is connected with the second resistor in series and then connected with the second capacitor in parallel; one end of the third capacitor is connected to the intersection point of the third resistor and the voltage division circuit, and the other end of the third capacitor is grounded.
In the rotor position detecting apparatus of a six-phase asymmetric square wave motor of the present invention, the voltage dividing circuit includes: the filter circuit comprises a seventh resistor, an eighth resistor and a seventh capacitor, wherein one end of the seventh resistor is connected with the filter circuit, the other end of the seventh resistor is grounded through the eighth resistor, and the seventh capacitor is connected with the eighth resistor in parallel; after the voltage is divided by the seventh resistor and the eighth resistor, the intersection point of the seventh resistor and the eighth resistor is used as a non-commutation-end voltage output end after voltage division and is connected with the input end of the voltage comparison module.
The rotor position detection device of the six-phase asymmetric square wave motor can improve the back electromotive force zero-crossing detection sensitivity in a low-speed section, can improve the back electromotive force zero-crossing detection sensitivity in the low-speed section by improving the high-speed sampling circuit, and can effectively avoid damage to the detection circuit caused by overhigh back electromotive force amplitude by improving the high-speed sampling circuit, ensure that the six-phase asymmetric motor works in a wider rotating speed range, simplify the system, reduce the noise in the operation of the system, ensure that the system operates more reliably in a severe environment and starts to operate at high torque.
Drawings
Fig. 1 is a block diagram of a rotor position detecting apparatus of a six-phase asymmetric square wave motor of the present invention.
Detailed Description
A rotor position detecting apparatus of a six-phase asymmetric square wave motor of the present invention is explained with reference to the accompanying drawings.
As shown in fig. 1, the rotor position detecting apparatus of a six-phase asymmetric square wave motor of the present invention is used for detecting the position of a rotor without a position sensor. In this embodiment, the six-phase asymmetric square wave motor includes two sets of asymmetric three-phase windings, one set of three-phase winding includes three phases U, V, and W, and the other set of three-phase winding includes three phases R, S, and T. The two sets of three-phase windings are connected through a direct contactor Q. DC power supply UdTwo sets of three-phase inverters 7 are connected in parallel, and each set of three-phase inverter 7 is connected with one set of three-phase winding.
As shown in fig. 1, the rotor position detecting apparatus of the present invention includes: the device comprises a main control module 1, two non-commutation voltage selectors 2, two filter circuits 3, two voltage division circuits 4, two voltage comparison modules 5 and a reference voltage selection circuit 6.
As shown, the first set of three-phase inverters 7 includes six thyristors T1, T2, T3, T4, T5, and T6.Specifically, the thyristors T1, T3, and T5 are connected to the positive electrode of the dc power supply, and the thyristors T2, T4, and T6 are connected to the negative electrode of the dc power supply. The other set of three-phase inverters 7 comprises six thyristors T7, T8, T9, T10, T11 and T12. Specifically, thyristors T7, T9, and T11 are connected to the positive pole of the dc power supply, and thyristors T8, T10, and T12 are connected to the negative pole of the dc power supply. Three-phase inverter 7 converts direct current power supply UdConverted into an alternating voltage.
The main control module 1 controls 12 switching elements in the two sets of three-phase inverters 7 by outputting DCT control signals, namely states of 12 thyristors T1-T12, so as to control phase change of the motor. The non-commutation voltage selector 2 is connected to three-phase terminals of the three-phase winding, and selects a non-commutation terminal of the three-phase winding and outputs the terminal voltage.
The detection object in this embodiment is a six-phase asymmetric square wave motor, and therefore, two non-commutation voltage selectors 2 are provided, one of the non-commutation voltage selectors 2 is connected to the three phases U, V, and W of the first set of three-phase windings, and the other non-commutation voltage selector 2 is connected to the three phases R, S, and T of the second set of three-phase windings. In specific implementation, the non-commutation voltage selector 2 is subject to an 8-channel analog multiplexer, which is model hef4051b, and circuit development is performed on the basis of the 8-channel analog multiplexer. When the motor is just started and operates in a six-phase state, the contactor Q is closed, and the forward current of the direct-current power supply flows through the U-phase winding through the thyristor T1 and flows to the negative side of the direct-current power supply through the V-phase winding and the thyristor T6; meanwhile, the forward current of the direct current power supply flows through the R-phase winding through the thyristor T7 and flows to the negative side of the direct current power supply through the S-phase winding and the thyristor T12, the W-phase winding and the T-phase winding are non-commutation phases, and the W-phase winding and the T-phase winding are selected through the non-commutation phase voltage selector 2.
The filter circuit 3 is connected with the non-commutation voltage selector 2 and is used for filtering the non-commutation end voltage of the three-phase winding. As shown in fig. 1, the detection apparatus of the present invention is provided with two filter circuits 3 for respectively filtering the non-commutation terminal voltages of two sets of three-phase windings. The first filter circuit 3 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2 and a third capacitor C3. The first resistor R1, the second capacitor C2 and the third resistor R3 are sequentially connected in series between the non-commutation voltage selector 2 and the voltage division circuit 4. The first capacitor C1 and the second resistor R2 are connected in series and then connected in parallel with the second capacitor C2. One end of the third capacitor C3 is connected to the intersection of the third resistor R3 and the voltage divider circuit 4, and the other end is grounded. The second filter circuit 3 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6. The fourth resistor R4, the fifth capacitor C5 and the sixth resistor R6 are sequentially connected in series between the non-commutation voltage selector 2 and the voltage division circuit 4. The fourth capacitor C4 is connected in series with the fifth resistor R5 and then connected in parallel with the fifth capacitor C5. One end of the sixth capacitor C6 is connected to the intersection point of the sixth resistor R6 and the voltage divider circuit 4, and the other end is grounded.
The voltage division circuit 4 is connected with the filter circuit 3 and is used for dividing the voltage of the two non-commutation ends after the filtering processing. As shown in fig. 1, the detection apparatus of the present invention is provided with two voltage dividing circuits 4 for dividing the voltage of two non-commutation terminals after filtering. The first voltage dividing circuit 4 includes: a seventh resistor R7, an eighth resistor R8 and a seventh capacitor C7. One end of the seventh resistor R7 is connected with the filter circuit 3, the other end of the seventh resistor R7 is grounded through an eighth resistor R8, and the seventh capacitor C7 is connected with the eighth resistor R8 in parallel; after voltage division is performed by the seventh resistor R7 and the eighth resistor R8, the intersection point of the seventh resistor R7 and the eighth resistor R8 is used as a non-commutation-phase-change terminal voltage output end after voltage division and is connected with the input end of the voltage comparison module 5. The other voltage dividing circuit 4 includes: a ninth resistor R9, a tenth resistor R10, and an eighth capacitor C8. One end of the ninth resistor R9 is connected with the filter circuit 3, the other end of the ninth resistor R9 is grounded through a tenth resistor R10, and the eighth capacitor C8 is connected with the tenth resistor R10 in parallel; after the voltage is divided by the ninth resistor R9 and the tenth resistor R10, the intersection point of the ninth resistor R9 and the tenth resistor R10 is connected to the input terminal of the voltage comparison module 5 as the voltage output terminal of the non-commutation terminal after voltage division.
The voltage comparison module 5 is used for comparing the divided non-commutation terminal voltage with a reference voltage UrefAnd comparing to output a non-commutation back electromotive force zero-crossing signal. The detection device is provided with two voltage comparison modules 5And the voltage divider is used for comparing the divided two non-commutation terminal voltages with a reference voltage to output a non-commutation back electromotive force zero-crossing signal.
Reference voltage UrefGenerated by the reference voltage selection circuit 6. The reference voltage selection circuit 6 is respectively connected to the main control module 1 and the voltage comparison module 5, and the reference voltage selection circuit 6 includes a first switch S1, a second switch S2, an eleventh resistor R11 and a twelfth resistor R12; one end of the eleventh resistor R11 is connected with a DC power supply UdThe positive electrodes are connected, and the other end of the positive electrode is grounded through a twelfth resistor R12; one end of the first switch S1 is connected to the intersection of the eleventh resistor R11 and the twelfth resistor R12, and the other end is connected to the input ends of the two voltage comparison modules 5 respectively; one end of the second switch S2 and the DC power supply UdThe negative electrodes are connected, and the other ends of the negative electrodes are respectively connected with the input ends of the two voltage comparison modules 5; the main control module 1 controls the first switch S1 and the second switch S2 to be turned on and off to output different reference voltages. Wherein, the DC bus is a DC power supply UdThe voltage is divided by the eleventh resistor R11 and the twelfth resistor R12 to obtain one tenth of the direct current bus voltage as a reference value, and the other reference value is directly connected with the ground wire. The reference voltage is selected in a manner that:
when the motor is in a six-phase working mode and the PWM duty cycle of the DCT control signal output by the main control module 1 is less than 50%, the main control module 1 turns off the second switch S2 while keeping the first switch S1 turned off, and the reference voltage selection circuit 6 selects the reference voltage as zero voltage;
when the motor is in a six-phase working mode and the PWM duty ratio of the DCT control signal output by the main control module 1 is greater than 50%, the main control module 1 turns off the second switch S2 while turning off the first switch S1, and the reference voltage selection circuit 6 selects the reference voltage as one tenth of the dc bus voltage;
when the rotating speed of the motor is increased to a certain value, a set of three-phase windings with large back electromotive force is cut off, the motor operates in a three-phase working mode, the PWM duty ratio of a DCT control signal output by the main control module 1 is larger than 50%, the main control module 1 continuously keeps the second switch S2 disconnected, the first switch S1 is closed, and the reference voltage selection circuit 6 selects the reference voltage as one tenth of the DC bus voltage.
The main control module 1 processes the non-commutation back electromotive force zero-crossing signal output by the voltage comparison module 5 to obtain the position of the rotor, so as to determine the commutation moment of the motor. In specific implementation, the main control module 1 includes a DSP chip and a CPLD chip that are connected to each other. And the DSP chip is used for outputting DCT control signals and control instructions and processing the non-commutation counter potential zero-crossing signals to obtain the rotor position. The CPLD chip is used for processing signals and control instructions input and output by the DSP chip.
The motor operates at high and low speeds, requiring a higher PWM duty cycle to power the motor when the speed is high and a lower PWM duty cycle to limit the excess energy when the speed is low.
The detection device of the invention detects the high rotation speed according to the H _ PWM _ ON-L _ ON modulation mode, and the reference voltage is selected to be one tenth of the DC bus voltage. The H _ PWM _ OFF-L _ ON modulation mode is detected at low speed, and the reference voltage is selected as zero voltage. This has a better effect on AD detection and comparative detection 7 of back emf zero crossings in the DSP chip.
Since the six-phase motor cuts off the three-phase winding with larger back electromotive force when the rotating speed is increased to a certain value, so that the motor operates in the remaining three-phase operating mode, the rotating speed is higher compared with the six-phase when the motor operates in three phases, and therefore, an H _ PWM _ ON-L _ ON modulation mode is adopted, and the reference voltage is selected to be one tenth of the direct-current bus voltage. The DCT signal is used herein to control the PWM according to the duty cycle and the three six phase operating state, respectively. Specifically, the following are:
(1) when the six-phase motor is operated under a six-phase winding just after being started, the rotating speed of the motor is lower than a threshold value at the moment, and the PWM duty ratio is smaller than 50%, an H _ PWM _ OFF-L _ ON modulation mode is applied, and the reference voltage is selected as zero voltage at the moment to be compared to obtain a counter potential zero-crossing detection signal.
(2) When the rotating speed of the motor continues to rise and the PWM duty ratio is larger than 50%, an H _ PWM _ ON-L _ ON modulation mode is applied, at the moment, the reference voltage is selected to be one tenth of the direct-current bus voltage, and comparison is carried out to obtain a counter potential zero-crossing detection signal;
(3) when the rotating speed is increased to a threshold value, three-phase windings (R, S and T phases) with large back electromotive force coefficients are switched off to enable the square wave motor to work in a three-phase state, so that the rotating speed of the motor can be continuously increased. At the moment, the reference voltage is selected to be one tenth of the direct-current bus voltage, and comparison is carried out to obtain a counter potential zero-crossing detection signal.
(4) When the motor is decelerated at a three-phase high speed and the rotating speed of the motor is reduced to a threshold value, three-phase windings (R, S and T phases) cut OFF by the motor are connected back again to enable the motor to work in a six-phase winding mode, the duty ratio of PWM is still larger than 50%, the reference voltage still adopts one tenth of the voltage of a direct-current bus by using an H _ PWM _ ON-L _ ON modulation mode, and when the rotating speed of the motor is continuously reduced to the PWM duty ratio lower than 50%, the H _ PWM _ OFF-L _ ON modulation mode is applied, and the reference voltage is selected to be zero voltage.
According to the different rotating speeds and the different three-six phase winding states of the motor, the position sensor-free rotor position detection circuit of the square wave motor is changed. The high and low rotating speeds and the three-six phase working mode are distinguished through DCT signals, so that the system is more complete. The novel counter potential zero-crossing detection method distinguishes the high-speed and low-speed counter potential detection of the motor and distinguishes and treats the three-six phase working mode, so that the counter potential of the motor is more accurately detected, and the motor is prevented from damaging a circuit when running at high speed.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a rotor position detection device of six-phase asymmetric square wave motor, two sets of three-phase inverters of parallelly connected on the DC power supply, one set of three-phase winding is connected respectively to every set of three-phase inverter, its characterized in that includes:
the main control module controls the switching elements in the two sets of three-phase inverters through outputting DCT control signals so as to control the phase change of the motor, and specifically comprises the following steps:
(1) when a six-phase motor is operated under a six-phase winding just after being started, the rotating speed of the motor is lower than a threshold value at the moment, and the PWM duty ratio is smaller than 50%, an H _ PWM _ OFF-L _ ON modulation mode is applied, and the reference voltage is selected as zero voltage at the moment to be compared to obtain a counter potential zero-crossing detection signal;
(2) when the rotating speed of the motor continues to rise and the PWM duty ratio is larger than 50%, an H _ PWM _ ON-L _ ON modulation mode is applied, at the moment, the reference voltage is selected to be one tenth of the direct-current bus voltage, and comparison is carried out to obtain a counter potential zero-crossing detection signal;
(3) when the rotating speed is increased to a threshold value, the three-phase winding with a large back electromotive force coefficient is switched off to enable the square wave motor to work in a three-phase state, so that the rotating speed of the motor can be continuously increased, at the moment, the reference voltage is selected to be one tenth of the voltage of a direct current bus, and comparison is carried out to obtain a back electromotive force zero-crossing detection signal;
(4) when the motor is decelerated at a three-phase high speed, when the rotating speed of the motor is reduced to a threshold value, a three-phase winding cut OFF by the motor is connected back again to enable the motor to work in a six-phase winding mode, the duty ratio of PWM is still larger than 50%, an H _ PWM _ ON-L _ ON modulation mode is used, the reference voltage still selects one tenth of the voltage of a direct-current bus, and when the rotating speed of the motor is continuously reduced to the state that the duty ratio of PWM is lower than 50%, an H _ PWM _ OFF-L _ ON modulation mode is applied, and the reference voltage is selected to be zero voltage;
each non-commutation voltage selector is connected with a three-phase terminal of a corresponding three-phase winding and used for selecting a non-commutation end in each set of three-phase winding and outputting the end voltage;
the two filter circuits are used for respectively filtering the non-commutation end voltages of the two sets of three-phase windings;
the two voltage division circuits are used for respectively dividing the voltage of the two non-commutation ends after the filtering treatment;
the two voltage comparison modules are respectively used for comparing the divided voltage of the two non-commutation ends with a reference voltage so as to output a non-commutation back electromotive force zero-crossing signal;
the main control module processes the counter potential zero-crossing signal of the non-commutation to obtain the position of the rotor, so that the commutation moment of the motor is determined.
2. The device for detecting the rotor position of a six-phase asymmetric square-wave motor according to claim 1, further comprising a reference voltage selection circuit respectively connected to the main control module and the voltage comparison module, wherein the reference voltage selection circuit comprises a first switch, a second switch, an eleventh resistor and a twelfth resistor, wherein the resistance of the eleventh resistor is 9 times that of the twelfth resistor; one end of the eleventh resistor is connected with the positive electrode of the direct-current power supply, and the other end of the eleventh resistor is grounded through the twelfth resistor; one end of the first switch is connected to the intersection point of the eleventh resistor and the twelfth resistor, and the other end of the first switch is connected with the input ends of the two voltage comparison modules respectively; one end of the second switch is connected with the negative electrode of the direct-current power supply, and the other end of the second switch is respectively connected with the input ends of the two voltage comparison modules; the main control module controls the first switch and the second switch to be switched on and switched off so as to output different reference voltages.
3. The rotor position detecting apparatus of a six-phase asymmetric square wave motor according to claim 2, wherein the reference voltage is selected in a manner comprising:
when the motor is in a six-phase working mode and the PWM duty ratio of a DCT control signal output by the main control module is less than 50%, the main control module closes the second switch and keeps the first switch disconnected, and the reference voltage selection circuit selects the reference voltage as zero voltage;
when the motor is in a six-phase working mode and the PWM duty ratio of a DCT control signal output by the main control module is more than 50%, the main control module disconnects the second switch and closes the first switch at the same time, and the reference voltage selection circuit selects the reference voltage as one tenth of the voltage of the direct-current bus;
when the rotating speed of the motor is increased to a certain value, a set of three-phase winding with larger back electromotive force is cut off, the motor operates in a three-phase working mode, the PWM duty ratio of a DCT control signal output by the main control module is larger than 50%, the main control module continuously keeps the second switch disconnected, the first switch is closed, and the reference voltage selection circuit selects the reference voltage to be one tenth of the voltage of the direct-current bus.
4. The rotor position detection device of a six-phase asymmetric square-wave motor according to claim 1, wherein the main control module comprises a DSP chip and a CPLD chip connected to each other, the DSP chip being configured to output a DCT control signal and a control instruction, and process a non-commutation back emf zero-crossing signal to obtain a rotor position; the CPLD chip is used for processing signals and control instructions input and output by the DSP chip.
5. The rotor position detecting apparatus of a six-phase asymmetric square wave motor according to claim 1, wherein the filter circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a third capacitor; the first resistor, the second capacitor and the third resistor are sequentially connected in series between the non-commutation voltage selector and the voltage division circuit; the first capacitor is connected with the second resistor in series and then connected with the second capacitor in parallel; one end of the third capacitor is connected to the intersection point of the third resistor and the voltage division circuit, and the other end of the third capacitor is grounded.
6. The rotor position detecting device of a six-phase asymmetric square-wave motor according to claim 1, wherein the voltage dividing circuit comprises: the filter circuit comprises a seventh resistor, an eighth resistor and a seventh capacitor, wherein one end of the seventh resistor is connected with the filter circuit, the other end of the seventh resistor is grounded through the eighth resistor, the seventh capacitor is connected with the eighth resistor in parallel, the resistance value of the eighth resistor is 4 times that of the seventh resistor, and the resistance value of the tenth resistor is 4 times that of the ninth resistor; after the voltage is divided by the seventh resistor and the eighth resistor, the intersection point of the seventh resistor and the eighth resistor is used as a non-commutation-end voltage output end after voltage division and is connected with the input end of the voltage comparison module.
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| CN114688953A (en) * | 2020-12-30 | 2022-07-01 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing non-inductive BLDC rotor position detection based on MCU detection commutation signal |
| CN113489389B (en) * | 2021-06-22 | 2023-01-03 | 深圳市航顺芯片技术研发有限公司 | Motor three-phase current sampling circuit, method, chip and computer equipment |
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