Speed sensorless control method of permanent magnet synchronous motor with secondarily-constructed switching voltage
A permanent magnet synchronous motor, speed sensorless technology, applied in the field of power electronic converter, can solve the problems of increased ripple, divergent speed estimation algorithm, inaccurate MRAS input signal, etc. Effects without resources
Active Publication Date: 2019-04-26
JIAXING FUER ELECTRONICS TECH CO LTD
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Problems solved by technology
When the switching frequency is high, the MRAS algorithm can also obtain a better speed estimation effect, but at a low switching frequency, due to the increase of the ripple in the modulation algorithm, the real stator voltage and the command value are not always equal Yes, this will lead to inaccurate input signals of MRAS, and even cause the speed estimation algorithm to diverge
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[0023] The invention discloses a speed sensorless control method of a permanent magnet synchronous motor with a secondary structure of switching voltage. The specific implementation of the invention will be further described below in combination with preferred embodiments.
[0024] see attached Figure 1 to Figure 4 , preferably, the permanent magnet synchronous motor speed sensorless control method of the secondary structure of the switching voltage comprises the following steps:
[0025] Step S1: At the end of the previous switching period, calculate the duty cycle of the PWM wave in the next switching period in the main interrupt of the last calculation period of the switching period, and update the value of the ePWM register at the same time;
[0026] Step S2: The Timer timer counts in the next switching cycle, triggers the ePWM underflow interrupt according to the duty cycle, and sends out the actual PWM wave.
[0027] Preferably, each switching period is preset with sev...
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The invention discloses a speed sensorless control method of a permanent magnet synchronous motor with secondarily-constructed switching voltage. The speed sensorless control method comprises the following steps that step S1, at the end of a last switching cycle, the duty ratio of a PWM wave in a next switching cycle is calculated in the main interrupt of the last calculation cycle of the switching cycle, and the value of an ePWM register is updated; and step S2, a Timer timer counts in the next switching cycle, triggers the ePWM underflow interrupt according to the duty ratio, and issues theactual PWM wave. The speed sensorless control method of the permanent magnet synchronous motor with the secondarily-constructed switching voltage can perform the speed sensorless control at the high power and low switching frequency by performing secondary construction on a switching voltage, and has the characteristics such as accurate rotation speed assessment, easy implementation and no need for additional resources.
Description
technical field [0001] The invention belongs to the technical field of electric power electronic conversion, and in particular relates to a speed sensorless control method of a permanent magnet synchronous motor with a switching voltage secondary structure. Background technique [0002] In a general power electronic control system, since the calculation frequency of system sampling is consistent with the switching frequency, the stator voltage of the speed sensorless algorithm in each calculation cycle can be determined according to the switching state of the three-phase bridge arm of the inverter in the software. Obtain. [0003] However, in the application of high power and low switching frequency, because the sampling frequency of the system is higher than the carrier frequency, the traditional voltage construction method will lead to large errors and make the algorithm unstable. [0004] Specifically, in a high-power control system, the main frequency of the control chi...
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Login to View More IPC IPC(8): H02P6/18
CPCH02P6/18H02P2207/05
Inventor 朱强梁光耀宋加旺刘广财
Owner JIAXING FUER ELECTRONICS TECH CO LTD