Torque Control Method of Permanent Magnet Synchronous Motor
A permanent magnet synchronous motor and torque control technology, which is applied in the field of electric power transmission, can solve the problems of difficult real-time parameters of the motor and the difficulty of high-precision torque control, so as to improve the current utilization rate, reduce the workload, The effect of ensuring torque control accuracy
Active Publication Date: 2019-04-05
SHANGHAI ZHONGKE SHENJIANG ELECTRIC VEHICLE
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Problems solved by technology
[0002] The permanent magnet synchronous motor used in new energy vehicles cannot be installed with a torque sensor on the motor shaft end, so the torque control of the motor is not a closed-loop control, but an open-loop control, so there is a need for high-precision torque control. greater difficulty
[0003] According to the modern motor control theory, there is a clear mathematical model for the permanent magnet synchronous motor itself, and there is also a clear mathematical formula for the motor torque, but the torque formula is heavily dependent on the relevant parameters of the motor (especially the AC-D axis inductance L d L q ), and the motor parameters change with the operation of the motor, it is very difficult to obtain the real-time parameters of the motor, so it is difficult to use the motor torque formula to realize the open-loop control of torque and ensure a certain torque accuracy
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[0046] In order to describe the technical content of the present invention more clearly, further description will be given below with reference to specific embodiments.
[0047] In a feasible implementation manner, the torque control method for a permanent magnet synchronous motor includes the following steps:
[0048] (1) Carry out the MTPA angle experiment, and draw a two-dimensional table of the torque on the MTPA angle and the target current;
[0049] (2) Fit the optimal MTPA angle to a line about the target current i s the quartic curve of , and get the quartic polynomial of the curve;
[0050] (3) Carry out a bench experiment, and draw a two-dimensional table of the target current about the current speed and target torque;
[0051] (4) According to the two-dimensional table of the target current about the current speed and the target torque, the actual required target current is obtained through the proportional interpolation algorithm;
[0052] (5) Calculate the corr...
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The invention relates to a permanent magnet synchronous motor torque control method. The method comprises the following steps: (1) a MTPA (Maximum Torque Per Ampere) angle experiment is carried out, and a two-dimensional table for the torque in relative to the MTPA angle and target current is drawn; (2) the best MTPA angle is fit to a quartic curve in relative to the target current i<s>, and a quartic polynomial for the curve is obtained; (3) a bench experiment is carried out, and a two-dimensional table for the target current in relative to the current rotation speed and the target torque is drawn; (4) according to the above tables, the actually-needed target current is obtained through a proportional interpolation algorithm; and (5) according to the obtained target current, corresponding voltage is calculated, and the motor is controlled. by adopting the method of the invention, the current utilization rate of the motor is improved; the torque control accuracy is ensured in a full range; and the workload for preliminary data acquisition and later data processing optimization is reduced.
Description
technical field [0001] The invention relates to the technical field of electric power transmission, in particular to the technical field of maximum torque-current ratio control and torque control precision of a permanent magnet synchronous motor, in particular to a torque control method of a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor used in new energy vehicles cannot install a torque sensor on the shaft end of the motor, so the torque control of the motor is not a closed-loop control, but an open-loop control, so the realization of high-precision torque control exists. greater difficulty. [0003] From the modern motor control theory, it can be seen that there is a clear mathematical model for the permanent magnet synchronous motor itself, and there is also a clear mathematical formula for the motor torque, but the torque formula is heavily dependent on the motor-related parameters (especially the AC and direct a...
Claims
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IPC IPC(8): H02P6/08
CPCH02P6/085H02P2207/05
Inventor浦蓉杰高翔林利赵艳张正刚朱俊瑟罗彩煌吴炽海金志辉
OwnerSHANGHAI ZHONGKE SHENJIANG ELECTRIC VEHICLE