Motor signal feedback control method

Abstract

The invention discloses a motor signal feedback control method, which comprises a step of physically connecting an optical coupler U1 between a motor and a main control board, and comprises the following steps of: setting N function relational expressions established by different motor state feedback signals and PWM frequency f in the main control board, and defining a PWM frequency range for each function relational expression, meanwhile, a sending period of the motor is set; the motor circularly outputs PWM frequency signals corresponding to the motor state feedback signals to the main control board according to the sending period time sequence; and the main control board judges the type of the motor state feedback signal according to the frequency range of the received PWM frequency signal, calculates the actual value of each motor state feedback signal according to the corresponding function relation, and adjusts the target quantity of the motor according to the actual value of each motor state feedback signal. The function that the motor can send a plurality of motor state signal feedbacks to the main control board only through one optical coupler signal is achieved, and the main control board accurately adjusts the target value of the motor according to the plurality of motor state feedback signals.

Description

[Technical field]

[0001] The invention relates to a motor signal feedback control method. [Background Technology]

[0002] In recent years, with the increasingly fierce competition in the field of electrical appliances, the requirements for product technology have been continuously improved. For example, HVAC heating and cooling air conditioning products require precise control, making the motor a key component to solve this technical problem. At the same time, in HVAC heating and cooling air conditioning, in addition to real-time control of the motor target speed, torque, and air volume, the HVAC system mainboard also needs to feedback various motor status signals to the mainboard, so that the mainboard can determine the motor type and whether its operating status meets expectations based on the feedback motor status signal, and then adjust the motor target quantity in real time through the HVAC system mainboard based on the judgment result, so as to achieve a closed-loop control state with the motor status feedback signal, thereby accurately controlling the motor.

[0003] However, in traditional HVAC heating and cooling air conditioners, traditional PSC motors or PWM motors are used in conjunction with the HVAC system motherboard. The two are controlled through open-loop control, or only through a feedback speed signal. This leads to the problem that the motor state cannot be accurately controlled through the HVAC system motherboard. [Summary of the invention]

[0004] The present invention overcomes the shortcomings of the prior art and provides a motor signal feedback control method, which enables the motor to realize multiple motor state signal feedback through an optical coupler signal, thereby achieving precise control of the motor by the main control board.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A motor signal feedback control method includes an optocoupler U1, wherein pin 4 of the optocoupler U1 is connected to the motor as a transmitting end anode through a resistor R1 to receive a motor feedback signal, pin 3 of the optocoupler U1 is grounded as a transmitting end cathode, pin 1 of the optocoupler U1 is connected to a power supply as a receiving end collector through a resistor R2, and pin 2 of the optocoupler U1 is connected to a main control board as a receiving end emitter to output a PWM frequency signal, wherein: the method includes:

[0007] S1. Set a functional relationship between N different motor state feedback signals and PWM frequency f in the main control board, and define a PWM frequency range for each functional relationship, and the PWM frequency ranges do not overlap; at the same time, set a transmission cycle of the motor, and divide the transmission cycle into M transmission cycle time periods, and set the motor to feedback PWM frequency signals corresponding to different motor state feedback signals in different transmission cycle time periods;

[0008] S2, the motor outputs the PWM frequency signal corresponding to each motor status feedback signal to the main control board according to the sending cycle timing cycle;

[0009] S3. The main control board determines the type of motor state feedback signal according to the frequency range of the received PWM frequency signal, and calculates the actual value of each motor state feedback signal according to the corresponding functional relationship. The main control board adjusts the motor target value according to the actual value of each motor state feedback signal.

[0010] The motor signal feedback control method as described above is characterized in that: N in S1 is an integer, and N>1.

[0011] The motor signal feedback control method as described above is characterized in that: M in S1 is an integer, and M≥N.

[0012] The motor signal feedback control method as described above is characterized in that the duration of each sending cycle time period in S1 is the same.

[0013] The motor signal feedback control method as described above is characterized in that the motor is a PSC motor or a PWM motor.

[0014] A motor signal feedback control method as described above is characterized in that: a motor driving module for driving the motor to rotate is provided in the motor, and a motor control module connected to the motor driving module to control the motor rotation and can initialize motor-related variables and extract motor operating parameters, the motor control module is connected to a plurality of motor state signal feedback frequency function modules for converting corresponding motor-related operating parameters into corresponding motor state signal frequencies, and a sending signal time counter for calculating the sending signal time; the motor state signal feedback frequency function module is connected to the optocoupler U1 as a PWM sending module; a mainboard receiving signal module is provided on the main control board for receiving a PWM frequency signal and identifying a corresponding motor state feedback signal according to a frequency range, the mainboard receiving signal module is connected to a plurality of motor state feedback signal decoding modules for calculating the actual value of the corresponding motor state feedback signal by using a functional relationship corresponding to the motor state feedback signal type according to the PWM frequency signal, and the main control board control module adjusts the motor target amount according to the actual value of each motor state feedback signal.

[0015] The motor signal feedback control method as described above is characterized in that the motor state feedback signal includes a power feedback signal, a speed feedback signal, a state feedback signal, a bus voltage feedback signal, a current feedback signal and a torque feedback signal.

[0016] The motor signal feedback control method as described above is characterized in that the motor target quantity is a speed target quantity, a torque target quantity or an air volume target quantity.

[0017] The motor signal feedback control method as described above is characterized in that: the motor state signal feedback frequency function module includes a speed feedback frequency function module, a power feedback frequency function module and a state feedback frequency function module; the motor state feedback signal decoding module includes a speed feedback signal decoding module, a power feedback signal decoding module and a state feedback signal decoding module.

[0018] The motor signal feedback control method as described above is characterized in that the PWM frequency signal is a PWM frequency square wave signal.

[0019] The beneficial effects of the present invention are:

[0020] An optocoupler U1 is physically connected between the motor and the main control board of the present invention, and through software logic control, the function of the motor sending multiple motor status signal feedback to the main control board through only one optocoupler signal is realized, so that the main control board can accurately adjust the target value of the motor in real time according to the multiple motor status feedback signals, and at the same time simplify the hardware structure of the main control board and the motor, reducing costs. [Drawings]

[0021] Figure 1 is a circuit diagram of an optocoupler of the present invention;

[0022] Figure 2 This is a logic diagram for realizing the software of the present invention. [Specific implementation method]

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0025] like Figure 1 As shown, a motor signal feedback control method includes an optocoupler U1, wherein pin 4 of the optocoupler U1 is connected to the motor through a resistor R1 as a transmitting end anode to receive the motor feedback signal, pin 3 of the optocoupler U1 is grounded as a transmitting end cathode, pin 1 of the optocoupler U1 is connected to the power supply through a resistor R2 as a receiving end collector, and pin 2 of the optocoupler U1 is connected to the main control board as a receiving end emitter to output a PWM frequency signal. The method includes:

[0026] S1. Set functional relationships between N different motor state feedback signals and PWM frequency f in the main control board, and define a PWM frequency range for each functional relationship, and the PWM frequency ranges do not overlap; at the same time, set a transmission cycle of the motor, and divide the transmission cycle into M transmission cycle time periods, and set the motor to feedback PWM frequency signals corresponding to different motor state feedback signals in different transmission cycle time periods; wherein N and M are integers, and N>1, M≥N; the motor is a PSC motor or a PWM motor.

[0027] Preferably, M=N, and the duration of each sending cycle time period in a sending cycle is the same; the motor state feedback signal includes a power feedback signal, a speed feedback signal, a state feedback signal, a bus voltage feedback signal, a current feedback signal and a torque feedback signal.

[0028] S2, the motor outputs the PWM frequency signal corresponding to each motor status feedback signal to the main control board according to the sending cycle timing cycle;

[0029] S3. The main control board determines the type of motor state feedback signal according to the frequency range of the received PWM frequency signal, and calculates the actual value of each motor state feedback signal according to the corresponding functional relationship. The main control board adjusts the motor target value according to the actual value of each motor state feedback signal.

[0030] Preferably, the motor target quantity is a rotation speed target quantity, a torque target quantity or an air volume target quantity.

[0031] The following is an application example in which the motor outputs power feedback signal, speed feedback signal and status feedback signal to the main control board through an optocoupler signal. The control method is as follows:

[0032] S1. Establish a functional relationship between the motor feedback signal and the PWM frequency f, so that the PWM signal frequency changes with the change of the motor signal value, and define the frequency range of the functional relationship. The definitions are as follows:

[0033] Define the speed feedback PWM signal frequency f1 = f(RPM), and the range of f1 is (0, 300 Hz);

[0034] Define the power feedback PWM signal frequency f2 = f(HP), and the range of f2 is (300, 350 Hz);

[0035] Define the state feedback PWM signal frequency f3 = f(FO), and the range of f3 is (350, 400 Hz).

[0036] S2. After the above PWM signals of different frequencies are generated, the above PWM signals are output to the main control board in a transmission cycle T as a timing cycle according to the agreement; if three frequency signals of power feedback signal, speed feedback signal and state feedback signal are set in this application, a transmission cycle T can be set to 30S, and the above three PWM signals can be set to be sent in a cyclic manner according to the following timing, respectively

[0037] In 0-10S, the output power feedback PWM signal;

[0038] In 11-20S, the speed feedback PWM signal is output;

[0039] In 21-30S, the output state feedback PWM signal.

[0040] S3. After receiving the above three PWM signals, the main control board determines the corresponding motor state feedback signal type according to the agreed frequency range characteristics, and reversely calculates the actual value of the corresponding motor state feedback signal according to the corresponding functional relationship. The main control board then accurately adjusts the motor target value based on these feedback actual values.

[0041] In this case, more signal frequency ranges and corresponding functional relationships can be further defined in S1 according to the actual motor feedback signal type requirements. At the same time, the number of time periods of the sending cycle can be set in S2 according to the number of motor feedback signal types in S1.

[0042] like Figure 2 As shown, the motor is provided with a motor driving module for driving the motor to rotate, and a motor control module connected to the motor driving module to control the motor rotation and capable of initializing motor-related variables and extracting motor operating parameters, the motor control module is connected with a plurality of motor state signal feedback frequency function modules for converting corresponding motor-related operating parameters into corresponding motor state signal frequencies, and a sending signal time counter for calculating the sending signal time; the motor state signal feedback frequency function module is connected with the optocoupler U1 as a PWM sending module; a mainboard receiving signal module is provided on the main control board for receiving a PWM frequency signal and identifying a corresponding motor state feedback signal according to a frequency range, the mainboard receiving signal module is connected with a plurality of motor state feedback signal decoding modules for calculating the actual value of the corresponding motor state feedback signal by a functional relationship of the corresponding motor state feedback signal type using the PWM frequency signal, and the main control board control module adjusts the motor target amount according to the actual value of each motor state feedback signal.

[0043] Preferably, the motor state signal feedback frequency function module includes a speed feedback frequency function module, a power feedback frequency function module and a state feedback frequency function module; the motor state feedback signal decoding module includes a speed feedback signal decoding module, a power feedback signal decoding module and a state feedback signal decoding module, and the PWM frequency signal is a PWM frequency square wave signal.

[0044] In the software implementation logic, after the motor starts to rotate, the motor control module initializes the motor-related variables and extracts the corresponding motor motion parameters, and then sends the corresponding motor motion parameters to the speed feedback frequency function module, the power feedback frequency function module, and the state feedback frequency function module respectively; then, according to the calculation time of the sending signal time counter, the speed feedback frequency function module, the power feedback frequency function module, and the state feedback frequency function module send the corresponding frequency signal to the optocoupler U1 as the PWM sending module in turn within one sending cycle, wherein the frequency signal range of the speed feedback frequency function module is (0, 300hz), the frequency signal range of the power feedback frequency function module is (300, 350hz), and the state feedback frequency The frequency signal range of the function module is (350, 400hz); then the optocoupler U1 converts each frequency signal into a corresponding PWM square wave frequency signal and sends it to the main control board; then the main board receiving signal module identifies the motor state feedback signal type corresponding to the PWM square wave frequency signal according to the agreed frequency signal range, and sends the corresponding PWM square wave frequency signal to the speed feedback signal decoding module, the power feedback signal decoding module or the state feedback signal decoding module according to the motor state feedback signal type; then each motor state feedback signal decoding module performs an inverse function calculation based on the corresponding function relationship to obtain the actual value of each motor state feedback signal; finally, the main control board control module adjusts the motor target according to the actual value of each motor state feedback signal. Among them, the inverse function calculation is a function relationship established based on the motor state feedback signal and the PWM frequency f, and the actual value of the motor state feedback signal is calculated in reverse.

[0045] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor signal feedback control method, comprising an optocoupler U1, wherein pin 4 of the optocoupler U1 is connected to the motor as a transmitting end anode through a resistor R1 to receive a motor feedback signal, pin 3 of the optocoupler U1 is grounded as a transmitting end cathode, pin 1 of the optocoupler U1 is connected to a power supply as a receiving end collector through a resistor R2, and pin 2 of the optocoupler U1 is connected to a main control board as a receiving end emitter to output a PWM frequency signal, characterized in that: The method includes S1. Set a functional relationship between N different motor state feedback signals and PWM frequency f in the main control board, and define a PWM frequency range for each functional relationship, and the PWM frequency ranges do not overlap; at the same time, set a transmission cycle of the motor, and divide the transmission cycle into M transmission cycle time periods, and set the motor to feedback PWM frequency signals corresponding to different motor state feedback signals in different transmission cycle time periods; S2, the motor outputs the PWM frequency signal corresponding to each motor status feedback signal to the main control board according to the sending cycle timing cycle; S3. The main control board determines the type of motor state feedback signal according to the frequency range of the received PWM frequency signal, and calculates the actual value of each motor state feedback signal according to the corresponding functional relationship. The main control board adjusts the motor target value according to the actual value of each motor state feedback signal.

2. A motor signal feedback control method according to claim 1, characterized in that: In S1, N is an integer and N>1.

3. A motor signal feedback control method according to claim 1 or 2, characterized in that: In S1, M is an integer and M≥N.

4. A motor signal feedback control method according to claim 3, characterized in that: The duration of each sending cycle time period in S1 is the same.

5. The motor signal feedback control method according to claim 1, characterized in that: The motor is a PSC motor or a PWM motor.

6. A motor signal feedback control method according to claim 1, characterized in that: The motor is provided with a motor drive module for driving the motor to rotate, and a motor control module connected to the motor drive module to control the motor rotation and can initialize motor-related variables and extract motor operating parameters. The motor control module is connected with multiple motor state signal feedback frequency function modules for converting corresponding motor-related operating parameters into corresponding motor state signal frequencies, and a sending signal time counter for calculating the sending signal time; the motor state signal feedback frequency function module is connected to the optocoupler U1 as a PWM sending module; the main control board is provided with a mainboard receiving signal module for receiving PWM frequency signals and identifying corresponding motor state feedback signals according to the frequency range, the mainboard receiving signal module is connected with multiple motor state feedback signal decoding modules for calculating the actual value of the corresponding motor state feedback signal through the functional relationship of the corresponding motor state feedback signal type using the PWM frequency signal, and the main control board control module adjusts the motor target amount according to the actual value of each motor state feedback signal.

7. A motor signal feedback control method according to claim 1 or 6, characterized in that: The motor state feedback signal includes a power feedback signal, a speed feedback signal, a state feedback signal, a bus voltage feedback signal, a current feedback signal and a torque feedback signal.

8. A motor signal feedback control method according to claim 1 or 6, characterized in that: The motor target quantity is a speed target quantity, a torque target quantity or an air volume target quantity.

9. The motor signal feedback control method according to claim 6, characterized in that: The motor state signal feedback frequency function module includes a speed feedback frequency function module, a power feedback frequency function module and a state feedback frequency function module; the motor state feedback signal decoding module includes a speed feedback signal decoding module, a power feedback signal decoding module and a state feedback signal decoding module.

10. A motor signal feedback control method according to claim 1 or 6, characterized in that: The PWM frequency signal is a PWM frequency square wave signal.

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