CN112260607A - Motor driver, motor speed control method and control system - Google Patents
Motor driver, motor speed control method and control system Download PDFInfo
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- CN112260607A CN112260607A CN202011210804.6A CN202011210804A CN112260607A CN 112260607 A CN112260607 A CN 112260607A CN 202011210804 A CN202011210804 A CN 202011210804A CN 112260607 A CN112260607 A CN 112260607A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000027311 M phase Effects 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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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
- H02P25/04—Single phase motors, e.g. capacitor motors
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
- H02P1/44—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor
- H02P1/445—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor by using additional capacitors switched at start up
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Abstract
The invention provides a motor driver, a motor speed control method and a control system, wherein the motor driver comprises: the communication module is used for acquiring an operation mode instruction; the control module is connected with the communication module and used for determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode; and the motor speed switching module is connected with the control module and used for executing corresponding mode switching by combining the control command. The invention avoids the frequent start-stop operation of the compressor, prolongs the service life of the compressor, and has lower cost compared with the frequency conversion compressor.
Description
Technical Field
The invention belongs to the technical field of motor control, relates to a motor driving method, and particularly relates to a motor driver, a motor speed control method and a motor speed control system.
Background
At present, the compressor in the domestic fixed frequency air conditioner uses single-phase induction motor, single-phase induction motor simple structure easy maintenance, and motor cost is lower, and the durability is good, brings the material benefit for the customer, and the shortcoming is also very obvious simultaneously: because the power supply frequency cannot be changed, the rotating speed of the compressor of the single-phase induction motor is basically unchanged, and the indoor temperature is adjusted by continuously turning on and off the compressor, so that the room temperature is easy to be suddenly cooled and suddenly heated between one on and one off, the sensory experience of customers is poor, the refrigerating capacity rises slowly when the induction motor is turned on every time, and the system has low energy efficiency and needs to consume more electric energy in the process of reaching an ideal value.
As shown in fig. 1, the conventional split-phase single-phase motor is driven by a 220V/50Hz mains supply, and a capacitor is connected in series to an inductive start winding to shift the phase of the current of the start winding and the run winding (working winding). As the phase shift function of the capacitor is obvious, as long as the capacitor with proper capacity is connected in series in the starting winding, the current phase difference of the two windings is close to 90 degrees, the synthesized rotating magnetic field at the moment is close to a circular rotating magnetic field, so that the starting torque is large and the starting current is small.
The inverter air conditioner is generally adopted to achieve the energy-saving effect, but the energy-saving advantage of the inverter air conditioner can be reflected only by long-time non-stop operation, is not in line with the use habits of a part of domestic users, and has higher price compared with a fixed-frequency air conditioner.
Therefore, how to provide a motor driver, a motor speed control method and a motor speed control system to solve the problem that the prior art cannot provide a solution with relatively low cost and relatively energy saving to avoid the defects of frequent start and stop of the compressor, and the like, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a motor driver, a motor speed control method and a motor speed control system, which are used to solve the problem that the prior art cannot provide a relatively low-cost and relatively energy-saving solution to avoid frequent start and stop of a compressor.
To achieve the above and other related objects, an aspect of the present invention provides a motor driver including: the communication module is used for acquiring an operation mode instruction; the control module is connected with the communication module and used for determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode; and the motor speed switching module is connected with the control module and used for executing corresponding mode switching by combining the control command.
In an embodiment of the present invention, the motor speed switching module includes: the first mode switching unit is provided with a control voltage output end so as to output control voltage to enable the connection of alternating current and the compressor to be conducted, and the motor driver operates in the commercial power operation mode; and the second mode switching unit is provided with a control signal output end so as to output a control signal to ensure that the rectification inverter circuit is connected and conducted with the compressor, and the motor driver operates in the rectification inverter driving mode.
In an embodiment of the present invention, the control voltage output terminal is connected to an ac contactor, so that the output control voltage causes the ac contactor to pull in, and causes the ac power to be connected to the compressor; the control signal output end is connected with a relay in the motor driver, so that the output control signal enables the relay to be attracted, and the rectification inverter circuit is connected and conducted with the compressor.
In an embodiment of the present invention, the motor driver further includes: the power supply module is respectively connected with the communication module, the control module and the motor speed switching module and is used for providing a matched power supply for devices to be supplied in the communication module, the control module and the motor speed switching module; the power supply module is provided with a power supply input end, and the power supply input end is connected with an external power supply.
Another aspect of the present invention provides a motor speed control method applied to the motor driver; the motor speed control method includes: acquiring an operation mode instruction; determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode; and executing corresponding mode switching by combining the control instruction.
In an embodiment of the present invention, the step of performing the corresponding mode switching in combination with the control instruction includes: responding to a control instruction corresponding to a commercial power operation mode, outputting a control voltage to enable the connection and conduction of the alternating current and the compressor, and operating the motor driver in the commercial power operation mode; and responding to a control instruction corresponding to the rectification inversion driving mode, outputting a control signal to enable the rectification inversion circuit to be connected and conducted with the compressor, and operating the motor driver in the rectification inversion driving mode.
In an embodiment of the present invention, the step of performing the corresponding mode switching in combination with the control instruction includes: acquiring a control instruction corresponding to a commercial power operation mode, and outputting a control voltage to enable a compressor to output the maximum refrigerating capacity; and when the indoor temperature reaches a preset temperature threshold value, acquiring a control instruction corresponding to the rectification inversion driving mode, and outputting a control signal.
In an embodiment of the present invention, the control signal is a control signal corresponding to a space vector pulse width modulation method; the step of outputting a control signal in response to a control command corresponding to the rectification inversion driving mode comprises: obtaining currents I alpha and I beta of an M-phase winding and an A-phase winding in a compressor motor, and obtaining Id and Iq through park transformation; the Id and the Iq pass through a proportional-integral controller to obtain corresponding outputs Ud and Uq; obtaining the angle theta and the angular speed omega of the motor by a rotor position estimation method; carrying out inverse park transformation on Ud and Uq by combining the angle theta and the angular speed omega to obtain Ualpha and Ubeta; and carrying out inverse Clark conversion on the U alpha and the U beta to obtain the voltage required by the compressor.
A final aspect of the present invention provides a motor speed control system, comprising: the air conditioner external unit and the motor driver; the air conditioner external unit is in communication connection with the motor driver; the air conditioner external unit is used for sending an operation mode instruction to the motor driver; the motor driver is used for acquiring an operation mode instruction sent by the air conditioner external unit; determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode; and executing corresponding mode switching by combining the control instruction.
In an embodiment of the present invention, the motor speed control system further includes: a first terminal block, a first input end of which is connected with the live wire and a second input end of which is connected with the zero wire; the first input end of the first terminal platform is in conduction connection with the first output end, and the second input end of the first terminal platform is in conduction connection with the second output end; a starting capacitor, one end of which is connected with a third output end of the first terminal block, and the third output end is in conduction connection with the first output end; a first input end of the alternating current contactor is connected with a first output end of the first terminal table, a second input end of the alternating current contactor is connected with a second output end of the first terminal table, and a third input end of the alternating current contactor is connected with the other end of the starting capacitor; when the alternating current contactor is attracted, a first input end of the alternating current contactor is in conduction connection with a first output end, a second input end of the alternating current contactor is in conduction connection with a second output end, and a third input end of the alternating current contactor is in conduction connection with a third output end; the contact attraction control end of the alternating current contactor is connected with the control voltage output end of the motor driver; a first input end of the second terminal block is respectively connected with a first output end of the alternating current contactor and an M-phase output end of a rectification inverter circuit in the motor driver, a second input end of the second terminal block is respectively connected with a second output end of the alternating current contactor and a C-phase output end of the rectification inverter circuit in the motor driver, and a third input end of the second terminal block is respectively connected with a third output end of the alternating current contactor and an A-phase output end of the rectification inverter circuit in the motor driver; the first output end of the second section of terminal block is connected with the M of the compressor, the second output end is connected with the C of the compressor, and the third output end is connected with the A of the compressor; and the first input end of the second terminal table is in conduction connection with the first output end, the second input end of the second terminal table is in conduction connection with the second output end, and the third input end of the second terminal table is in conduction connection with the third output end.
As described above, the motor driver, the motor speed control method and the motor speed control system according to the present invention have the following advantageous effects:
because the power supply frequency can not be changed, the rotating speed of the compressor of the single-phase induction motor is basically unchanged, the current situation that the indoor temperature is regulated by continuously starting and stopping the compressor is adopted, when the indoor temperature is too cold or too hot, the rotating speed of the fixed-frequency compressor is controlled, the operating speed of the motor is controlled by switching the commercial power operating mode and the rectification inversion driving mode, the room temperature is regulated by outputting proper cold (heat) quantity, the compressor is prevented from being started and stopped frequently, the energy efficiency of an air conditioning system is improved, the service life of the compressor is prolonged, the cost is lower than that of a variable-frequency compressor, and the energy-saving control method brings benefits to consumers.
Drawings
Fig. 1 is a schematic diagram of a single-phase motor driving circuit in the prior art.
Fig. 2 is a schematic structural connection diagram of a motor driver according to an embodiment of the invention.
Fig. 3 is a circuit diagram of a motor driver according to an embodiment of the invention.
Fig. 4 is a schematic flow chart of a motor speed control method according to an embodiment of the invention.
Fig. 5 is a driving schematic diagram of a rectification inversion mode in an embodiment of the motor speed control method of the present invention.
Description of the element reference numerals
1 Motor driver
11 communication module
12 control module
13 motor speed switching module
131 first mode switching unit
132 second mode switching unit
14 power supply module
2 air conditioner external unit
3 first terminal table
4 starting capacitor
5 AC contactor
6 second terminal table
S41-S43
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The motor speed control method can avoid frequent start-stop operation of the compressor, prolong the service life of the compressor, and simultaneously has lower cost compared with a variable frequency compressor.
The principle and implementation of a motor driver, a motor speed control method, and a motor speed control system according to the present embodiment will be described in detail below with reference to fig. 1 to 5, so that those skilled in the art can understand the motor driver, the motor speed control method, and the motor speed control system according to the present embodiment without creative work.
Please refer to fig. 2, which is a schematic structural connection diagram of a motor driver according to an embodiment of the present invention. As shown in fig. 2, the motor driver 1 includes: a communication module 11, a control module 12, a motor speed switching module 13, and a power module 14.
The communication module 11 is configured to obtain an operation mode instruction.
The control module 12 is connected to the communication module 11, and configured to determine a corresponding control instruction according to the operation mode instruction; and the operation mode corresponding to the operation mode instruction comprises a commercial power operation mode and a rectification inversion driving mode.
The motor speed switching module 13 is connected to the control module 12, and is configured to perform corresponding mode switching in combination with the control command.
In this embodiment, the motor speed switching module 13 includes: a first mode switching unit 131 and a second mode switching unit 132.
Referring to fig. 3, a circuit structure diagram of a motor driver according to an embodiment of the invention is shown. As shown in fig. 3, the first mode switching unit 131 is provided with control voltage outputs (Con1, Con2) to output control voltages to make the connection of the ac power to the compressor conductive, and the motor driver operates in the commercial power operation mode.
Specifically, the control voltage output end is connected with an alternating current contactor 5, so that the output control voltage enables the alternating current contactor to be attracted, and the alternating current is connected and conducted with the compressor.
The second mode switching unit 132 is provided with a control signal output terminal (a relay 1 contact control terminal, a relay 2 contact control terminal, a relay 3 contact control terminal) to output a control signal to switch on the connection of the rectification inverter circuit and the compressor, and the motor driver operates in the rectification inverter driving mode.
Specifically, the control signal output end is connected to a relay in the motor driver, so that the output control signal attracts the relay 1, the relay 2, and the relay 3, and the rectification inverter circuit is connected to the compressor, whereby a C-phase (winding common end) signal, an M-phase (main phase winding) signal, and an a-phase (auxiliary phase winding) signal output by the motor driver 1 are transmitted to the second terminal block 6.
The power module 14 is connected to the communication module 11, the control module 12 and the motor speed switching module 13, and is configured to provide a matched power source to devices to be powered in the communication module, the control module and the motor speed switching module.
The power module 14 is provided with a power input end (a live wire L input end, a zero wire N input end) connected with an external power supply (220V/50 Hz).
Referring to fig. 4, a schematic flow chart of a motor speed control method according to an embodiment of the invention is shown. As shown in fig. 4, the motor speed control method applied to the motor driver specifically includes the following steps:
s41, an operation mode command is obtained.
S42, determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode (220V/50Hz alternating current driven compressor) and a rectification inversion driving mode (the compressor is driven by a driver rectification inversion).
And S43, executing corresponding mode switching in combination with the control command.
In the present embodiment, S43 includes:
(1) responding to a control instruction corresponding to the commercial power operation mode, outputting a control voltage to enable the connection between the alternating current and the compressor to be conducted, and operating the motor driver in the commercial power operation mode.
Specifically, the 220V/50Hz commercial power is input, a capacitor with proper capacity is connected in series with the starting winding, the phase difference of the current of the two windings is close to 90 degrees by means of the phase shifting action of the capacitor, the synthesized rotating magnetic field is close to a circular rotating magnetic field, and the motor rotates, so that the motor runs at the highest rotating speed when the motor is started.
(2) And responding to a control instruction corresponding to the rectification inversion driving mode, outputting a control signal to enable the rectification inversion circuit to be connected and conducted with the compressor, and operating the motor driver in the rectification inversion driving mode.
Furthermore, when the corresponding mode switching is executed by combining the control instruction, the commercial power operation mode is adopted firstly, and then the rectification inversion mode is adopted. The method specifically comprises the following steps: acquiring a control instruction corresponding to a commercial power operation mode, and outputting a control voltage to enable a compressor to output the maximum refrigerating capacity; and when the indoor temperature reaches a preset temperature threshold value, acquiring a control instruction corresponding to the rectification inversion driving mode, and outputting a control signal.
Fig. 5 is a schematic diagram showing a driving principle of a rectification inversion mode in an embodiment of the method for controlling a motor speed according to the present invention. As shown in fig. 5, the control signal is a control signal corresponding to an SVPWM (Space Vector Pulse Width Modulation) method; the step of outputting a control signal in response to a control command corresponding to the rectification inversion driving mode comprises:
(1) and obtaining currents I alpha and I beta of an M-phase winding and an A-phase winding in the compressor motor, and obtaining Id and Iq through PARK conversion. Specifically, when the compressor uses a single-phase induction motor, the current I α and I β of the M-phase winding and the a-phase winding of the motor are obtained through the current sampling resistor, and the sampling voltage converted by the current sampling resistor is transmitted to the control module, for example, the control module is an external circuit required by an MCU (micro controller Unit, a micro control Unit or a single chip microcomputer) and the operation of the single chip microcomputer.
(2) And (3) passing the Id and the Iq through a Proportional Integral Controller (PI Controller) to obtain corresponding outputs Ud and Uq.
(3) And obtaining the angle theta and the angular speed omega of the motor by a rotor position estimation method. The rotor position estimation method is an algorithm for estimating the position of a rotor and acquiring the angle and the angular speed of a motor. In practical application, the angle and the angular speed of the motor can be obtained through the existing motor angle and angular speed algorithm, the angle and the angular speed of the motor can be directly obtained through a sensor, and after relevant parameters are detected through a sensor of the relevant parameters, the relevant parameters are calculated and converted into the angle and the angular speed of the motor.
(4) And carrying out inverse PARK transformation on Ud and Uq by combining the angle theta and the angular speed omega to obtain the Ualpha and the Ubeta.
(5) And carrying out inverse Clarke CLARKE conversion on the Ualpha and the Ubeta to obtain the voltage required by the compressor, namely inputting the actually required three-phase voltage to an inverter driving device for motor driving.
The protection scope of the motor speed control method according to the present invention is not limited to the execution sequence of the steps illustrated in the embodiment, and all the solutions of the prior art including the steps addition, subtraction, and step replacement according to the principle of the present invention are included in the protection scope of the present invention.
Referring to fig. 3, as shown in fig. 3, the motor speed control system according to the present invention includes: the air conditioner comprises a motor driver 1, an air conditioner outer unit (plate) 2, a first terminal platform 3, a starting capacitor 4, an alternating current contactor 5 and a second terminal platform 6; and the air conditioner external unit 2 is in communication connection with the motor driver 1.
The air conditioner external unit 2 is configured to send an operation mode instruction to the motor driver.
The motor driver 1 is used for acquiring an operation mode instruction sent by the air conditioner external unit 2; determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode; and executing corresponding mode switching by combining the control instruction.
The first input end of the first terminal table 3 is connected with a live wire, and the second input end of the first terminal table is connected with a zero wire; the first input end of the first terminal block 3 is connected with the first output end in a conduction mode, and the second input end of the first terminal block is connected with the second output end in a conduction mode.
One end of the starting capacitor 4 is connected to a third output end of the first terminal block 3, and the third output end is connected to the first output end in a conduction manner.
A first input end of the alternating current contactor 5 is connected with a first output end of the first terminal table 3, a second input end of the alternating current contactor is connected with a second output end of the first terminal table 3, and a third input end of the alternating current contactor is connected with the other end of the starting capacitor 4; when the alternating current contactor 5 is attracted, a first input end of the alternating current contactor 5 is in conduction connection with a first output end, a second input end of the alternating current contactor is in conduction connection with a second output end, and a third input end of the alternating current contactor is in conduction connection with a third output end; and the contact attraction control end of the alternating current contactor 5 is connected with the control voltage output ends (Con1, Con2) of the motor driver 1.
A first input end of the second terminal block 6 is connected to a first output end of the ac contactor 5 and an M-phase output end of the rectification inverter circuit in the motor driver 1, a second input end of the second terminal block is connected to a second output end of the ac contactor 5 and a C-phase output end of the rectification inverter circuit in the motor driver 1, and a third input end of the second terminal block is connected to a third output end of the ac contactor 5 and an a-phase output end of the rectification inverter circuit in the motor driver 1; the first output end of the second section of terminal block 6 is connected with M of the compressor, the second output end is connected with C of the compressor, and the third output end is connected with A of the compressor; the first input end of the second terminal platform 6 is connected with the first output end in a conduction mode, the second input end is connected with the second output end in a conduction mode, and the third input end is connected with the third output end in a conduction mode.
With reference to fig. 3, the operation of the motor speed control system according to the present invention is as follows:
when the air conditioner refrigerates, because the difference between the set temperature and the indoor temperature is large, an air conditioner external machine board (a control board of an air conditioner external machine) sends an instruction to a driver to enable the driver to enter a mode 1, the compressor operates at the electric frequency of 50HZ to output the maximum refrigerating capacity, then the indoor temperature is reduced and gradually approaches the set temperature, then the air conditioner external machine control board sends an instruction to the motor driver to enable the motor driver to enter a mode 2, and the compressor is switched between the electric frequencies of 40HZ and 30HZ to maintain the room temperature.
And the communication module of the motor driver receives an instruction from an air conditioner external unit through RS485 communication to determine whether the motor driver operates in the mode 1 or the mode 2.
When entering mode 1: the control module MCU in the motor driver gives control signals to the relays 1, 2 and 3, the relays 1, 2 and 3 are disconnected, then Con1 and Con2 output 220V control voltage, the alternating current contactor is closed, and 220V/50Hz alternating current is input to drive the compressor.
When entering mode 2: the output of Con1 and Con2 is closed by a control module MCU in the motor driver, an alternating current contactor is disconnected, the MCU gives control signals with opposite levels to relays 1, 2 and 3, the relays 1, 2 and 3 are attracted, the driver starts to work and enters a mode 2, and the compressor is driven in a rectification inversion mode.
In summary, the motor driver, the motor speed control method and the motor speed control system of the invention can control the motor running speed by controlling the rotating speed of the fixed-frequency compressor and utilizing the switching between the commercial power running mode and the rectification inversion driving mode when the indoor temperature is too cold or too hot so as to output proper cold (heat) quantity to adjust the room temperature, thereby avoiding frequent start and stop of the compressor, improving the energy efficiency of the air conditioning system, prolonging the service life of the compressor, simultaneously having lower cost than that of the variable-frequency compressor and bringing benefits to consumers. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A motor driver, characterized in that the motor driver comprises:
the communication module is used for acquiring an operation mode instruction;
the control module is connected with the communication module and used for determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode;
and the motor speed switching module is connected with the control module and used for executing corresponding mode switching by combining the control command.
2. The motor driver of claim 1, wherein the motor speed switching module comprises:
the first mode switching unit is provided with a control voltage output end so as to output control voltage to enable the connection of alternating current and the compressor to be conducted, and the motor driver operates in the commercial power operation mode;
and the second mode switching unit is provided with a control signal output end so as to output a control signal to ensure that the rectification inverter circuit is connected and conducted with the compressor, and the motor driver operates in the rectification inverter driving mode.
3. The motor driver according to claim 2,
the control voltage output end is connected with an alternating current contactor so that the output control voltage enables the alternating current contactor to be attracted and enables the alternating current to be connected and conducted with the compressor;
the control signal output end is connected with a relay in the motor driver, so that the output control signal enables the relay to be attracted, and the rectification inverter circuit is connected and conducted with the compressor.
4. The motor driver of claim 1, further comprising:
the power supply module is respectively connected with the communication module, the control module and the motor speed switching module and is used for providing a matched power supply for devices to be supplied in the communication module, the control module and the motor speed switching module;
the power supply module is provided with a power supply input end, and the power supply input end is connected with an external power supply.
5. A motor speed control method, characterized in that the motor speed control method is applied to a motor driver according to any one of claims 1 to 4; the motor speed control method includes:
acquiring an operation mode instruction;
determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode;
and executing corresponding mode switching by combining the control instruction.
6. The motor speed control method of claim 5, wherein the step of performing a respective mode switch in conjunction with the control command comprises:
responding to a control instruction corresponding to a commercial power operation mode, outputting a control voltage to enable the connection and conduction of the alternating current and the compressor, and operating the motor driver in the commercial power operation mode;
and responding to a control instruction corresponding to the rectification inversion driving mode, outputting a control signal to enable the rectification inversion circuit to be connected and conducted with the compressor, and operating the motor driver in the rectification inversion driving mode.
7. The motor speed control method of claim 6, wherein the step of performing a respective mode switch in conjunction with the control command comprises:
acquiring a control instruction corresponding to a commercial power operation mode, and outputting a control voltage to enable a compressor to output the maximum refrigerating capacity;
and when the indoor temperature reaches a preset temperature threshold value, acquiring a control instruction corresponding to the rectification inversion driving mode, and outputting a control signal.
8. The motor speed control method according to claim 6, wherein the control signal is a control signal corresponding to a space vector pulse width modulation method; the step of outputting a control signal in response to a control command corresponding to the rectification inversion driving mode comprises:
obtaining currents I alpha and I beta of an M-phase winding and an A-phase winding in a compressor motor, and obtaining Id and Iq through park transformation;
the Id and the Iq pass through a proportional-integral controller to obtain corresponding outputs Ud and Uq;
obtaining the angle theta and the angular speed omega of the motor by a rotor position estimation method;
carrying out inverse park transformation on Ud and Uq by combining the angle theta and the angular speed omega to obtain Ualpha and Ubeta;
and carrying out inverse Clark conversion on the U alpha and the U beta to obtain the voltage required by the compressor.
9. A motor speed control system, comprising: an outdoor unit of an air conditioner and a motor driver according to any one of claims 1 to 4; the air conditioner external unit is in communication connection with the motor driver;
the air conditioner external unit is used for sending an operation mode instruction to the motor driver;
the motor driver is used for acquiring an operation mode instruction sent by the air conditioner external unit; determining a corresponding control instruction according to the operation mode instruction; the operation modes corresponding to the operation mode instructions comprise a commercial power operation mode and a rectification inversion driving mode; and executing corresponding mode switching by combining the control instruction.
10. The motor speed control system of claim 9, further comprising:
a first terminal block, a first input end of which is connected with the live wire and a second input end of which is connected with the zero wire; the first input end of the first terminal platform is in conduction connection with the first output end, and the second input end of the first terminal platform is in conduction connection with the second output end;
a starting capacitor, one end of which is connected with a third output end of the first terminal block, and the third output end is in conduction connection with the first output end;
a first input end of the alternating current contactor is connected with a first output end of the first terminal table, a second input end of the alternating current contactor is connected with a second output end of the first terminal table, and a third input end of the alternating current contactor is connected with the other end of the starting capacitor; when the alternating current contactor is attracted, a first input end of the alternating current contactor is in conduction connection with a first output end, a second input end of the alternating current contactor is in conduction connection with a second output end, and a third input end of the alternating current contactor is in conduction connection with a third output end; the contact attraction control end of the alternating current contactor is connected with the control voltage output end of the motor driver;
a first input end of the second terminal block is respectively connected with a first output end of the alternating current contactor and an M-phase output end of a rectification inverter circuit in the motor driver, a second input end of the second terminal block is respectively connected with a second output end of the alternating current contactor and a C-phase output end of the rectification inverter circuit in the motor driver, and a third input end of the second terminal block is respectively connected with a third output end of the alternating current contactor and an A-phase output end of the rectification inverter circuit in the motor driver; the first output end of the second section of terminal block is connected with the M of the compressor, the second output end is connected with the C of the compressor, and the third output end is connected with the A of the compressor; and the first input end of the second terminal table is in conduction connection with the first output end, the second input end of the second terminal table is in conduction connection with the second output end, and the third input end of the second terminal table is in conduction connection with the third output end.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011210804.6A CN112260607A (en) | 2020-11-03 | 2020-11-03 | Motor driver, motor speed control method and control system |
| PCT/CN2021/116403 WO2022095575A1 (en) | 2020-11-03 | 2021-09-03 | Motor driver, and motor speed control method and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011210804.6A CN112260607A (en) | 2020-11-03 | 2020-11-03 | Motor driver, motor speed control method and control system |
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| CN112260607A true CN112260607A (en) | 2021-01-22 |
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| CN202011210804.6A Pending CN112260607A (en) | 2020-11-03 | 2020-11-03 | Motor driver, motor speed control method and control system |
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| WO (1) | WO2022095575A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095575A1 (en) * | 2020-11-03 | 2022-05-12 | 上海儒竞智控技术有限公司 | Motor driver, and motor speed control method and control system |
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| WO2022095575A1 (en) | 2022-05-12 |
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