A low-speed position estimation method for permanent magnet synchronous motors without high-frequency signal injection
A permanent magnet synchronous motor, low-speed position technology, applied in the direction of single motor speed/torque control, control of generators, motor control, etc., can solve problems such as poor control quality, improve efficiency, reduce system loss, and improve accuracy Effect
Active Publication Date: 2020-05-05
ZHEJIANG UNIV OF TECH
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Problems solved by technology
[0004] In order to overcome the shortcomings of the high-frequency signal injection method itself and the poor control quality of the existing permanent magnet synchronous motor control method without a position sensor, the present invention provides a PMSM low-speed position sensorless control method without high-frequency signal injection, which improves the control quality of the PMSM. Quality of position sensor control
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[0052] The present invention will be further described below in conjunction with the drawings.
[0053] Reference Figure 1 ~ Figure 5 , A position sensorless control method for low-speed permanent magnet synchronous motors without high-frequency signal injection. A position sensorless control strategy based on asymmetric SVPWM collects five stator phase currents in each switching cycle to obtain αβ two-phase stationary through Clarke coordinate transformation. The current is in the coordinate system, and the position estimation algorithm based on asymmetric SVPWM modulation is used to obtain the error value of the position information. Finally, the PLL is used to track the error to obtain the speed and integrate to obtain the angle value.
[0054] Referring to Figure 2, the conventional symmetrical SVPWM technology uses two adjacent effective voltage vectors and zero vectors of the target voltage vector Synthesis. Therefore, the effective voltage vector action time in the low mod...
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A permanent magnet synchronous motor low speed section position sensorless control method without high frequency signal injection is disclosed. An asymmetric space vector pulse width modulation methodis adopted, three effective voltage vectors with electrical angle difference of 120 degrees and one zero vector are used to synthesize a target vector, so that when the system is in the low modulation region or even the output target voltage vector is zero, the three effective vectors are not zero in the action time and large enough to ensure detection of the phase current change under the actionof the effective voltage vectors; based on the inductance convex polarity principle, the current variation of three effective voltage vectors and one zero vector are calculated, and a rotor positionis estimated from those current variations including position information. The invention can realize low speed segment position sensorless control without high frequency signal injection.
Description
Technical field [0001] The invention belongs to the field of permanent magnet synchronous motor control, and particularly relates to a position sensorless control method of a permanent magnet synchronous motor in a low speed section. Background technique [0002] Permanent Magnet Synchronous Machine (PMSM) is widely used in rail transit, robots, household motors and other fields due to its advantages of high efficiency, large power density and wide speed range. The PMSM sensorless control system has the advantages of low cost, small size, and low failure rate because it eliminates the position or speed sensor, which has attracted wide attention from experts, scholars and industry. [0003] The conventional permanent magnet synchronous motor low-speed position sensorless control needs to inject high-frequency signals to excite the salient pole characteristics of the motor inductance, and obtain rotor position information from the high-frequency current. However, the injected high-f...
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IPC IPC(8): H02P21/04H02P21/24H02P27/12H02P21/18H02P6/08
CPCH02P6/08H02P21/04H02P21/18H02P21/24H02P27/12H02P2207/05
Inventor 吴春陈子豪黄希
Owner ZHEJIANG UNIV OF TECH