CN113300663A - Driving device of motor and motor system - Google Patents

Driving device of motor and motor system Download PDF

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Publication number
CN113300663A
CN113300663A CN202110722240.2A CN202110722240A CN113300663A CN 113300663 A CN113300663 A CN 113300663A CN 202110722240 A CN202110722240 A CN 202110722240A CN 113300663 A CN113300663 A CN 113300663A
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CN
China
Prior art keywords
permanent magnet
voltage converter
output
magnet motor
motor
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Pending
Application number
CN202110722240.2A
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Chinese (zh)
Inventor
朱鹏程
李明
王少波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wolong Electric Shanghai Central Research Institute Co ltd
Wolong Electric Drive Group Co Ltd
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Wolong Electric Shanghai Central Research Institute Co ltd
Wolong Electric Group Co Ltd
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Priority to CN202110722240.2A priority Critical patent/CN113300663A/en
Publication of CN113300663A publication Critical patent/CN113300663A/en
Pending legal-status Critical Current

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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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/50—Reduction of harmonics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital 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
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses a motor driving device and a motor system, which comprise a voltage converter, an inverter circuit and a digital control circuit, wherein the digital control circuit controls the voltage converter to output a voltage which is positively correlated with the current rotating speed of the rotating speed of a permanent magnet motor based on the rotating speed of the permanent magnet motor, and the inverter circuit converts direct current output by the voltage converter into alternating current capable of driving the permanent magnet motor, so that the permanent magnet motor is driven. Therefore, the voltage output by the voltage converter can be controlled based on the rotating speed of the permanent magnet motor, namely, the voltage converter outputs the voltage which is positively correlated with the counter electromotive force of the permanent magnet motor in the current rotating speed, so that the harmonic wave input into the permanent magnet motor is reduced, and the loss of the permanent magnet motor in the direct current output by the direct current power supply when the ripple voltage exists is reduced.

Description

Driving device of motor and motor system
Technical Field
The invention relates to the field of motor control, in particular to a driving device of a motor and a motor system.
Background
In multi-electric and all-electric aircraft, permanent magnet motors play an important role in the power system, which is capable of driving loads in the aircraft. In addition, when the permanent magnet motor is driven, a conventional driving device of the permanent magnet motor includes a three-phase full bridge circuit, as shown in fig. 1, and fig. 1 is a schematic structural diagram of a driving device of a motor in the prior art. In an aircraft, a drive device obtains electrical energy from a direct current distribution bus and converts direct current into alternating current required by a permanent magnet motor to drive the permanent magnet motor. Because the direct current on the direct current distribution bus usually has ripple voltage, after drive arrangement converted direct current into alternating current, can make permanent-magnet machine produce the harmonic in the alternating current, and drive arrangement can't change the size of the amplitude of ripple in the alternating current of output, also the harmonic in the alternating current of drive arrangement output is also great, can make permanent-magnet machine's loss increase.
Disclosure of Invention
The present invention is directed to a motor driving apparatus and a motor system, which are capable of controlling a voltage output from a voltage converter based on a rotational speed of a permanent magnet motor, that is, enabling the voltage converter to output a voltage that is directly correlated to a counter electromotive force of the permanent magnet motor at a current rotational speed, thereby reducing a harmonic wave input to the permanent magnet motor and reducing a loss of the permanent magnet motor when a ripple voltage is present in a dc current output from a dc power supply.
In order to solve the above technical problem, the present invention provides a driving apparatus of a motor, including:
the voltage converter is used for boosting or reducing the voltage output by the direct-current power supply and outputting direct current;
the inverter circuit is used for inverting the direct current output by the voltage converter into alternating current to drive the permanent magnet motor;
the input with permanent-magnet machine connects digital control circuit for right permanent-magnet machine's rotational speed detects, and based on that detects permanent-magnet machine's rotational speed control voltage converter output with permanent-magnet machine's rotational speed is positive correlation's direct current.
Preferably, the voltage converter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and an inductor;
the first end of the first switching tube is a first input end of the voltage converter and is connected with the first output end of the direct-current power supply, the second end of the first switching tube is connected with the first end of the third switching tube and the first end of the inductor, and the control end of the first switching tube is a first control end of the voltage converter and is connected with the first signal output end of the digital control circuit;
the first end of the second switching tube is a first output end of the voltage converter and is connected with the first input end of the inverter circuit, the second end of the second switching tube is connected with the second end of the inductor, and the control end of the second switching tube is a second control end of the voltage converter and is connected with the first signal output end of the digital control circuit;
the second end of the third switch tube is a second input end of the voltage converter and is connected with the second output end of the direct-current power supply and the second end of the fourth switch tube, and the control end of the third switch tube is a third control end of the voltage converter and is connected with the first signal output end of the digital control circuit;
a first end of the fourth switching tube is connected with a second end of the second switching tube and a second end of the inductor, the second end is a second output end of the voltage converter and is connected with a second output end of the inverter circuit, and a control end is a fourth control end of the voltage converter and is connected with a first signal output end of the digital control circuit;
the digital control circuit is specifically used for controlling the corresponding switch tube in the voltage converter to be switched on or switched off based on the detected rotating speed of the permanent magnet motor so as to control the voltage converter to output direct current which is positively correlated with the rotating speed of the permanent magnet motor.
Preferably, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all metal-oxide semiconductor field effect transistor MOS tubes.
Preferably, the inverter circuit is a three-phase full-bridge circuit provided with a switching tube, and a control end of the three-phase full-bridge circuit is connected with a second signal output end of the digital control circuit;
the digital control circuit is also used for controlling the switching tube in the three-phase full-bridge circuit to be switched on or switched off, so that the three-phase full-bridge circuit is controlled to invert the direct current output by the voltage converter into alternating current to drive the permanent magnet motor.
Preferably, the digital control circuit comprises:
the input end of the digital control circuit is a rotating speed sensor, the input end of the digital control circuit is connected with the permanent magnet motor, and the output end of the digital control circuit is connected with the control module and used for detecting the rotating speed of the permanent magnet motor;
the first signal output end is the digital control circuit's first signal output end with voltage converter's control end is connected control module is used for based on permanent-magnet machine's rotational speed control voltage converter output with permanent-magnet machine's rotational speed is positive correlation's direct current.
Preferably, the permanent magnet motor is in a starting state;
the digital control circuit is specifically configured to control the voltage converter to output a voltage of the direct current to be increased when it is detected that the rotation speed of the permanent magnet motor is increased based on the rotation speed at the previous time, and control the voltage converter to output the direct current of a magnitude corresponding to the rotation speed of the permanent magnet motor when it is detected that the rotation speed of the permanent magnet motor is kept stable based on the rotation speed at the previous time.
Preferably, the method further comprises the following steps:
the motor speed regulating module is connected with the instruction input end of the permanent magnet motor and the instruction input end of the digital control circuit at the output end and is used for outputting a speed regulating instruction so as to change the rotating speed of the permanent magnet motor;
the digital control circuit is specifically used for controlling the voltage converter to output direct current which is positively correlated with the rotating speed corresponding to the speed regulating instruction when the speed regulating instruction is received.
Preferably, the method further comprises the following steps:
and the capacitor with a first end connected with the first output end of the voltage conversion circuit and the first input end of the inverter circuit and a second end connected with the second output end of the voltage conversion circuit and the second input end of the inverter circuit is used for charging when the output voltage of the voltage conversion circuit is increased and discharging when the output voltage of the voltage conversion circuit is reduced.
Preferably, the method further comprises the following steps:
and the filter is used for filtering the direct current output by the direct current power supply, and the input end of the filter is connected with the output end of the direct current power supply, and the output end of the filter is connected with the input end of the voltage converter.
In order to solve the technical problem, the invention provides a motor system, which comprises the motor driving device and a permanent magnet motor, wherein the input end of the permanent magnet motor is connected with the output end of the motor driving device.
The application provides a drive arrangement and motor system of motor, including voltage converter, inverter circuit and digital control circuit, the digital control circuit is based on permanent-magnet machine's rotational speed control voltage converter output and the present rotational speed of permanent-magnet machine's rotational speed is positive correlation's voltage, and inverter circuit carries out driven alternating current to permanent-magnet machine with the direct current conversion of voltage converter output to drive permanent-magnet machine. Therefore, the voltage output by the voltage converter can be controlled based on the rotating speed of the permanent magnet motor, namely, the voltage converter outputs the voltage which is positively correlated with the counter electromotive force of the permanent magnet motor in the current rotating speed, so that the harmonic wave input into the permanent magnet motor is reduced, and the loss of the permanent magnet motor in the direct current output by the direct current power supply when the ripple voltage exists is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a driving apparatus of a motor in the prior art;
fig. 2 is a schematic structural diagram of a driving device of a motor according to the present invention;
fig. 3 is a schematic structural diagram of a voltage converter according to the present invention;
fig. 4 is a schematic structural diagram of a driving device of a motor according to the present invention;
FIG. 5 is a schematic diagram of a control process of the permanent magnet motor provided by the present invention when starting;
FIG. 6 is a schematic diagram of a control process of a permanent magnet motor according to the present invention during speed regulation;
fig. 7 is a schematic structural diagram of a driving apparatus of a motor provided with a filter according to the present invention.
Detailed Description
The core of the invention is to provide a driving device and a motor system of a motor, which can control the voltage output by a voltage converter based on the rotating speed of a permanent magnet motor, namely, the voltage converter outputs the voltage which is in positive correlation with the counter electromotive force of the permanent magnet motor in the current rotating speed, thereby reducing the harmonic wave input into the permanent magnet motor and reducing the loss of the permanent magnet motor when the ripple voltage exists in the direct current output by a direct current power supply.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a driving device of a motor according to the present invention.
The device includes:
the voltage converter 1 is connected with the input end and the first signal output end of the digital control circuit 3, and is used for boosting or reducing the voltage output by the direct-current power supply and outputting direct current;
the inverter circuit 2 is connected with the input end of the voltage converter 1 and the output end of the inverter circuit is connected with the power input end of the permanent magnet motor, and is used for inverting the direct current output by the voltage converter 1 into alternating current to drive the permanent magnet motor;
and the digital control circuit 3 is connected with the permanent magnet motor at the input end and is used for detecting the rotating speed of the permanent magnet motor and controlling the voltage converter 1 to output direct current which is positively correlated with the rotating speed of the permanent magnet motor based on the detected rotating speed of the permanent magnet motor.
In this embodiment, it is considered that the driving device of the permanent magnet motor in the prior art is usually a three-phase full-bridge circuit, and the three-phase full-bridge circuit inverts the direct current output by the direct current power supply to output an alternating current to drive the permanent magnet motor, however, because the direct current in the direct current power supply is generally obtained by rectifying the alternating current, the direct current in the direct current power supply may have a ripple voltage, that is, an alternating current component exists in the direct current output by the direct current power supply, and the three-phase full-bridge circuit in the prior art inverts the direct current having the ripple voltage.
In order to solve the above technical problems, the driving apparatus of the motor in the present application is provided with a voltage converter 1, an inverter circuit 2 and a digital control circuit 3, wherein the voltage converter 1 can convert the alternating current output by the direct current power supply, that is, the voltage output by the direct current power supply is boosted or reduced, the inverter circuit 2 inverts the direct current output by the voltage converter 1 to drive the permanent magnet motor, specifically, the applicant considers that the rotation speed of the permanent magnet motor is in direct proportion to the back electromotive force thereof, the digital control circuit 3 in the present application can detect the rotation speed of the permanent magnet motor and calculate the back electromotive force thereof based on the rotation speed of the permanent magnet motor, so as to control the magnitude of the direct current output by the voltage converter 1 based on the back electromotive force of the permanent magnet motor, thereby the ripple voltage in the direct current output by the voltage converter 1 is also small, so as to ensure that harmonic waves in the alternating current output by the inverter circuit 2 are suppressed, thereby reducing loss.
It should be noted that the voltage conversion circuit in the present application is a dc-dc conversion circuit, and the specific implementation manner is not limited, and the voltage output by the dc power supply can be correspondingly boosted or reduced based on the rotation speed of the permanent magnet motor.
In addition, the input end of the voltage converter 1 in the present application may be directly connected to the dc distribution bus, which is not limited in the present application.
In addition, can set up a plurality of inverter circuit 3 in this application, and the input of each inverter circuit 3 all is connected with voltage converter 1's output, and each inverter circuit 3 parallel connection is to same permanent-magnet machine.
It should be noted that, when the aircraft where the permanent magnet motor is located in the present application decelerates or descends, the rotation speed of the permanent magnet motor decreases, at this time, the permanent magnet motor may serve as a generator to generate electric energy, at this time, the inverter circuit 3 serves as a rectifier circuit to convert the alternating current generated by the permanent magnet motor into direct current, the voltage converter 1 boosts or reduces the direct current output by the inverter circuit 3, so as to feed the direct current back to the direct current power supply, that is, the driving device of the motor in the present application can enable the permanent magnet motor to normally operate in four quadrants. As can be seen, the voltage converter 1 and the inverter circuit 3 in the present application are both capable of realizing bidirectional flow of energy.
In addition, the output voltage of the voltage converter 1 is controlled based on the rotating speed of the permanent magnet motor, so that the more excellent motor control effect on the permanent magnet motor at each speed stage of the permanent magnet motor can be realized, the overspeed capability of the permanent magnet motor is improved, and the capability of the permanent magnet motor when the rotating speed is higher than the rated rotating speed is also improved. Specifically, in the prior art, when the permanent magnet motor is over-speed, the back electromotive force is higher than the rated back electromotive force, and at this time, the voltage of the direct current input to the driving device is lower than the back electromotive force of the permanent magnet motor in the prior art, so that the motor controller cannot control the rotation speed of the permanent magnet motor. In the application, the motor converter 1 can be controlled to be boosted, so that the voltage of the direct current output by the motor converter 1 is always higher than the counter electromotive force of the permanent magnet motor, and the motor controller can continuously control the rotating speed of the permanent magnet motor and limit the trend of the rotating speed of the permanent magnet motor increasing continuously when the permanent magnet motor is overspeed.
In summary, the present application can control the voltage output by the voltage converter 1 based on the rotation speed of the permanent magnet motor, that is, the voltage converter 1 outputs the voltage positively correlated to the counter electromotive force of the permanent magnet motor at the current rotation speed, so as to reduce the harmonic wave input to the permanent magnet motor, and reduce the loss of the permanent magnet motor when the ripple voltage exists in the direct current output by the direct current power supply.
On the basis of the above-described embodiment:
as a preferred embodiment, the voltage converter 1 includes a first switch transistor T1, a second switch transistor T2, a third switch transistor T3, a fourth switch transistor T4 and an inductor;
a first end of the first switch tube T1 is a first input end of the voltage converter 1 and is connected with a first output end of the dc power supply, a second end of the first switch tube T3 and a first end of the inductor are connected, and a control end of the first switch tube T1 is a first control end of the voltage converter 1 and is connected with a first signal output end of the digital control circuit 3;
a first end of the second switching tube T2 is a first output end of the voltage converter 1 and is connected with a first input end of the inverter circuit 2, a second end of the second switching tube T2 is connected with a second end of the inductor, and a control end of the second switching tube T2 is a second control end of the voltage converter 1 and is connected with a first signal output end of the digital control circuit 3;
a second end of the third switching tube T3 is a second input end of the voltage converter 1 and is connected with a second output end of the direct-current power supply and a second end of the fourth switching tube T4, and a control end is a third control end of the voltage converter 1 and is connected with a first signal output end of the digital control circuit 3;
a first end of the fourth switching tube T4 is connected to a second end of the second switching tube T2 and a second end of the inductor, the second end is a second output end of the voltage converter 1 and is connected to a second output end of the inverter circuit 2, and the control end is a fourth control end of the voltage converter 1 and is connected to a first signal output end of the digital control circuit 3;
the digital control circuit 3 is specifically configured to control the corresponding switching tube in the voltage converter 1 to be turned on or off based on the detected rotation speed of the permanent magnet motor, so as to control the voltage converter 1 to output a direct current positively correlated to the rotation speed of the permanent magnet motor.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a voltage converter according to the present invention, in the present embodiment, a voltage converter 1 is provided with a first switching tube T1, a second switching tube T2, a third switching tube T3, a fourth switching tube T4 and an inductor, and a digital control circuit 3 controls on and off of each switching tube based on a current rotation speed of a permanent magnet motor, so as to control the voltage converter 1 to output a direct current corresponding to the rotation speed of the permanent magnet motor, that is, output a direct current positively correlated to a back electromotive force of the permanent magnet motor, so that an inverter circuit 2 outputs a corresponding alternating current to the permanent magnet motor, thereby reducing loss of the permanent magnet motor.
Specifically, the voltage converter 1 can boost the input dc power, i.e., output the dc power UinvCommand electric U greater than inputbusIt is also possible to step down the input dc, i.e. to have the output dc UinvLess than input command Ubus。
It should be noted that the digital control circuit 3 in the present application can control each switching tube in the voltage converter 1 to be turned on at a zero voltage, so as to reduce the loss of the switching tube, improve the switching frequency of the switching tube, and improve the power density of the output power of the voltage converter.
In a preferred embodiment, the first switch Transistor T1, the second switch Transistor T2, the third switch Transistor T3 and the fourth switch Transistor T4 are all MOS transistors (Metal-Oxide-Semiconductor Field-Effect transistors).
Each switching tube in the voltage converter 1 in this application is the MOS pipe, not only can be through self turn-off and switch on make voltage converter 1 output and permanent-magnet machine present back electromotive force be positive relevant direct current, still have simple structure, easily controlled characteristics.
Of course, each switching transistor in the present application is not limited to a MOS transistor, and may be a power semiconductor switching device capable of controlling the magnitude of the dc power output from the voltage converter 1.
As a preferred embodiment, the inverter circuit 2 is a three-phase full-bridge circuit provided with a switching tube, and a control end of the three-phase full-bridge circuit is connected with a second signal output end of the digital control circuit 3;
the digital control circuit 3 is also used for controlling the switching tubes in the three-phase full-bridge circuit to be switched on or off, so as to control the three-phase full-bridge circuit to invert the direct current output by the voltage converter 1 into alternating current to drive the permanent magnet motor.
Referring to fig. 4, fig. 4 is a specific structural schematic diagram of a motor driving device according to the present invention, in this embodiment, the inverter circuit 2 is a three-phase full-bridge circuit, and the digital control circuit 3 controls on and off of a switching tube in the three-phase full-bridge circuit to invert the direct current output by the voltage converter 1 by the three-phase full-bridge circuit, so as to continuously control an amplitude of the alternating current output by the three-phase full-bridge circuit, so as to drive the permanent magnet motor.
Of course, the inverter circuit 2 in the present application is not limited to a three-phase full bridge circuit, and may be configured to invert a direct current.
In addition, the switching tubes in the three-phase full-bridge circuit in the present application may be, but are not limited to, MOS tubes.
As a preferred embodiment, the digital control circuit 3 includes:
the input end of the digital control circuit 3 is connected with the permanent magnet motor, and the output end of the digital control circuit is connected with the control module;
the first signal output end is a control module which is connected with the first signal output end of the digital control circuit 3 and the control end of the voltage converter 1 and is used for controlling the voltage converter 1 to output direct current which is positively correlated with the rotating speed of the permanent magnet motor based on the rotating speed of the permanent magnet motor.
The digital control circuit 3 in this embodiment is provided with a rotation speed sensor and a control module, and the rotation speed sensor can detect the rotation speed of the permanent magnet motor, so that the control module controls the size of the direct current output by the voltage converter 1 and controls the inverter circuit 2, thereby reducing the loss of the permanent magnet motor.
As a preferred embodiment, the permanent magnet motor is in a starting state;
the digital control circuit 3 is specifically configured to control the voltage converter 1 to output a dc voltage increase when it is detected that the rotational speed of the permanent magnet motor increases based on the rotational speed at the previous time, and to control the voltage converter 1 to output a dc voltage having a magnitude corresponding to the rotational speed of the permanent magnet motor when it is detected that the rotational speed of the permanent magnet motor remains stable based on the rotational speed at the previous time.
In this embodiment, when the permanent magnet motor is in a starting state, the rotation speed of the permanent magnet motor increases from 0 to a preset rotation speed, so that the digital control circuit 3 controls the direct current output by the voltage converter 1 to increase correspondingly when the rotation speed of the permanent magnet motor is in an increasing state, and controls the direct current output by the voltage converter 1 to be the direct current corresponding to the current rotation speed of the permanent magnet motor when the rotation speed of the permanent magnet motor is stable, so as to ensure that the counter electromotive force in the permanent magnet motor can suppress the harmonic of the input alternating current and reduce the loss. Please refer to fig. 5 for a relationship between a rotation speed of the permanent magnet motor, a voltage of the direct current output by the voltage converter 1, and a back electromotive force of the permanent magnet motor, where fig. 5 is a schematic diagram of a control process when the permanent magnet motor is started according to the present invention, a curve 1 in fig. 5 is the rotation speed of the permanent magnet motor, a curve 2 is the voltage of the direct current output by the voltage converter 1, and a curve 3 is the back electromotive force of the permanent magnet motor.
As a preferred embodiment, the method further comprises the following steps:
the motor speed regulating module is connected with the instruction input end of the permanent magnet motor and the instruction input end of the digital control circuit 3 at the output end and is used for outputting a speed regulating instruction so as to change the rotating speed of the permanent magnet motor;
the digital control circuit 3 is specifically configured to control the voltage converter 1 to output a direct current having a positive correlation with the rotational speed corresponding to the speed regulation command when it is detected that the rotational speed of the permanent magnet motor has increased based on the rotational speed at the previous time, and to control the voltage converter 1 to output a direct current having a positive correlation with the rotational speed corresponding to the speed regulation command when it is detected that the rotational speed of the permanent magnet motor has decreased based on the rotational speed at the previous time and has decreased to the rotational speed corresponding to the speed regulation command.
In this embodiment, when the permanent magnet motor is in a speed regulation state, that is, when the motor speed regulation module outputs a speed regulation instruction, two changes exist in the rotation speed of the permanent magnet motor, one is a rotation speed increase, and the other is a rotation speed decrease. When the rotating speed of the permanent magnet motor is increased, the digital control circuit 3 controls the voltage converter 1 to output direct current with the magnitude increased to a preset voltage value; when the rotating speed of the permanent magnet motor is reduced, the digital control circuit 3 controls the direct current output by the voltage converter 1 to be reduced, and when the rotating speed of the permanent magnet motor is reduced to the instruction rotating speed and does not change any more, the direct current output by the voltage converter 1 is controlled to be reduced to the direct current corresponding to the current rotating speed of the permanent magnet motor, so that the harmonic wave of the input alternating current is restrained, and the loss is reduced. Referring to fig. 6, fig. 6 is a schematic diagram of a control process of the permanent magnet motor during speed regulation, where in fig. 6, a curve 1 is a rotation speed of the permanent magnet motor, a curve 2 is a voltage of the direct current output by the voltage converter 1, and a curve 3 is a counter electromotive force of the permanent magnet motor.
As a preferred embodiment, the method further comprises the following steps:
and the capacitor C, the first end of which is connected with the first output end of the voltage conversion circuit and the first input end of the inverter circuit 2, and the second end of which is connected with the second output end of the voltage conversion circuit and the second input end of the inverter circuit 2, is used for charging when the output voltage of the voltage conversion circuit is increased and discharging when the output voltage of the voltage conversion circuit is reduced.
A capacitor C is further disposed between the voltage conversion circuit and the inverter circuit 2 in this embodiment, so that the voltage input to the inverter circuit 2 is stable, and the normal operation of the inverter circuit 2, that is, the normal operation of the permanent magnet motor, is ensured.
As a preferred embodiment, the method further comprises the following steps:
and the filter 4 is used for filtering the direct current output by the direct current power supply, and has an input end connected with the output end of the direct current power supply and an output end connected with the input end of the voltage converter 1.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a driving apparatus of a motor with a filter according to the present invention. In this embodiment, a filter 4 is further disposed between the dc power supply and the voltage converter 1, and can filter ripple voltage in the dc power output by the dc power supply, thereby further ensuring that loss of the permanent magnet motor is reduced.
The filter 4 may be, but is not limited to, an EMI (Electromagnetic Interference) filter, and may be configured to filter the dc power input to the voltage converter 1.
In order to solve the technical problem, the invention provides a motor system, which comprises the above motor driving device and a permanent magnet motor with an input end connected with an output end of the motor driving device.
The motor system in this application has the same beneficial effect with the drive arrangement of above-mentioned motor, and this application is no longer repeated.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A drive device of a motor, characterized by comprising:
the voltage converter is used for boosting or reducing the voltage output by the direct-current power supply and outputting direct current;
the inverter circuit is used for inverting the direct current output by the voltage converter into alternating current to drive the permanent magnet motor;
the input with permanent-magnet machine connects digital control circuit for right permanent-magnet machine's rotational speed detects, and based on that detects permanent-magnet machine's rotational speed control voltage converter output with permanent-magnet machine's rotational speed is positive correlation's direct current.
2. The driving apparatus of an electric motor according to claim 1, wherein the voltage converter includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, and an inductor;
the first end of the first switching tube is a first input end of the voltage converter and is connected with the first output end of the direct-current power supply, the second end of the first switching tube is connected with the first end of the third switching tube and the first end of the inductor, and the control end of the first switching tube is a first control end of the voltage converter and is connected with the first signal output end of the digital control circuit;
the first end of the second switching tube is a first output end of the voltage converter and is connected with the first input end of the inverter circuit, the second end of the second switching tube is connected with the second end of the inductor, and the control end of the second switching tube is a second control end of the voltage converter and is connected with the first signal output end of the digital control circuit;
the second end of the third switch tube is a second input end of the voltage converter and is connected with the second output end of the direct-current power supply and the second end of the fourth switch tube, and the control end of the third switch tube is a third control end of the voltage converter and is connected with the first signal output end of the digital control circuit;
a first end of the fourth switching tube is connected with a second end of the second switching tube and a second end of the inductor, the second end is a second output end of the voltage converter and is connected with a second output end of the inverter circuit, and a control end is a fourth control end of the voltage converter and is connected with a first signal output end of the digital control circuit;
the digital control circuit is specifically used for controlling the corresponding switch tube in the voltage converter to be switched on or switched off based on the detected rotating speed of the permanent magnet motor so as to control the voltage converter to output direct current which is positively correlated with the rotating speed of the permanent magnet motor.
3. The motor driving apparatus as claimed in claim 2, wherein the first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor are all metal-oxide semiconductor field effect transistors (MOS) transistors.
4. The driving apparatus of the motor according to claim 1, wherein the inverter circuit is a three-phase full bridge circuit having a switching tube, and a control terminal of the three-phase full bridge circuit is connected to the second signal output terminal of the digital control circuit;
the digital control circuit is also used for controlling the switching tube in the three-phase full-bridge circuit to be switched on or switched off, so that the three-phase full-bridge circuit is controlled to invert the direct current output by the voltage converter into alternating current to drive the permanent magnet motor.
5. The driving apparatus of the motor according to claim 1, wherein the digital control circuit comprises:
the input end of the digital control circuit is a rotating speed sensor, the input end of the digital control circuit is connected with the permanent magnet motor, and the output end of the digital control circuit is connected with the control module and used for detecting the rotating speed of the permanent magnet motor;
the first signal output end is the digital control circuit's first signal output end with voltage converter's control end is connected control module is used for based on permanent-magnet machine's rotational speed control voltage converter output with permanent-magnet machine's rotational speed is positive correlation's direct current.
6. The drive device of an electric motor according to claim 1, wherein said permanent magnet motor is in a starting state;
the digital control circuit is specifically configured to control the voltage converter to output a voltage of the direct current to be increased when it is detected that the rotation speed of the permanent magnet motor is increased based on the rotation speed at the previous time, and control the voltage converter to output the direct current of a magnitude corresponding to the rotation speed of the permanent magnet motor when it is detected that the rotation speed of the permanent magnet motor is kept stable based on the rotation speed at the previous time.
7. The driving apparatus of the motor according to claim 1, further comprising:
the motor speed regulating module is connected with the instruction input end of the permanent magnet motor and the instruction input end of the digital control circuit at the output end and is used for outputting a speed regulating instruction so as to change the rotating speed of the permanent magnet motor;
the digital control circuit is specifically configured to control the voltage converter to output a direct current that is positively correlated with a rotational speed corresponding to the speed regulation instruction when detecting that the rotational speed of the permanent magnet motor increases based on the rotational speed at the previous time, and to control the voltage converter to output a direct current that is positively correlated with a rotational speed corresponding to the speed regulation instruction when detecting that the rotational speed of the permanent magnet motor decreases based on the rotational speed at the previous time and decreases to the rotational speed corresponding to the speed regulation instruction.
8. The driving apparatus of the motor according to claim 1, further comprising:
and the capacitor with a first end connected with the first output end of the voltage conversion circuit and the first input end of the inverter circuit and a second end connected with the second output end of the voltage conversion circuit and the second input end of the inverter circuit is used for charging when the output voltage of the voltage conversion circuit is increased and discharging when the output voltage of the voltage conversion circuit is reduced.
9. The drive device of the motor according to any one of claims 1 to 8, further comprising:
and the filter is used for filtering the direct current output by the direct current power supply, and the input end of the filter is connected with the output end of the direct current power supply, and the output end of the filter is connected with the input end of the voltage converter.
10. A motor system comprising a drive for a motor according to any one of claims 1-9, and further comprising a permanent magnet motor having an input connected to an output of the drive for the motor.
CN202110722240.2A 2021-06-28 2021-06-28 Driving device of motor and motor system Pending CN113300663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110722240.2A CN113300663A (en) 2021-06-28 2021-06-28 Driving device of motor and motor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110722240.2A CN113300663A (en) 2021-06-28 2021-06-28 Driving device of motor and motor system

Publications (1)

Publication Number Publication Date
CN113300663A true CN113300663A (en) 2021-08-24

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Family Applications (1)

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CN202110722240.2A Pending CN113300663A (en) 2021-06-28 2021-06-28 Driving device of motor and motor system

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117200576A (en) * 2023-11-08 2023-12-08 深圳市方利来科技有限公司 Voltage stabilizing control optimizing system for tooth flusher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117200576A (en) * 2023-11-08 2023-12-08 深圳市方利来科技有限公司 Voltage stabilizing control optimizing system for tooth flusher

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