A phase control device, method and motor for an electric motor

Abstract

The application discloses a phase control device and method of a motor and the motor, and the device comprises a VSP speed regulation instruction receiving unit of the rotating speed of the motor, which receives the VSP speed regulation instruction of the rotating speed of the motor; a state switch unit, which determines the speed rising slope of the rotating speed of the motor according to the VSP speed regulation instruction; a lead angle control unit, which determines the lead angle of the rotating speed of the motor according to the VSP speed regulation instruction and the speed rising slope; and a main control unit, which determines the lead phase of the lead angle according to the VSP speed regulation instruction and the lead angle, so as to control the rotating speed of the motor according to the lead phase of the lead angle. According to the scheme, the phase current of the motor is made to lead a small phase at a low rotating speed section and to lead a large phase at a high rotating speed section, so that the electromagnetic noise of the motor during the operation at the low rotating speed section can be at least reduced, and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motor control, and particularly relates to a phase control device, method and motor of a motor, in particular to a phase control device, method and motor of a brushless direct current motor based on a variable slope circuit. BACKGROUND

[0002] In the field of motors and their control, efficiency and noise are important indicators for measuring the performance of motor products. It is costly and time-consuming to improve the above performance indicators from the structure of the motor itself, so the control is usually improved.

[0003] Since the motor is a resistance-inductance load, when an excitation voltage is applied to both ends of the given sub-coil, the phase current will slowly rise to the target value. By controlling the phase current to lead the phase of the counter-electromotive force, the two phases are the same. At this time, the motor output power is maximum, and the optimal output efficiency is achieved. The lead angle control method in the related scheme has a fixed lead angle control and a lead angle control following the change of the speed regulation signal (VSP). Since the air conditioner fan blades have a swing blowing condition (i.e. variable load condition), the fixed lead angle cannot meet the demand of outputting maximum power under different speeds and different loads. The most widely used method in the lead angle control method following the change of VSP is to linearly follow the speed command VSP signal. When measured, this scheme will have a large speed fluctuation in the low speed section. It is directly reflected in the increase of motor electromagnetic noise, which will directly affect the user experience.

[0004] The above content is only used to assist in understanding the technical solutions of the application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The purpose of the present application is to provide a phase control device, method and motor of a motor, to solve the problem that in the lead angle control method of the motor, the lead angle control method following the change of VSP is to linearly follow the speed command VSP signal, and the speed fluctuation is large in the low speed section, which makes the motor electromagnetic noise large and affects the user experience. The effect of improving the user experience is achieved by making the phase current of the motor lead a small phase in the low speed section and a large phase in the high speed section in the lead angle control method following the change of VSP.

[0006] The application provides a phase control device of a motor, comprising a VSP speed regulation instruction receiving unit, a state switch unit, a lead angle control unit and a master control unit; wherein the VSP speed regulation instruction receiving unit is configured to receive a VSP speed regulation instruction of a rotating speed of the motor; the state switch unit is configured to determine a speed rising slope of the rotating speed of the motor according to the VSP speed regulation instruction of the rotating speed of the motor; the lead angle control unit is configured to determine a lead angle of the rotating speed of the motor according to the VSP speed regulation instruction of the rotating speed of the motor and the speed rising slope of the rotating speed of the motor; and the master control unit is configured to determine a lead phase of the lead angle of the rotating speed of the motor according to the VSP speed regulation instruction of the rotating speed of the motor and the lead angle of the rotating speed of the motor, so as to control the rotating speed of the motor according to the lead phase of the lead angle of the rotating speed of the motor.

[0007] In some embodiments, the VSP speed regulation instruction receiving unit comprises a signal receiving port, a current limiting module and a signal output port; wherein the VSP speed regulation instruction receiving unit receives the VSP speed regulation instruction of the rotating speed of the motor, which comprises that after the signal receiving port receives the VSP speed regulation instruction of the rotating speed of the motor, the VSP speed regulation instruction is limited by the current limiting module and then output to the input end of the state switch unit, the first input end of the lead angle control unit and the VSP port of the master control unit respectively through the signal output port.

[0008] In some embodiments, the state switch unit comprises a first voltage dividing module, a second voltage dividing module and a switch tube module; wherein the VSP speed regulation instruction received by the VSP speed regulation instruction receiving unit is connected to ground through the first voltage dividing module and the second voltage dividing module; the common end of the first voltage dividing module and the second voltage dividing module is connected to the control end of the switch tube module; the first connection end of the switch tube module, as the output end of the state switch unit, is connected to the second input end of the advance angle control unit; the second connection end of the switch tube module is connected to ground; the state switch unit determines the speed rising slope of the motor speed according to the VSP speed regulation instruction of the motor speed, comprising: the first voltage dividing module and the second voltage dividing module are configured to divide the VSP speed regulation voltage corresponding to the VSP speed regulation instruction of the motor speed to obtain the voltage dividing value of the VSP speed regulation voltage; the switch tube module is configured to determine the speed rising slope of the motor speed based on the voltage dividing value of the VSP speed regulation voltage, in the case that the voltage dividing value of the VSP speed regulation voltage is greater than or equal to the conduction threshold of the switch tube module itself, the switch tube module itself is turned on to determine the first speed slope of the speed rising slope of the motor speed; in the case that the voltage dividing value of the VSP speed regulation voltage is less than the conduction threshold of the switch tube module itself, the switch tube module itself is turned off to determine the second speed slope of the speed rising slope of the motor speed; wherein the first speed slope is greater than the second speed slope.

[0009] In some embodiments, by adjusting the voltage dividing ratio of the first voltage dividing module and the second voltage dividing module, the variation time of the first speed slope or the second speed slope can be adjusted.

[0010] In some embodiments, the state switch unit further comprises a filtering module; wherein the filtering module is arranged between the control end of the switch tube module and the second connection end of the switch tube module, and is configured to filter the voltage dividing value of the VSP speed regulation voltage before inputting it to the control end of the switch tube module.

[0011] In some embodiments, the lead angle control unit comprises a third voltage dividing module, a fourth voltage dividing module and a voltage boosting module; wherein the output end of the state switch unit is connected to the PCT port of the main control unit via the third voltage dividing module and is grounded via the fourth voltage dividing module; the voltage boosting module is connected between the PC port of the main control unit and the ground; the lead angle control unit determines the lead angle of the motor speed according to the VSP speed regulation instruction of the motor speed and the speed rise slope of the motor speed, comprising: the third voltage dividing module and the fourth voltage dividing module are configured to divide the VSP speed regulation instruction of the motor speed and the speed rise slope of the motor speed to obtain a voltage dividing value of the speed rise slope as the lead angle bias voltage of the motor speed; the voltage boosting module is configured to generate the lead angle control voltage of the motor speed; wherein the lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed form the lead angle of the motor speed.

[0012] In some embodiments, when the VSP speed regulation voltage corresponding to the VSP speed regulation instruction of the motor speed reaches the target voltage value, the maximum value of the lead angle of the motor speed can be adjusted by adjusting the voltage dividing ratio of the third voltage dividing module and the voltage boosting module.

[0013] In some embodiments, the main control unit comprises a VSP instruction module and a phase control module; wherein the main control unit determines the lead angle phase of the motor speed according to the VSP speed regulation instruction of the motor speed and the lead angle of the motor speed, comprising: the VSP instruction module has a VSP port; after the VSP instruction module receives the VSP speed regulation instruction of the motor speed from the VSP port, it is transmitted to the phase control module; the phase control module has a PCT port and a PC port; when the lead angle of the motor speed is formed by the lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed, the phase control module receives the lead angle bias voltage of the motor speed from the PCT port and the lead angle control voltage of the motor speed from the PC port, and then calculates the lead angle phase control voltage of the motor speed based on the VSP speed regulation voltage corresponding to the VSP speed regulation instruction of the motor speed, the lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed; and the lead angle phase control voltage of the motor speed is analog-to-digital converted, and the result of the analog-to-digital conversion is taken as the lead angle phase of the motor speed.

[0014] In another aspect, the present application provides a motor, comprising the phase control device of the present application.

[0015] In another aspect, the present application provides a phase control method of a motor, comprising: a VSP speed adjustment instruction receiving unit for receiving a VSP speed adjustment instruction of a motor; a control state switch unit for determining a speed rising slope of the motor according to the VSP speed adjustment instruction of the motor; a lead angle control unit for determining a lead angle of the motor according to the VSP speed adjustment instruction of the motor and the speed rising slope of the motor; and a main control unit for determining a lead phase of the motor according to the VSP speed adjustment instruction of the motor and the lead angle of the motor, so as to control the speed of the motor according to the lead phase of the motor.

[0016] Therefore, the present application sets a variable slope circuit based on the VSP voltage speed regulation instruction of the motor, the variable slope circuit comprises a state switch circuit and a lead angle control circuit, the state switch circuit is controlled by the VSP voltage speed regulation instruction, and then the lead angle control circuit is controlled, so as to change the lead phase of the lead angle control module in the control unit, and the lead angle compensation value set by the control unit is not exceeded, so that the motor operates at different speed slopes under different VSP voltage speed regulation instructions, and the phase current of the motor is small at a low speed stage and large at a high speed stage, at least the electromagnetic noise of the motor during the operation at the low speed stage is reduced, and the use experience of the user is improved.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application.

[0018] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of the phase control device of the motor of the present application;

[0020] Figure 2 FIG. 2 is a structural schematic diagram of an embodiment of the variable slope circuit of the present application;

[0021] Figure 3 FIG. 3 is a structural schematic diagram of an embodiment of the phase control device based on the variable slope circuit of the present application;

[0022] Figure 4 A curve diagram of the VSP voltage speed regulation instruction-lead angle relationship of the application;

[0023] Figure 5 A flow diagram of an embodiment of the phase control method of the motor of the application. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the application clearer, the technical solutions of the application will be described clearly and completely below in combination with specific embodiments of the application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0025] In the lead angle control method of the motor, the lead angle control method following the change of VSP is the lead angle linearly following the speed instruction VSP signal, and the speed fluctuation is large in the low speed section, so that the electromagnetic noise of the motor is large, which affects the user experience. The industry urgently needs to design a scheme of small lead angle in the low speed section and large lead angle in the high speed section of the phase current, so as to improve the problem of large electromagnetic noise of the motor in the low speed section during operation in the application of the lead angle control method following the change of VSP in the related scheme.

[0026] In addition, considering that the lead angle control method following the change of VSP in the related scheme adopts a single slope rising change of the lead angle, this method will cause the phase current lead angle of the motor to be too large in the high speed working condition, and then the motor frequently commutates, and the frequent switching of the power device causes the temperature rise of the motor controller to be too high.

[0027] Therefore, the scheme of the application provides a phase control scheme of a motor, in particular, a phase control scheme based on a variable slope circuit in a brushless direct current motor.

[0028] According to the embodiments of the application, a phase control device of a motor is provided. Referring to Figure 1 The structure schematic diagram of an embodiment of the device of the application is shown. The phase control device of the motor can include a VSP speed regulation instruction receiving unit, a state switching unit, a lead angle control unit and a main control unit; the VSP speed regulation instruction receiving unit is a VSP speed regulation instruction receiving circuit as shown in Figure 2 and Figure 3 The VSP speed regulation instruction receiving circuit, the state switching unit is a VSP-based state switching circuit as shown in Figure 2 and Figure 3 The VSP-based state switching circuit, the lead angle control unit is a lead angle control circuit as shown in Figure 2 and Figure 3 The lead angle control circuit, and the main control unit is a main control unit as shown in Figure 2and Figure 3 The control unit shown.

[0029] The VSP speed adjustment command receiving unit is configured to receive the VSP speed adjustment command of the motor's rotational speed.

[0030] In some embodiments, the VSP speed adjustment command receiving unit includes: a signal receiving port, a current limiting module, and a signal output port. The current limiting module may be, for example, a first resistor R1.

[0031] The VSP speed adjustment command receiving unit receives the VSP speed adjustment command of the motor speed, and includes: the signal receiving port, which receives the VSP speed adjustment command of the motor speed, limits the current through the current limiting module, and then outputs it through the signal output port to the input terminal of the status switch unit, the first input terminal of the lead angle control unit, and the VSP port of the main control unit, respectively.

[0032] Figure 3 This is a schematic diagram of an embodiment of the phase control device based on a variable slope circuit according to the present invention. Figure 3 As shown, the VSP speed control command receiving circuit includes: a first resistor R1 and the VSP port of the VSP command module in the control unit. Figure 3 In the example shown, the first resistor R1 mainly serves to limit the current. The resistance of the first resistor R1 is much smaller than that of the second resistor R2 and the third resistor R3.

[0033] The status switch unit is configured to determine the speed ramp of the motor based on the VSP speed adjustment command of the motor speed.

[0034] In some embodiments, the state switch unit includes: a first voltage divider module, a second voltage divider module, and a switching transistor module. The first voltage divider module is such as a second resistor R2, the second voltage divider module is such as a third resistor R3, and the switching transistor module is such as a first switching device Q1.

[0035] The VSP speed adjustment command received by the VSP speed adjustment command receiving unit, which controls the motor's rotational speed, is grounded after passing through the first and second voltage divider modules. The common terminal of the first and second voltage divider modules is connected to the control terminal of the switching transistor module (e.g., the base of the first switching device Q1). The first connection terminal of the switching transistor module (e.g., the collector of the first switching device Q1), serving as the output terminal of the state switch unit, is connected to the second input terminal of the lead angle control unit. The second connection terminal of the switching transistor module (e.g., the transmitter of the first switching device Q1) is grounded.

[0036] The state switch unit determines a speed rising slope of the rotating speed of the motor according to a VSP speed regulation instruction of the rotating speed of the motor, and comprises:

[0037] The first voltage division module and the second voltage division module are configured to divide a VSP speed regulation voltage corresponding to the VSP speed regulation instruction of the rotating speed of the motor to obtain a voltage division value of the VSP speed regulation voltage.

[0038] The switch tube module is configured to, based on the voltage division value of the VSP speed regulation voltage, in a case where the voltage division value of the VSP speed regulation voltage is greater than or equal to a conduction threshold value of the switch tube module itself, make the switch tube module itself conductive to determine the speed rising slope of the rotating speed of the motor as a first speed slope; and in a case where the voltage division value of the VSP speed regulation voltage is less than the conduction threshold value of the switch tube module itself, make the switch tube module itself non-conductive to determine the speed rising slope of the rotating speed of the motor as a second speed slope.

[0039] The first speed slope is greater than the second speed slope.

[0040] As shown in Figure 3 The state switch circuit based on the VSP speed regulation instruction comprises a second resistor R2, a third resistor R3, a first capacitor C1 and a first switch device Q1, and preferably the first switch device Q1 is a triode.

[0041] In the example shown in Figure 2 and Figure 3 The VSP speed regulation instruction received by the VSP speed regulation instruction receiving circuit is divided into two paths: one path is input to the control unit and the lead angle control circuit, and the other path controls the state switch circuit based on the VSP. Under the control of different VSP voltage speed regulation instructions, the switch device of the state switch circuit is in a conductive or non-conductive state: when the VSP voltage value is small, the motor is at a low rotating speed, the switch device is non-conductive, the lead angle is small, the phase is small, and the speed rising slope is a small slope value. When the VSP voltage value is large, the motor is at a high rotating speed, the switch device is conductive, the lead angle is large, the phase is large, and the speed rising slope is a large slope value. The slope is proportional to the phase control voltage V PC and the reference voltage V REF , and the reference voltage V REF is preferably 5V.

[0042] Generally, the motor speed is controlled by external speed regulation instruction, namely VSP, for example, when the advance angle is a fixed value A, the VSP input value is m, and the corresponding speed is L, the fixed advance angle has a disadvantage, in the low speed or certain speed range, the power switch device on-off time sequence is good, resulting in the efficiency of bus voltage chopping forming three-phase current is high, but when the motor runs at high speed, since the advance of the power switch device on-off time sequence is a fixed value, the on-off waveform cannot follow the speed change rate, and great electromagnetic noise is generated, which is manifested as the current waveform lags behind.

[0043] The first voltage division module and the second voltage division module are adjusted to adjust the change time of the first speed slope or the second speed slope.

[0044] In Figure 3 In the example shown, the second resistor R2 and the third resistor R3 are used to control the on-off of the first switch device Q1. By changing the resistance ratio of the second resistor R2 and the third resistor R3, the conduction time of the first switch device Q1 in the state switch circuit is controlled, thereby controlling the change time of the speed slope.

[0045] As Figure 3 shown, the base voltage of the first switch device Q1 is VSP / (R1+R2+R3) R3, the conduction of the first switch device Q1 is that the base current is greater than the conduction condition (the conduction condition of the voltage control type and the current control type is different, and the transistor is a current control type), so the change time of the slope can be changed by changing the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3. The first resistor R1 is preferably 1KΩ, and generally the resistance ratio of the second resistor R2 and the third resistor R3 is changed. That is, when VSP is less than the voltage value V2 on the second resistor R2, it is a small speed slope. When VSP is greater than the voltage value V3 on the third resistor R3, it is a large speed slope. V2 is preferably 2.9V, and V3 is preferably 3V.

[0046] In some embodiments, the state switch unit further comprises a filter module, such as a first capacitor C1.

[0047] The filter module is arranged between the control end of the switch tube module and the second connection end of the switch tube module, and is configured to filter the voltage division value of the VSP speed regulation voltage before inputting the voltage division value to the control end of the switch tube module.

[0048] As Figure 3As shown, the state switch circuit based on VSP speed control command includes: a second resistor R2, a third resistor R3 and a first switching device Q1. Preferably, the first switching device Q1 is a transistor.

[0049] The lead angle control unit is configured to determine the lead angle of the motor based on the VSP speed adjustment command of the motor speed and the speed rise slope of the motor speed.

[0050] In some embodiments, the lead angle control unit includes: a third voltage divider module, a fourth voltage divider module, and a boost module. The third voltage divider module may be a fourth resistor R4, the fourth voltage divider module may be a fifth resistor R6, and the boost module may be a sixth resistor R6.

[0051] The common terminal of the third and fourth voltage divider modules serves as the second input terminal of the lead angle control unit. The output terminal of the status switch unit is connected to the PCT port of the main control unit via the third voltage divider module, and grounded via the fourth voltage divider module. The boost module is connected between the PC port of the main control unit and ground.

[0052] The lead angle control unit determines the lead angle of the motor based on the VSP speed adjustment command of the motor speed and the speed rise slope of the motor speed, including:

[0053] The third and fourth voltage divider modules are configured to divide the VSP speed adjustment command of the motor speed and the speed rise slope of the motor speed to obtain the voltage division value of the speed rise slope, which is used as the lead angle bias voltage of the motor speed.

[0054] The boost module is configured to generate a lead angle control voltage for the motor's rotational speed.

[0055] The motor's speed lead angle bias voltage and the motor's speed lead angle control voltage together form the motor's speed lead angle.

[0056] like Figure 3 As shown, the lead angle control circuit includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and the phase bias voltage port PCT and the phase control port PC of the phase control bias current acquisition module in the phase control module of the control unit.

[0057] exist Figure 3In the shown example, the VSP speed regulation instruction received by the VSP speed regulation instruction receiving circuit is input through the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the VSP port of the control unit in one way and connected to the first end of the second resistor R2 of the state switch circuit in another way. In the state switch circuit, the second end of the second resistor R2 is connected to the base of the first switch device Q1, the first end of the third resistor R3, and the first end of the first capacitor C1 at the same time, while the emitter of the first switch device Q1, the second end of the third resistor R3, and the second end of the first capacitor C1 are connected to the ground at the same time. The collector of the first switch device Q1 is connected to the second end of the fourth resistor R4 of the lead angle control circuit and the first end of the fifth resistor R5 at the same time. In the lead angle control circuit, the first end of the fourth resistor R4 is connected to the PCT port which is the phase bias voltage port, the first end of the sixth resistor R6 is connected to the PC port which is the phase control port, and the second end of the fifth resistor R5 and the second end of the sixth resistor R6 are connected to the ground at the same time.

[0058] In Figure 3 In the shown example, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 control the phase size under different VSP voltages. According to the sum of the two resistance values of the fourth resistor R4 and the fifth resistor R5, the speed slope value of the small speed slope state when the first switch device Q1 is off can be calculated. According to the resistance value of the fourth resistor R4, the speed slope value of the large speed slope state when the first switch device Q1 is on can be calculated.

[0059] In the case where the VSP speed regulation voltage corresponding to the VSP speed regulation instruction of the speed of the motor reaches the target voltage value, the maximum value of the lead angle of the motor can be adjusted by adjusting the voltage division ratio of the third voltage division module and the voltage boosting module.

[0060] Referring to Figure 3 In the shown example, when the VSP voltage speed regulation instruction reaches the target voltage value V4, the resistance ratio of the fourth resistor R4 and the sixth resistor R6 can make the actual lead angle reach the maximum lead angle of the control unit. Preferably, the range of the VSP target voltage value V4 is 2V-5.4V.

[0061] The control unit is configured to determine the lead angle phase of the speed of the motor according to the VSP speed regulation instruction of the speed of the motor and the lead angle of the speed of the motor, and control the speed of the motor according to the lead angle phase of the speed of the motor.

[0062] The application range of the phase control scheme of the variable slope circuit provided by the scheme of the application is that the lead angle adjustment of the phase control module of the control unit is based on the phase control bias current of the acquisition module. Figure 2Fig. 1 is a structural schematic diagram of an embodiment of the variable slope circuit according to the present application. As shown in the example, Figure 2 The variable slope circuit in the present application includes a VSP speed regulation instruction receiving circuit, a VSP-based state switch circuit, and a lead angle control circuit. The variable slope circuit is connected to a control unit of the motor. The control unit of the motor includes a VSP instruction module and a phase control module. The VSP speed regulation instruction receiving circuit is connected to the VSP-based state switch circuit, the lead angle control circuit, and the VSP instruction module, respectively. The VSP-based state switch circuit, the lead angle control circuit, and the phase control module are connected in sequence. The VSP instruction module is connected to the phase control module.

[0063] The present application provides a phase control scheme based on a variable slope circuit in a brushless DC motor. The VSP voltage speed regulation instruction is used to control the state switch circuit, so as to change the lead angle of the phase control module in the control unit, and make the motor run at different speed slopes under different VSP voltage speed regulation instructions. In the present application, the variable slope circuit is set based on the VSP voltage speed regulation instruction of the motor, so that the initial lead angle of the phase control circuit of the motor is zero phase lead or small phase lead, and does not exceed the lead angle compensation value set by the control unit. The motor runs smoothly during startup and low-speed operation, and solves the problem of excessive speed fluctuation during startup and low-speed operation of the motor, and also solves the problem of large electromagnetic noise during low-speed operation of the motor.

[0064] In some embodiments, the master control unit includes a VSP instruction module and a phase control module.

[0065] The master control unit determines the lead angle of the motor according to the VSP speed regulation instruction of the motor and the lead angle of the motor, and includes the following steps:

[0066] The VSP instruction module has a VSP port. After receiving the VSP speed regulation instruction of the motor from the VSP port, the VSP instruction module transmits the VSP speed regulation instruction to the phase control module.

[0067] The phase control module has a PCT port and a PC port. In the case where the lead angle of the motor speed is formed by the lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed, the phase control module receives the lead angle bias voltage of the motor speed from the PCT port and receives the lead angle control voltage of the motor speed from the PC port, and then calculates the lead angle phase control voltage of the motor speed based on the VSP speed adjustment voltage corresponding to the VSP speed adjustment instruction of the motor speed, the lead angle bias voltage of the motor speed, and the lead angle control voltage of the motor speed. And the lead angle phase control voltage of the motor speed is converted into digital, and the result of the analog-to-digital conversion is used as the lead angle phase of the motor speed.

[0068] As shown in Figure 3 , the phase control module includes a phase control bias current acquisition module and an ADC module, and the phase control bias current acquisition module outputs a signal L.A. through the ADC module. The signal L.A. is a chip internal identification reference value, which is compared with an internal design reference value to determine whether the chip enters a preset control interval.

[0069] As shown in Figure 3 , based on the lead angle control circuit phase control bias current acquisition module, there is a phase bias voltage V PCT =VSP-V1, a phase bias current I PCT = V PCT / R PCT , and a phase control voltage V PC = I PCT R PC , wherein VSP>V1, V1 is preferably 2.1V. R PC is the resistance value of the resistance from the PC port of the phase control bias current acquisition module to the GND ground terminal, and R PCT is the resistance value of the resistance from the PCT port of the phase control bias current acquisition module to the GND ground terminal.

[0070] Figure 4 is a curve diagram of the VSP voltage speed instruction-lead angle relationship of the present application. As shown in Figure 3 , the circuit is an embodiment. When the VSP speed instruction is input, the first switching device Q1 of the state switching circuit will be turned on or turned off based on the VSP voltage value of the VSP speed instruction: when the VSP voltage value is high (such as VSP≥3.05V), the voltage division of the third resistance R3 is large, the first switching device Q1 is turned on, R PCT is R PCT =R4, and I PCT =V PCTR4, V PC = V PCT R4 R6.When the VSP voltage value is low (such as VSP≤2.5V), the voltage division of the third resistor R3 is small, the first switch device Q1 does not meet the opening condition, R' PCT R' PCT = R4+R5, I' PCT = V PCT / (R4+R5), V' PC = V' PCT / (R4+R5) R6, then V PC >V' PC As shown in Fig. Figure 4 , that is, when the low VSP voltage, V PC / VREF is a small slope value. When the high VSP voltage, V PC / VREF is a large slope value. The motor runs at different speed slopes under different VSP voltage speed regulation commands.

[0071] The technical scheme of the present application sets a variable slope circuit based on the VSP voltage speed regulation command of the motor, the variable slope circuit includes a state switch circuit and a lead angle control circuit, the state switch circuit is controlled by the VSP voltage speed regulation command, and then the lead angle control circuit is controlled, so as to change the size of the lead angle and the lead phase of the phase control module in the control unit, and the change does not exceed the lead angle compensation value set by the control unit, so that the motor runs at different speed slopes under different VSP voltage speed regulation commands, and the motor runs smoothly during starting and low-speed operation, solving the problem of excessive speed fluctuation of the motor during starting and low-speed operation.

[0072] According to the embodiments of the present application, a motor corresponding to the phase control device of the motor is also provided. The motor can include the above-mentioned phase control device of the motor.

[0073] Since the processing and functions realized by the motor of the present embodiment are basically corresponding to the embodiments, principles and examples of the device, the description of the present embodiment will not be described in detail, and the related description in the foregoing embodiments can be referred to, which will not be described herein.

[0074] The technical scheme of the present application sets a variable slope circuit based on the VSP voltage speed regulation instruction of the motor, the variable slope circuit comprises a state switch circuit and a lead angle control circuit, the state switch circuit is controlled by the VSP voltage speed regulation instruction, and then the lead angle control circuit is controlled, so as to change the lead angle and lead phase of the phase control module in the control unit, and the lead angle compensation value set by the control unit is not exceeded, so that the motor runs at different speed slopes under different VSP voltage speed regulation instructions, the temperature rise of the motor and the controller under high speed operation is reduced, and the problem of high temperature rise of the motor due to the single speed rise in different VSP voltage stages is solved.

[0075] According to the embodiments of the present application, a phase control method of a motor corresponding to the motor is also provided, as shown in the flowchart of an embodiment of the method of the present application. Figure 5 The phase control method of the motor can comprise steps S110 to S140.

[0076] At step S110, a VSP speed regulation instruction receiving unit for controlling the speed of the motor receives a VSP speed regulation instruction of the motor.

[0077] At step S120, a state switch control unit is controlled according to the VSP speed regulation instruction of the motor, and the speed rise slope of the motor is determined.

[0078] At step S130, a lead angle control unit is controlled according to the VSP speed regulation instruction of the motor and the speed rise slope of the motor, and the lead angle of the motor is determined.

[0079] At step S140, a main control unit is controlled according to the VSP speed regulation instruction of the motor and the lead angle of the motor, and the lead angle and lead phase of the motor are determined, so as to control the speed of the motor according to the lead angle and lead phase of the motor.

[0080] In the application, the judging unit is a VSP-based state switching circuit, the setting parameter of the judging unit is the switching condition of the first switching device Q1, and the operating parameter of the judging unit is the VSP voltage speed regulation instruction; if the first switching device Q1 is turned on, it is the first state condition, the phase bias current and the phase control voltage of the lead angle control circuit are used to control the lead angle, the lead angle is in the large phase state, and then the motor is controlled in phase, and the speed rising slope is a large slope value. If the first switching device Q1 is turned off, it is the second state condition, the phase bias current and the phase control voltage of the lead angle control circuit are used to control the lead angle, the lead angle is in the small phase state, and then the motor is controlled in phase, and the speed rising slope is a small slope value. The judging unit is constructed by the overall circuit designed by the scheme of the application. When the VSP is lower than the threshold value, the lead angle changes with the VSP voltage in a small slope, and when the VSP voltage is higher than the threshold value, the circuit is operated to turn on the transistor through voltage division to make the circuit enter the large slope state.

[0081] In the large slope working condition, V PC = V PCT / R4 R6; in the small slope working condition, V PC = V PCT / (R4+R5) R6. In the same working condition of the same circuit, V PCT and R6 are constant, and then the slope value of the large slope state when the switching device is turned on can be calculated according to the resistance value of the fourth resistor R4; and the speed slope value of the small slope state when the switching device is turned off can be calculated according to the sum of the resistance values of the fourth resistor R4 and the fifth resistor R5.

[0082] As Figure 4 shown, when the VSP voltage speed regulation instruction reaches the target voltage value V4, the actual lead angle should reach the maximum lead angle of the control unit. When the VSP voltage speed regulation instruction reaches the target voltage value V4, the VSP voltage value continues to increase, and the lead angle of the control unit should not increase. Adjusting the resistance ratio of the fourth resistor R4 and the sixth resistor R6 can make the actual lead angle reach the maximum lead angle of the control unit. The VSP target voltage value V4 is preferably 5.4V; and the maximum lead angle of the control unit should be the lead angle limit value of the phase control module of the internal hardware circuit of the control unit, or the maximum lead angle limit value written by the software program.

[0083] According to the scheme of the application, the variable slope circuit is arranged, so that the phase control voltage V PC of the motor is changed with the reference voltage V REFThe small slope value characteristic operation reduces electromagnetic and resonance noise in the process of starting and low-speed operation, and solves the problem of resonance noise of the motor in the process of starting and low-speed operation. In the scheme of the application, the voltage V PC / reference voltage V REF The large slope value characteristic operation reduces the temperature rise of the motor and the controller in high-speed operation, and solves the problem of excessive temperature rise of the motor due to single speed rise in different VSP voltage stages.

[0084] Since the processing and functions realized by the method of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the motor, the description of the embodiment will not be described in detail, and the related description in the foregoing embodiments can be referred to, which will not be described herein.

[0085] By adopting the technical scheme of the embodiment, a variable slope circuit is set based on the VSP voltage speed regulation instruction of the motor, the variable slope circuit includes a state switch circuit and a lead angle control circuit, the state switch circuit is controlled by the VSP voltage speed regulation instruction, and then the lead angle control circuit is controlled, so as to change the size of the lead angle and the lead phase of the phase control module in the control unit, and the change does not exceed the lead angle compensation value set by the control unit. The motor runs at different speed slopes under different VSP voltage speed regulation instruction states, so that the phase current of the motor is small in the low-speed section and large in the high-speed section in the lead angle control method following the VSP change. At least, the electromagnetic noise of the motor in the process of low-speed operation is reduced, and the use experience of the user is improved.

[0086] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0087] The above only describes the embodiments of the application and is not used to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of the claims of the application.

Claims

1. A phase control device for an electric machine, characterized by The VSP speed regulation instruction receiving unit, the state switch unit, the lead angle control unit and the master control unit are included. The state switch unit includes a first voltage dividing module, a second voltage dividing module and a switch tube module; wherein the VSP speed regulation instruction of the motor speed received by the VSP speed regulation instruction receiving unit is grounded after passing through the first voltage dividing module and the second voltage dividing module; the common end of the first voltage dividing module and the second voltage dividing module is connected to the control end of the switch tube module; the first connection end of the switch tube module, as the output end of the state switch unit, is connected to the second input end of the lead angle control unit; the second connection end of the switch tube module is grounded; wherein The VSP speed regulation instruction receiving unit is configured to receive the VSP speed regulation instruction of the motor speed. The state switch unit is configured to determine the speed rising slope of the motor speed according to the VSP speed regulation instruction of the motor speed, including that the first voltage dividing module and the second voltage dividing module are configured to divide the VSP speed regulation voltage corresponding to the VSP speed regulation instruction of the motor speed to obtain the voltage dividing value of the VSP speed regulation voltage; the switch tube module is configured to determine the speed rising slope of the motor speed as the first speed slope in the case that the voltage dividing value of the VSP speed regulation voltage is greater than or equal to the conduction threshold of the switch tube module itself, and make the switch tube module itself conductive; and determine the speed rising slope of the motor speed as the second speed slope in the case that the voltage dividing value of the VSP speed regulation voltage is less than the conduction threshold of the switch tube module itself, and make the switch tube module itself non-conductive; wherein the first speed slope is greater than the second speed slope. The lead angle control unit is configured to determine the lead angle of the motor speed according to the VSP speed regulation instruction of the motor speed and the speed rising slope of the motor speed. The master control unit is configured to determine the lead phase of the motor speed according to the VSP speed regulation instruction of the motor speed and the lead angle of the motor speed, and control the motor speed according to the lead phase of the motor speed. The VSP speed regulation instruction receiving unit includes a signal receiving port, a current limiting module and a signal output port; wherein 2. The phase control apparatus of the electric motor according to claim 1, characterized by The VSP speed regulation instruction receiving unit receives the VSP speed regulation instruction of the motor speed, including that After the signal receiving port receives the VSP speed regulation instruction of the motor speed, the current limiting module limits the current, and then the signal output port outputs to the input end of the state switch unit, the first input end of the lead angle control unit and the VSP port of the master control unit, respectively. Wherein, 3. The phase control apparatus of the electric motor according to claim 1, characterized by ​ By adjusting the voltage division ratio of the first voltage division module and the second voltage division module, the time of changing the first speed slope or the second speed slope can be adjusted.

4. The phase control apparatus of the electric motor according to claim 1 or 3, characterized by The state switch unit further comprises a filtering module. The filtering module is arranged between the control end of the switch tube module and the second connection end of the switch tube module, and is configured to filter the voltage division value of the VSP speed adjustment voltage before inputting the voltage division value to the control end of the switch tube module.

5. The phase control apparatus of the electric motor according to claim 1, characterized by The lead angle control unit comprises a third voltage division module, a fourth voltage division module and a voltage boosting module. The output end of the state switch unit is connected to the PCT port of the main control unit through the third voltage division module, and is grounded through the fourth voltage division module. The lead angle control unit determines the lead angle of the motor speed according to the VSP speed adjustment instruction of the motor speed and the speed rising slope of the motor speed, and comprises: The third voltage division module and the fourth voltage division module are configured to divide the VSP speed adjustment instruction of the motor speed and the speed rising slope of the motor speed to obtain a voltage division value of the speed rising slope as the lead angle bias voltage of the motor speed. The voltage boosting module is configured to generate the lead angle control voltage of the motor speed. The lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed form the lead angle of the motor speed.

6. A phase control device for an electric machine according to claim 5, characterized in that In the case that the VSP speed adjustment voltage corresponding to the VSP speed adjustment instruction of the motor speed reaches the target voltage value, by adjusting the voltage division ratio of the third voltage division module and the voltage boosting module, the maximum value of the lead angle of the motor speed can be adjusted. The main control unit comprises a VSP instruction module and a phase control module.

7. The phase control apparatus of an electric motor according to any one of claims 1 to 3, 5, 6, characterized in that, The main control unit determines the lead angle phase of the motor speed according to the VSP speed adjustment instruction of the motor speed and the lead angle of the motor speed, and comprises: The VSP instruction module has a VSP port. After receiving the VSP speed adjustment instruction of the motor speed from the VSP port, the VSP instruction module transmits the VSP speed adjustment instruction to the phase control module. ​ The phase control module has a PCT port and a PC port; in the case where the lead angle of the motor speed is formed by the lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed, the phase control module receives the lead angle bias voltage of the motor speed from the PCT port and receives the lead angle control voltage of the motor speed from the PC port, and then calculates the lead angle phase control voltage of the motor speed based on the VSP speed adjustment voltage corresponding to the VSP speed adjustment instruction of the motor speed, the lead angle bias voltage of the motor speed, and the lead angle control voltage of the motor speed; and the lead angle phase control voltage of the motor speed is analog-to-digital converted, and the result of the analog-to-digital conversion is taken as the lead angle lead phase of the motor speed.

8. The phase control apparatus of the electric motor according to claim 4, characterized by The main control unit comprises a VSP instruction module and a phase control module; wherein The main control unit determines the lead angle lead phase of the motor speed according to the VSP speed adjustment instruction of the motor speed and the lead angle of the motor speed, comprising: The VSP instruction module has a VSP port; after the VSP instruction module receives the VSP speed adjustment instruction of the motor speed from the VSP port, it is transmitted to the phase control module; The phase control module has a PCT port and a PC port; in the case where the lead angle of the motor speed is formed by the lead angle bias voltage of the motor speed and the lead angle control voltage of the motor speed, the phase control module receives the lead angle bias voltage of the motor speed from the PCT port and receives the lead angle control voltage of the motor speed from the PC port, and then calculates the lead angle phase control voltage of the motor speed based on the VSP speed adjustment voltage corresponding to the VSP speed adjustment instruction of the motor speed, the lead angle bias voltage of the motor speed, and the lead angle control voltage of the motor speed; and the lead angle phase control voltage of the motor speed is analog-to-digital converted, and the result of the analog-to-digital conversion is taken as the lead angle lead phase of the motor speed.

9. An electric machine characterized by Comprise: The phase control device of the motor according to any one of claims 1 to 8.

10. A method of phase control of an electric machine corresponding to the phase control device of any one of claims 1 to 8, characterized by, Comprise: A VSP speed adjustment instruction receiving unit for receiving a VSP speed adjustment instruction of a motor speed; A control state switching unit for determining a speed rise slope of the motor speed according to the VSP speed adjustment instruction of the motor speed; A lead angle control unit for determining a lead angle of the motor speed according to the VSP speed adjustment instruction of the motor speed and the speed rise slope of the motor speed; The control master unit determines a lead angle lead phase of the rotational speed of the motor according to a VSP speed regulation instruction of the rotational speed of the motor and a lead angle of the rotational speed of the motor, so as to control the rotational speed of the motor according to the lead angle lead phase of the rotational speed of the motor.

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