CN108683381B - Motor and drive control circuit thereof - Google Patents

Motor and drive control circuit thereof Download PDF

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Publication number
CN108683381B
CN108683381B CN201810301722.9A CN201810301722A CN108683381B CN 108683381 B CN108683381 B CN 108683381B CN 201810301722 A CN201810301722 A CN 201810301722A CN 108683381 B CN108683381 B CN 108683381B
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Prior art keywords
signal
driving
phase winding
module
preset time
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CN108683381A (en
Inventor
李延吉
熊倩
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Jiehe Motor Jiangxi Co ltd
CHIAPHUA COMPONENTS (SHENZHEN) Ltd
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Jiehe Motor Jiangxi Co ltd
CHIAPHUA COMPONENTS (SHENZHEN) Ltd
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Publication of CN108683381A publication Critical patent/CN108683381A/en
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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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • 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
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H02P25/092—Converters specially adapted for controlling reluctance motors

Abstract

The invention discloses a motor and a drive control circuit thereof, wherein the drive control circuit of the motor comprises: the position detection module is used for detecting the position of the rotor and outputting a position detection signal; the input end of the control module is connected with the output end of the position detection module and is used for outputting a driving control signal according to the position detection signal; the driving module is characterized in that the input end of the driving module is connected with direct current, the controlled end of the driving module is connected with the output end of the control module, and the output end of the driving module is connected with the first phase winding and the second phase winding and is used for switching on or switching off the connection between the first phase winding or the second phase winding and the direct current according to the driving control signal. The invention controls the current of the winding in a sectionalized way and independently controls the current waveform of each sectionalized zone, so that the winding current can be distributed in the whole acting zone, thereby achieving the purposes of improving the voltage utilization rate and reducing the fluctuation of output torque pulsation.

Description

Motor and drive control circuit thereof
Technical Field
The invention relates to the technical field of motors, in particular to a motor and a driving control circuit thereof.
Background
The switch reluctance motor driving system consists of a switch reluctance motor, a power device, a controller and a position detection sensor, is an electromechanical integrated speed regulating device which is produced by combining the current advanced power electronic technology with a novel motor, and is novel driving equipment which is full of vitality and vigor and has a great development prospect. Among other things, two-phase switched reluctance motors have many distinct advantages: the high-speed motor has the advantages of high rotating speed, simple structure, low cost of the motor and the controller, few connecting wires and large slot space, is convenient for reducing copper loss of windings, has good mechanical strength for the stator due to the large iron core section, is very important for reducing motor noise, does not need a permanent magnet, and has cost advantages compared with a brushless direct current motor. These advantages have led to the widespread use of two-phase switched reluctance motors in fans, cleaners, and hand dryers. A two-phase switched reluctance motor generally includes two phase windings, which may be referred to as a first phase winding and a second phase winding. In the process of energizing phase windings, a current control strategy is adopted to reduce torque pulsation, and the improvement of motor efficiency is an important point of research on a switched reluctance motor driving system.
However, the prior art has the problems that the motor is difficult to control and the working efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a motor and a drive control circuit thereof, and aims to solve the problems that the motor is difficult to control and the working efficiency is low in the prior art.
A first aspect of an embodiment of the present invention provides a drive control circuit of a motor including a rotor, a first phase winding, and a second phase winding; the drive control circuit of the motor includes:
and the position detection module is used for detecting the position of the rotor and outputting a position detection signal.
And the input end of the control module is connected with the output end of the position detection module and is used for outputting a driving control signal according to the position detection signal.
The driving module is connected with the direct current at the input end, the controlled end is connected with the output end of the control module, and the output end is connected with the first phase winding and the second phase winding and used for switching on or switching off the connection between the first phase winding or the second phase winding and the direct current according to a driving control signal.
In one embodiment, the control module outputs a driving control signal to the driving module when detecting that the level of the position detection signal jumps, and the driving module switches between the first phase winding and the direct current conduction or the second phase winding and the direct current conduction.
In one embodiment, the drive control signal includes a first on signal, a second on signal, a first PWM signal, a second PWM signal, a first off signal, and a second off signal.
When the position detection signal is at a first level, the control module is configured to:
and outputting a first conduction signal at a first preset time, wherein the first conduction signal is used for indicating the driving module to conduct the connection between the first phase winding and the direct current.
And outputting the first PWM signal at a second preset time.
And outputting a first turn-off signal at a third preset time, wherein the first turn-off signal is used for indicating the driving module to disconnect the connection between the first phase winding and the direct current.
When the position detection signal is at the second level, the control module is used for:
and outputting a second conduction signal at the first preset time, wherein the second conduction signal is used for indicating the driving module to conduct the connection between the second phase winding and the direct current.
And outputting a second PWM signal at a second preset time.
And outputting a second turn-off signal at a third preset time, wherein the second turn-off signal is used for indicating the driving module to disconnect the connection between the second phase winding and the direct current.
Wherein the first level is different from the second level and is one of a high level or a low level.
In one embodiment, the control module is further configured to:
a position detection signal is received.
And obtaining the period of one rotation of the rotor according to the frequency of the position detection signal.
The period is multiplied by a preset coefficient to obtain a total time, wherein the total time=a first preset time+a second preset time+a third preset time.
In one embodiment, the control module is further configured to:
and calculating the maximum phase current according to the rotating speed of the rotor, wherein the maximum phase current is in inverse proportion to the rotating speed, and the rotating speed is equal to the frequency.
And calculating to obtain a first preset time according to the preset motor winding inductance, the preset driving voltage and the maximum phase current.
And obtaining a preset maximum follow current phase current.
And calculating a third preset time according to the preset motor winding inductance, the preset follow current voltage and the preset maximum follow current phase current.
And subtracting the first preset time and the third preset time from the total time to obtain a second preset time.
In one embodiment, the control module is further configured to:
and obtaining the rotating speed of the rotor according to the frequency of the position detection signal, wherein the rotating speed is equal to the frequency.
And acquiring corresponding first preset time, second preset time and third preset time in a preset lookup table according to the rotating speed.
In one embodiment, the drive module includes a first drive unit and a second drive unit.
The input end of the first driving unit and the input end of the second driving unit are connected together to form an input end of the driving module, the first controlled end and the second controlled end of the first driving unit are in one-to-one correspondence with the first controlled end and the second controlled end of the driving module, the first controlled end and the second controlled end of the second driving unit are in one-to-one correspondence with the third controlled end and the fourth controlled end of the driving module, the first output end and the second output end of the first driving unit are respectively connected with the first end and the second end of the first phase winding in one-to-one correspondence, and the first output end and the second output end of the second driving unit are respectively connected with the first end and the second end of the second phase winding in one-to-one correspondence.
In one embodiment, the first driving unit includes a first switching subunit and a second switching subunit.
The first end of the first switch subunit is an input end of the first driving unit, the second end of the first switch subunit is a first output end of the first driving unit, and the controlled end of the first switch subunit is a first controlled end of the first driving unit.
The first end of the second switch subunit is a second output end of the first driving unit, the second end of the second switch subunit is grounded, and the controlled end of the second switch subunit is a second controlled end of the first driving unit.
In one embodiment, the second driving unit includes a third switching sub-unit and a fourth switching sub-unit.
The first end of the third switch subunit is an input end of the second driving unit, the second end of the third switch subunit is a first output end of the second driving unit, and the controlled end of the third switch subunit is a first controlled end of the second driving unit.
The first end of the fourth switch subunit is a second output end of the second driving unit, the second end of the fourth switch subunit is grounded, and the controlled end of the fourth switch subunit is a second controlled end of the second driving unit.
A second aspect of the embodiments of the present invention provides a motor including a drive control circuit of the motor as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: by controlling the current of the winding in a sectional mode, the current waveform of each sectional section is independently controlled, so that the current of the winding can be distributed in the whole acting section, and the purposes of improving the voltage utilization rate and reducing the fluctuation of output torque pulsation are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a driving control circuit of a motor according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the driving module of FIG. 1 according to an embodiment of the present invention;
fig. 3 is a diagram showing inductance, current and signal waveforms according to an embodiment of the present invention.
Detailed Description
In order to make the present solution better understood by those skilled in the art, the technical solution in the present solution embodiment will be clearly described below with reference to the accompanying drawings in the present solution embodiment, and it is obvious that the described embodiment is an embodiment of a part of the present solution, but not all embodiments. All other embodiments, based on the embodiments in this solution, which a person of ordinary skill in the art would obtain without inventive faculty, shall fall within the scope of protection of this solution.
The term "comprising" in the description of the present solution and the claims and in the above figures, as well as any other variants, means "including but not limited to", intended to cover a non-exclusive inclusion. Furthermore, the terms "first" and "second," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
The motor comprises a rotor, a first phase winding and a second phase winding.
The implementation of the invention is described in detail below with reference to the specific drawings:
fig. 1 shows a structure of a driving control circuit of a motor according to an embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown in detail as follows:
as shown in fig. 1, a driving control circuit for a motor according to an embodiment of the present invention includes:
the position detection module 100 is used for detecting the position of the rotor and outputting a position detection signal.
The input end of the control module 200 is connected to the output end of the position detection module 100, and is configured to output a driving control signal according to the position detection signal.
The driving module 300 has an input terminal connected to the direct current VCC, a controlled terminal connected to the output terminal of the control module 200, and an output terminal connected to the first phase winding and the second phase winding, for switching on or switching off the connection between the first phase winding or the second phase winding and the direct current VCC according to a driving control signal.
In an embodiment of the present invention, a driving control circuit of a motor includes a position detection module 100, a control module 200, and a driving module 300.
The output end of the position detection module 100 is connected with the input end of the control module 200, the output end of the control module 200 is connected with the controlled end of the driving module 300, the input end of the driving module 300 is connected with the direct current VCC, and the output end of the driving module 300 is connected with the first phase winding and the second phase winding.
The position detection module 100 detects the position of the rotor and outputs a position detection signal to the control module 200. The control module 200 outputs a driving control signal to the driving module 300 according to the position detection signal. The driving module 300 turns on or off the connection between the first phase winding or the second phase winding and the direct current VCC according to the driving control signal.
The embodiment of the invention provides a method for controlling the current of a conducting phase in a sectional manner in an ascending section of an inductor, and independently controlling the current waveform of each sectional section, so that the current of a phase winding can be distributed in the whole acting section, thereby achieving the purposes of improving the voltage utilization rate and reducing the fluctuation of output torque pulsation.
The key point of the invention is to segment the phase current waveform of the switched reluctance motor, thereby obtaining better efficiency and smoother torque. The rotor position of the switched reluctance motor is detected by the position detection module 100, and the control module 200 controls the on-off of the driving module 300 according to the position detection signal output by the position detection module 100 so as to control the motor winding current. When the current rises from zero, in order to obtain the maximum current rising rate, a full-voltage output mode is adopted to enable the phase current of the winding to be built as soon as possible, after the winding current is built, the winding current is converted into voltage PWM (Pulse Width Modulation) control to control the waveform of the output current, the waveform of the output phase current is kept relatively stable by adjusting the PWM duty ratio, after the winding power-on time reaches a certain value, the connection with the direct current VCC is disconnected, the winding phase current starts to freewheel and continuously drops to zero, and in the process, the fact that the current is reduced to zero at the same time when the winding inductance is reduced is needed to be ensured. Therefore, the motor phase current can be distributed on the whole working section, the voltage utilization rate is improved, and the output torque pulsation is reduced.
The invention segments the phase current waveform of the switched reluctance motor, so that the phase winding current can be distributed in the whole working region, the motor can run at the optimal efficiency point, the voltage utilization rate is improved, and the torque pulsation is reduced. Therefore, the high-speed two-phase switch reluctance motor can be widely applied to products such as dust collectors, fans, hand dryers and the like.
In one embodiment of the present invention, the control module 200 outputs a driving control signal to the driving module 300 when detecting that the level of the position detection signal jumps, and the driving module 300 switches between the first phase winding and the direct current VCC or the second phase winding and the direct current VCC.
In the present embodiment, the levels of the position detection signals include a high level and a low level.
In this embodiment, after receiving the driving control signal, the driving module 300 performs corresponding switching, and the driving module 300 realizes that the first phase winding is conducted with the direct current VCC or the second phase winding is conducted with the direct current VCC through switching.
In one embodiment, the first phase winding and the second phase winding cannot be simultaneously in conduction with the direct current VCC.
As shown in fig. 2, in one embodiment of the present invention, the driving module 300 of fig. 1 includes a first driving unit 310 and a second driving unit 320.
The input end of the first driving unit 310 and the input end of the second driving unit 320 are connected together to form an input end of the driving module 300, the first controlled end and the second controlled end of the first driving unit 310 are in one-to-one correspondence with the first controlled end and the second controlled end of the driving module 300, the first controlled end and the second controlled end of the second driving unit 320 are in one-to-one correspondence with the third controlled end and the fourth controlled end of the driving module 300, the first output end and the second output end of the first driving unit 310 are respectively connected with the first end and the second end of the first phase winding in one-to-one correspondence, and the first output end and the second output end of the second driving unit 320 are respectively connected with the first end and the second end of the second phase winding in one-to-one correspondence.
As shown in fig. 2, in one embodiment of the present invention, the first driving unit 310 includes a first switching sub-unit and a second switching sub-unit.
The first end of the first switch subunit is an input end of the first driving unit 310, the second end of the first switch subunit is a first output end of the first driving unit 310, and the controlled end of the first switch subunit is a first controlled end of the first driving unit 310.
The first end of the second switch subunit is the second output end of the first driving unit 310, the second end of the second switch subunit is grounded GND, and the controlled end of the second switch subunit is the second controlled end of the first driving unit 310.
As shown in fig. 2, in one embodiment of the present invention, the first switching subunit includes a first switching tube Q1, and the drain, the source, and the gate of the first switching tube Q1 are in one-to-one correspondence with the first end, the second end, and the controlled end of the first switching subunit.
The second switch subunit comprises a second switch tube Q2, and the drain electrode, the source electrode and the grid electrode of the second switch tube Q2 are in one-to-one correspondence with the first end, the second end and the controlled end of the second switch subunit.
In one embodiment, the first switching tube Q1 and the second switching tube Q2 are both MOS tubes.
As shown in fig. 2, in one embodiment of the present invention, the first driving unit 310 further includes a first unidirectional conductive sub-unit and a second unidirectional conductive sub-unit.
The negative electrode of the first unidirectional conduction subunit is connected with the first end of the first switch subunit, and the positive electrode of the first unidirectional conduction subunit is connected with the first end of the second switch subunit.
The positive electrode of the second unidirectional conduction subunit is grounded GND, and the negative electrode of the second unidirectional conduction subunit is connected with the second end of the first switch subunit.
As shown in fig. 2, in one embodiment of the present invention, the first unidirectional conduction subunit includes a first diode D1, and an anode and a cathode of the first diode D1 are respectively in one-to-one correspondence with an anode and a cathode of the first unidirectional conduction subunit.
The second unidirectional conduction subunit comprises a second diode D2, and the anode and the cathode of the second diode D2 are respectively in one-to-one correspondence with the anode and the cathode of the second unidirectional conduction subunit.
As shown in fig. 2, in one embodiment of the present invention, the second driving unit 320 includes a third switching sub-unit and a fourth switching sub-unit.
The first end of the third switch subunit is an input end of the second driving unit 320, the second end of the third switch subunit is a first output end of the second driving unit 320, and the controlled end of the third switch subunit is a first controlled end of the second driving unit 320.
The first end of the fourth switch subunit is the second output end of the second driving unit 320, the second end of the fourth switch subunit is grounded GND, and the controlled end of the fourth switch subunit is the second controlled end of the second driving unit 320.
As shown in fig. 2, in one embodiment of the present invention, the third switching subunit includes a third switching tube Q3, where the drain, source and gate of the third switching tube Q3 are in one-to-one correspondence with the first end, the second end and the controlled end of the third switching subunit.
The fourth switch subunit comprises a fourth switch tube Q4, and the drain electrode, the source electrode and the grid electrode of the fourth switch tube Q4 are in one-to-one correspondence with the first end, the second end and the controlled end of the fourth switch subunit.
In one embodiment, the third switching tube Q3 and the fourth switching tube Q4 are both MOS tubes.
As shown in fig. 2, in one embodiment of the present invention, the second driving unit 320 further includes a third unidirectional conductive sub-unit and a fourth unidirectional conductive sub-unit.
The negative electrode of the third unidirectional conduction subunit is connected with the first end of the third switch subunit, and the positive electrode of the third unidirectional conduction subunit is connected with the first end of the fourth switch subunit.
The positive electrode of the fourth unidirectional conduction subunit is grounded GND, and the negative electrode of the fourth unidirectional conduction subunit is connected with the second end of the fourth switching subunit.
As shown in fig. 2, in one embodiment of the present invention, the third unidirectional conduction subunit includes a third diode D3, and an anode and a cathode of the third diode D3 are respectively in one-to-one correspondence with an anode and a cathode of the third unidirectional conduction subunit.
The fourth unidirectional conduction subunit comprises a fourth diode D3, and the anode and the cathode of the fourth diode D3 are respectively in one-to-one correspondence with the anode and the cathode of the fourth unidirectional conduction subunit.
In one embodiment of the invention, the position detection module 100 includes a photo-detection sensor.
Fig. 3 shows waveforms of the inductor, the current and the signal according to the embodiment of the present invention. Wherein t1 is a first preset time, t2 is a second preset time, t3 is a third preset time, and t is a total time.
Where t=t1+t2+t3.
As shown in fig. 2 and 3, the working principle of the embodiment of the present invention is as follows:
the rotor position is detected by a photoelectric detection sensor, and phase conversion is performed according to the position detection signal output by the photoelectric detection sensor.
When the photoelectric detection sensor outputs a high level, the inductance of the corresponding first phase winding rises, and the inductance of the second phase winding falls. When the photoelectric detection sensor outputs a low level, the inductance of the corresponding first phase winding is reduced, and the inductance of the second phase winding is increased.
The section where the inductance of the motor winding rises is a working section of the motor, the winding is electrified in the section where the inductance of the motor winding rises, and the motor outputs forward torque.
When the position detection signal output by the photoelectric detection sensor is detected to be at a high level, the inductance of the first phase winding rises, the first phase winding is electrified at the moment, and the first switching tube Q1 and the second switching tube Q2 are conducted. The current flows from the direct current VCC, through the first switching tube Q1, the first phase winding, the second switching tube Q2, and then into the ground GND.
When the position detection signal output by the photoelectric detection sensor is detected to be at a low level, the inductance of the second phase winding rises, the second phase winding is electrified at the moment, and the third switching tube Q3 and the fourth switching tube Q4 are conducted. The current flows from the direct current VCC, through the third switching tube Q3, the second phase winding, the fourth switching tube Q4, and then into the ground GND.
The control module 200 performs phase inversion according to the signal of the position detection module 100 output from the position detection module 100, thereby rotating the motor.
Diodes D1, D2, D3 and D4 in fig. 2 provide a freewheeling circuit when the switching tube is open and the winding current is not zero. When the first phase winding is electrified, if the first switching tube Q1 is controlled by adopting the first PWM signal, the first switching tube Q1 is disconnected when the first PWM signal is at the cut-off level, and the first phase winding current flows through the second switching tube Q2 and the second diode D2. If the first switching tube Q1 and the second switching tube Q2 are simultaneously turned off, the first phase winding current freewheels through the first diode D1 and the second diode D2. Similarly, when the second phase winding is energized, the third diode D3 and the fourth diode D4 also play the same role of freewheeling.
In one embodiment of the present invention, the driving control signal includes a first on signal, a second on signal, a first PWM signal, a second PWM signal, a first off signal, and a second off signal.
In one embodiment, when the position detection signal is at the first level, the control module 200 is configured to:
and outputting a first conduction signal at a first preset time, wherein the first conduction signal is used for indicating the driving module 300 to conduct the connection between the first phase winding and the direct current VCC.
And outputting the first PWM signal at a second preset time.
And outputting a first turn-off signal at a third preset time, wherein the first turn-off signal is used for instructing the driving module 300 to disconnect the connection between the first phase winding and the direct current VCC.
In one embodiment, when the position detection signal is at the second level, the control module 200 is configured to:
and outputting a second conduction signal at the first preset time, wherein the second conduction signal is used for indicating the driving module 300 to conduct the connection between the second phase winding and the direct current VCC.
And outputting a second PWM signal at a second preset time.
And outputting a second turn-off signal at a third preset time, wherein the second turn-off signal is used for instructing the driving module 300 to disconnect the connection between the second phase winding and the direct current VCC.
Wherein the first level is different from the second level and is one of a high level or a low level.
In this embodiment, the driving module 300 executes corresponding switching after receiving the driving control signal.
After receiving the first conduction signal, the driving module 300 conducts the connection between the first phase winding and the direct current VCC.
After the driving module 300 receives the first PWM signal, continuous on-off switching of the same frequency is implemented according to the frequency of the first PWM signal.
After receiving the first shutdown signal, the driving module 300 disconnects the first phase winding from the direct current VCC.
After receiving the second conduction signal, the driving module 300 turns on the connection between the second phase winding and the direct current VCC.
After receiving the second PWM signal, the driving module 300 switches on and off connection at the same frequency according to the frequency of the second PWM signal.
After receiving the second turn-off signal, the driving module 300 disconnects the second phase winding from the direct current VCC.
In this embodiment, in the first half cycle of one rotation of the rotor, the position detection signal output by the position detection module 100 is at the first level, and at this time, the control procedure includes: and at a first preset time, the first phase winding and the direct current VCC are conducted, and the first phase winding is electrified to provide forward driving force for the rotor. And controlling the energizing process of the first phase winding in a PWM control mode at a second preset time. And at a third preset time, disconnecting the first phase winding from the direct current VCC, and losing power of the first phase winding.
In the latter half of the rotor rotation, the position detection signal output by the position detection module 100 is at the second level, and at this time, the control procedure includes: and at the first preset time, the second phase winding and the direct current VCC are conducted, and the second phase winding is electrified to provide forward driving force for the rotor. And controlling the electrifying process of the second phase winding in a PWM control mode at a second preset time. And at a third preset time, disconnecting the second phase winding from the direct current VCC, and losing power of the second phase winding.
In one embodiment of the invention, the control module 200 is further configured to:
a position detection signal is received.
And obtaining the period of one rotation of the rotor according to the frequency of the position detection signal.
The period is multiplied by a preset coefficient to obtain a total time, wherein the total time=a first preset time+a second preset time+a third preset time.
In one embodiment, the period is equal to the inverse of the frequency.
In this embodiment, the position detection signal is used to represent the position of the rotor in the motor, and since the rotor rotates repeatedly, the position detection signal jumps once after the rotor rotates once, so the position detection signal is a periodic signal with a fixed frequency. The frequency may also be used to characterize the rotational speed of the rotor. Since the control time for the windings needs to be related to the rotational speed of the rotor, the total time can be derived from the rotational speed.
Wherein the preset coefficient is an empirical value. In one embodiment, the preset coefficient is 4, i.e. period 4 = total time.
In one embodiment of the invention, the control module 200 is further configured to:
and calculating the maximum phase current according to the rotating speed of the rotor, wherein the maximum phase current is in inverse proportion to the rotating speed.
And calculating to obtain a first preset time according to the preset motor winding inductance, the preset driving voltage and the maximum phase current.
And obtaining a preset maximum follow current phase current.
And calculating a third preset time according to the preset motor winding inductance, the preset follow current voltage and the preset maximum follow current phase current.
And subtracting the first preset time and the third preset time from the total time to obtain a second preset time.
In this embodiment, the rotational speed of the rotor is equal to the frequency of the position detection signal.
In this embodiment, according to the formula of the voltage-current relationship between the two ends of the inductance element:the first preset time can be calculated by presetting the motor winding inductance, the preset driving voltage and the maximum phase current; can also be preset byAnd calculating the inductance of the motor winding, the preset follow current voltage and the preset maximum follow current phase current to obtain a third preset time.
The inductance of the preset motor winding is the inductance value of the first phase winding or the second phase winding. The preset driving voltage is the working voltage of the first phase winding or the second phase winding.
In one embodiment of the invention, the control module 200 is further configured to:
and obtaining the rotating speed of the rotor according to the frequency of the position detection signal, wherein the rotating speed is equal to the frequency.
And acquiring corresponding first preset time, second preset time and third preset time in a preset lookup table according to the rotating speed.
In this embodiment, the time distribution is performed by establishing a preset lookup table and querying the power-on time of the first phase winding and the second phase winding at each stage according to the rotation speed of the motor rotor, so that the system calculation can be simplified, the system operation efficiency can be improved, and the control strategy is more accurate and efficient, so that a better control effect can be obtained. The preparation of the preset lookup table is required to be based on the actual parameters and specific working conditions of the motor.
In the embodiment of the present invention, when detecting the jump of the output signal of the corresponding position detecting module 100, the corresponding winding needs to be energized, and the current increases from zero at this time, in order to build up the current as soon as possible to reduce the torque ripple, a full voltage control method is adopted to make the current rise at the maximum rate, which is the first control interval, i.e. the first preset time t1. After the winding current is established, a second section control strategy is adopted, voltage PWM control is adopted in a second preset time t2 in the control interval, the waveform of the winding phase current is controlled to be stable through the adjustment of PWM duty ratio, a third section control is carried out after the second section control is finished, and in the control interval, the switching tube is turned off in a third preset time t3, so that the winding current starts to freewheel until the current is reduced to zero, and the current is zero and keeps synchronous with the maximum value of the winding inductance.
In the segment control of winding current, the control emphasis is the time allocation of the three-segment control strategy, i.e. the time taken by each segment of control. In the present embodiment, the position detection module 100 can be used not only to detect the rotor position, but also to measure the energizing duration of each phase winding-the total time t, i.e. t=t1+t2+t3, which limits the time sum of the three control intervals. The proportion of t1, t2 and t3 can be distributed according to the actual condition of the motor.
In this embodiment, the phase current magnitude is related to the motor speed, with higher speeds leading to higher currents. The rising rate of the phase current depends on the excitation voltage and the winding inductance, and the smaller the inductance, the larger the rising rate of the current is under the premise of a certain excitation voltage. The freewheel time of the phase currents depends on the current at the start of freewheel, the winding inductance and the freewheel voltage.
In the control principle of the present embodiment, the total time t for energizing the motor winding may be calculated according to the output signal of the position detection module 100; the required maximum phase current Imax is then calculated from the desired rotational speed of the motor, and t1 is calculated from the motor winding inductance, the drive voltage and the maximum current Imax. Determining the maximum phase current Ifwmax when starting freewheeling according to the actual application of the motor, and calculating the freewheeling time t3 according to the inductance of the motor winding and the freewheeling voltage; finally, the total time t is subtracted by t1 and t3 to obtain the current modulation time t2.
The embodiment of the invention also provides a motor, which comprises the driving control circuit of the motor.
In one embodiment, the motor is a two-phase switched reluctance motor.
It should be noted that the ports or pins with the same reference numerals in the specification and the drawings of the present invention are connected.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A drive control method of a motor, characterized by being applied to a drive control circuit of a motor including a rotor, a first phase winding and a second phase winding; the drive control circuit of the motor includes:
the position detection module is used for detecting the position of the rotor and outputting a position detection signal;
the input end of the control module is connected with the output end of the position detection module and is used for outputting a driving control signal according to the position detection signal;
the driving module is connected with the direct current at the input end, the controlled end is connected with the output end of the control module, and the output end is connected with the first phase winding and the second phase winding and is used for switching on or switching off the connection between the first phase winding or the second phase winding and the direct current according to the driving control signal;
the driving control signal comprises a first conducting signal, a second conducting signal, a first PWM signal, a second PWM signal, a first turn-off signal and a second turn-off signal;
when the position detection signal is at a first level, the control module is configured to:
outputting the first conduction signal at a first preset time, wherein the first conduction signal is used for indicating the driving module to conduct the connection between the first phase winding and the direct current;
outputting the first PWM signal at a second preset time, and realizing on-off continuous switching of the same frequency according to the frequency of the first PWM signal;
outputting the first turn-off signal at a third preset time, wherein the first turn-off signal is used for indicating the driving module to disconnect the connection between the first phase winding and the direct current;
when the position detection signal is at the second level, the control module is configured to:
outputting a second conduction signal at a first preset time, wherein the second conduction signal is used for indicating the driving module to conduct the connection between the second phase winding and the direct current;
outputting a second PWM signal in a second preset time, and realizing on-off connection switching of the same frequency according to the frequency of the second PWM signal;
outputting a second turn-off signal at a third preset time, wherein the second turn-off signal is used for indicating the driving module to disconnect the connection between the second phase winding and the direct current;
wherein the first level is different from the second level and is one of a high level or a low level;
the control module is further configured to:
obtaining the rotating speed of the rotor according to the frequency of the position detection signal, wherein the rotating speed is equal to the frequency;
acquiring the corresponding first preset time, second preset time and third preset time from a preset lookup table according to the rotating speed;
the driving module comprises a first driving unit and a second driving unit;
the input end of the first driving unit and the input end of the second driving unit are connected together to form the input end of the driving module, the first controlled end and the second controlled end of the first driving unit are in one-to-one correspondence with the first controlled end and the second controlled end of the driving module, the first controlled end and the second controlled end of the second driving unit are in one-to-one correspondence with the third controlled end and the fourth controlled end of the driving module, the first output end and the second output end of the first driving unit are respectively connected with the first end and the second end of the first phase winding in one-to-one correspondence, and the first output end and the second output end of the second driving unit are respectively connected with the first end and the second end of the second phase winding in one-to-one correspondence.
2. The method of controlling driving of a motor according to claim 1, wherein the control module outputs the driving control signal to the driving module when detecting that the level of the position detection signal is hopped, the driving module switching between the first phase winding and the direct current conduction or the second phase winding and the direct current conduction.
3. The drive control method of a motor according to claim 1, wherein the control module is further configured to:
receiving the position detection signal;
obtaining a period of one rotation of the rotor according to the frequency of the position detection signal;
and multiplying the period by a preset coefficient to obtain total time, wherein the total time=the first preset time+the second preset time+the third preset time.
4. A drive control method of a motor according to claim 3, wherein the control module is further configured to:
calculating a maximum phase current according to the rotating speed of the rotor, wherein the maximum phase current is in inverse proportion to the rotating speed, and the rotating speed is equal to the frequency;
calculating to obtain the first preset time according to a preset motor winding inductance, a preset driving voltage and the maximum phase current;
obtaining a preset maximum follow current phase current;
calculating the third preset time according to the preset motor winding inductance, the preset follow current voltage and the preset maximum follow current phase current;
and subtracting the first preset time and the third preset time from the total time to obtain the second preset time.
5. The drive control method of a motor according to claim 1, wherein the first drive unit includes a first switch subunit and a second switch subunit;
the first end of the first switch subunit is an input end of the first driving unit, the second end of the first switch subunit is a first output end of the first driving unit, and the controlled end of the first switch subunit is a first controlled end of the first driving unit;
the first end of the second switch subunit is a second output end of the first driving unit, the second end of the second switch subunit is grounded, and the controlled end of the second switch subunit is a second controlled end of the first driving unit.
6. The drive control method of a motor according to claim 1, wherein the second drive unit includes a third switch subunit and a fourth switch subunit;
the first end of the third switch subunit is an input end of the second driving unit, the second end of the third switch subunit is a first output end of the second driving unit, and the controlled end of the third switch subunit is a first controlled end of the second driving unit;
the first end of the fourth switch subunit is a second output end of the second driving unit, the second end of the fourth switch subunit is grounded, and the controlled end of the fourth switch subunit is a second controlled end of the second driving unit.
7. An electric motor comprising the drive control method of an electric motor according to any one of claims 1 to 6.
CN201810301722.9A 2018-04-04 2018-04-04 Motor and drive control circuit thereof Active CN108683381B (en)

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