abstract<br>With the development of power electronic technology, micro processing technology and permanent magnet material technology, the speed control and servo system of AC and DC motor is developing towards the direction of integrated motor and digital control. The development direction of integrated motor is mainly reflected in the integrated BLDCM and permanent magnet synchronous motor system, which is becoming the mainstream of AC and DC electric drive system. The pulse width modulation (PWM) technology and the corresponding power switch circuit technology are the basis of digital control. The performance of SCM and DSP is improving, especially the hardware resources integrated in DSP are more and more, which is closer to SCM from the perspective of application. At the same time, power electronic devices and their driving technology are more mature, such as IPM module and other power range is also more and more wide. On this basis, PWM control technology and motor control technology are becoming more and more mature. Among all kinds of periodic control signals, sine wave control signal is the most widely used, which is generally referred to as sine wave pulse width modulation (SPWM). With the appearance and wide application of SPWM technology, on the one hand, the performance of motor control system in traditional electric drive is continuously improved, on the other hand, the application of new high-performance integrated motor system in DC and AC electric drive is more and more extensive.<br>
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