A motor drive method, device and system for PWM, s-pam, and phase linkage control

Abstract

The invention discloses a drive control method, device and system for PWM, S-PAM, and PHASE linkage control permanent magnet synchronous motors, wherein the method includes: S1. PWM voltage control is the main control system; S2. Judging the PWM voltage Whether the control has reached the limit; S3. PWM and PHASE voltage control linkage; S4. Judging whether the S-PAM control opening condition set by the PHASE linkage control is reached; S5. S-PAM and PHASE linkage control; S6. Judging S-PAM Control whether to increase the DC voltage Ed to reach the limit value Ed-limit; S7. Enter the PHASE main control system; S8. Determine whether the PHASE control has reached the voltage saturation limit; S9. Voltage control PWM, S-PAM, and PHASE have reached the limit at the same time, frequency hold. When the voltage control reaches the limit, the present invention can prevent the speed from decreasing, and when the voltage control returns below the limit, the speed can be restored immediately, improving the overall efficiency of the frequency conversion system, and allowing the compressor to output the maximum capacity under the condition of limited input power.

Description

technical field [0001] The present invention relates to the field of motor drive control, and more specifically, relates to a motor drive method, device and system for PWM, S-PAM, and PHASE linkage control. Background technique [0002] The biggest advantage of the DC inverter air conditioner is that it can run to a high frequency range to achieve rapid cooling or heating effects. change. The method of high efficiency of permanent magnet synchronous motor is: [0003] 1. High-performance magnets are used to increase the amount of magnetic flux; [0004] 2. Work hard on the winding method of the coil, increase the slit occupancy rate, use thick copper wire, and increase the number of winding turns; [0005] 3. Reduce inductance, improve motor voltage utilization, etc.; [0006] Here, the first two are to increase the power generation quantity KE, even at the same speed, a large induced voltage will also occur. The cooling operation time of the air conditioner is long, an...

AI Technical Summary

Problems solved by technology

In addition, the cooling operation is in the middle speed range, and it is not restricted by the motor voltage, so the tendency to increase the quantitative power generation is particularly strong. As a result, the control of the high-speed heating operation becomes difficult.

[0007] 1. It is only the combination of PWM control and voltage phase (PHASE) control. When the received voltage is low, the PWM control will reach the limit. The voltage phase control realized by weak magnetic field control is the main body. At this time, the excitation current increases negatively and becomes Into an "extremely weak state", the motor current increases, resulting in increased losses

Moreover, under the condition of a motor with a large power generation constant KE, when the voltage phase control limit is reached, the motor will have to be stopped or the capacity will be sacrificed to reduce the speed

[0008] 2. It is only the combination of PWM control and PAM control. When the received voltage is low, the PWM control will reach the limit. The PAM voltage control of the PFC (Power Factor Correction, power factor correction) main circuit is the main body, and the result is that the boost ratio changes. Large, PFC main loop loss increases, resulting in reduced efficiency

[0009] 3. In addition to the condition of a motor with a large power generation constant KE, the step-up ratio must be increased to maintain a high DC voltage, and the loss of the main circuit of the inverter will also increase, resulting in an increase in the overall temperature of the device

[0010] In some extreme cases, when the voltage phase (PHASE) control limit is reached, the motor will have to be stopped or the ability will be sacrificed to reduce the speed

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