PWM (Pulse-Width Modulation), S-PAM (Spectrum-Pulse Amplitude Modulation) and PHASE linkage control motor driving method, device and system

Abstract

The invention discloses a PWM (Pulse Width Modulation), S-PAM (Spectrum-Pulse Amplitude Modulation) and PHASW linkage control permanent magnetic synchronous motor drive control method, device and system. The method comprises the following steps of: S1, taking PWM voltage control as a master control system; S2, judging whether the PWM voltage control reaches the limit or not; S3, carrying out PWM and PHASE voltage control linkage; S4, judging whether opening condition of S-PAM control set by the PHASW linkage control is met or not; S5, carrying out S-PAM and PHASW linkage control; S6, judging whether S-PAM control improving direct current voltage Ed reaches the limit value Ed-limit; S7, entering PHASE as the master control system; S8, judging whether PHASW control reaches voltage saturation limit or not; and S9, holding frequency when the voltage control PWM, S-PAM and PHASW reach the limit at the same time. In the method disclosed by the invention, speed can be prevented from being reduced when voltage control reaches the limit, the speed can be immediately recovered when the voltage control returns to be below the limit, comprehensive efficiency of a variable frequency system is improved, and a compressor can output maximum capacity under the condition that an input power is limited.

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...

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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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