Curve fitting-based maximum torque current control method
A technology of maximum torque current and control method, applied in motor generator control, electronic commutation motor control, control system, etc., can solve the problems of dependence on motor body parameters, influence of control accuracy, and high complexity, and achieve data saving The effect of storage capacity, elimination of dependencies, and simplified control
Active Publication Date: 2017-05-10
ZHEJIANG GEELY HOLDING (GROUP) CO LTD +1
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The disadvantage of this invention is that the control accuracy is affected by the size of the data in the table, and at the same time, the complexity of the control is high, the performance of the system is low, and it also depends on the parameters of the motor body
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[0065] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0066] Such as figure 1 In the described embodiment, a maximum torque current control method based on curve fitting, according to the principle of vector control, the electromagnetic torque equation of the motor is simplified, and in a steady state, the currents of the d-axis and q-axis of the motor The component is a constant value, and the Newton iterative method is used to expand the above equation, so as to obtain the partial derivative matrix, and then set a convergence condition, and use the numerical analysis method in Matlab to obtain the corresponding curve relationship between the electromagnetic torque and the d-axis component function of the current, and the curve is close to It is a single branch of the quadratic curve, and the equivalent three-segment quadratic curve is synthesized, and the least square method is used to simulate ...
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The invention discloses a curve fitting-based maximum torque current control method. According to a vector control principle, an electromagnetic torque equation of a motor is simplified, and d-axis and q-axis current components of the motor are constant values in a steady-state condition; the equation is expanded by using a newton iteration method to obtain a partial derivative matrix, and a convergence condition is set; a corresponding curve relationship between electromagnetic torque and a d-axis current component function is obtained by using a numerical value analysis method in Matlab, the curve is close to a single branch of a quadratic curve, equivalent three-segment quadratic curve synthesis is carried out and simulated approaching is carried out by adopting a least square method; and a continuous function relationship is built by the electromagnetic torque and the d-axis current component of a stator, and the d-axis component can be quickly output. The curve fitting-based maximum torque current control method has the beneficial effects that the dependence on parameters of the motor is eliminated, the data memory capacity of an original system is reduced, the operating rate is increased, the performance of the system is improved, the minimum current under the maximum torque is optimized and the efficiency of a motor control system is improved.
Description
technical field [0001] The present invention relates to the technical field related to permanent magnet synchronous motors, in particular to a maximum torque current control method based on curve fitting. Background technique [0002] Energy-saving and high-efficiency, for salient pole permanent magnet synchronous motors, are specifically manifested in: saving costs and improving efficiency. To achieve these goals, not only higher standards are put forward for the design and processing technology of the motor, but also very high requirements are put forward for the motor control system. At present, the realization of the maximum torque / current control method mainly includes the look-up table method and the linear simplification method. Although the look-up table method achieves the maximum utilization of the system current, its control accuracy is affected by the amount of data in the table. To obtain high accuracy, there must be a large number of discrete points, which wil...
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IPC IPC(8): H02P21/22
Inventor 王力王荣华宋光辉
Owner ZHEJIANG GEELY HOLDING (GROUP) CO LTD