Inner power factor angle detection method of PMSM
A technology for permanent magnet synchronous motors and detection methods, which is applied in the control of generators, motor generators, AC motors, etc., and can solve problems such as poor robustness and complex calculations, so as to improve robustness and avoid algorithmic singularities , The effect of clear physical concepts
Active Publication Date: 2016-06-29
TSINGHUA UNIV
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[0004] Aiming at solving the internal power factor angle of the traditional method in vector control, it is necessary to reliably measure the stator current of each phase, and there are problems such as complex calculation and poor robustness. The present invention proposes a method for detecting the internal power factor angle of a permanent magnet synchronous motor
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[0020] The present invention will be further described below using the accompanying drawings and embodiments. The accompanying drawings described here are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation to the present invention.
[0021] This embodiment takes a two-phase permanent magnet synchronous motor as an example, including A-phase windings and B-phase windings, the two-phase windings are orthogonal in space, and the B-phase lags the A-phase by 90°. The rotary transformer is used as the rotor position sensor, and the electrical angle of the rotor position is 0° at the positive zero-crossing point of the no-load back EMF of the A-phase winding. The controller adopts the TMS320C28x of Texas Instruments (TI) TM A series of digital signal processing chips, which contain a timing interrupt source inside, and realize the calculation of the internal power factor angle ψ of the mot...
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The invention relates to an inner power factor angle detection method of a PMSM. The method is characterized by comprising a return-to-zero algorithm of a phase current zero-crossing electric angle scope, a determining method of phase current zero crossing, and a step of dynamically selecting different algorithms according to a variance when phase currents cross zero. According to the invention, a motor inner power factor angle is obtained by independently measuring the phase of each phase of currents during zero crossing. Real-time coordinate conversion is unnecessary, and the algorithm complexity is reduced. Measurement is performed only when the currents cross zero such that resolving errors caused by current distortion due to load dynamic change in a whole electrical period are avoided. A median value of the independently measured inner power factor angle of each phase can be calculated, detection abnormity caused by a current sensor fault is avoided, and the measurement robustness is improved. An interpolation algorithm and a mean value algorithm are dynamically selected according to the variance of the currents, and the performance is quite good under a high-speed or / and heavy-load condition and a low-speed or / and light-load condition.
Description
technical field [0001] The invention belongs to the technical field of motor control, and relates to a method for detecting an internal power factor angle of a permanent magnet synchronous motor. The method is suitable for controlling high-precision electric servo systems in aerospace, military equipment and industrial production. Background technique [0002] The current vector control method used in high-precision electromechanical servo systems requires accurate and real-time detection of the rotor position angle Coordinate transformation is performed on the current, and the armature current in the stator coordinate is transformed into the dq-axis current in the rotating coordinate and controlled. Acquisition of the internal power factor angle ψ is the key to realize the coordinate transformation, and the usual method needs to use the current sensor to detect the stator current of each phase accurately and in real time. The phase current under the measured stator coordin...
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Login to View More IPC IPC(8): H02P21/14H02P25/022
CPCH02P21/14
Inventor 和阳朱纪洪
Owner TSINGHUA UNIV