Electromagnetic thrust of a linear motor. Through the linear motor and rotating motor, speed controller output current given, the current control cycle is 50 æ , speed control cycle 200 kun, the entire control algorithm is completed by the fixed-point ADSP218.
The speed control diagram linear motor is SPM permanent magnet synchronous linear motor produced by the Huazhong University of Science and Technology, in order to be able to do low-speed control (where n = 1 represents the DC component; / 1 = 2 represents the fundamental component; etc. The middle pulsation period is 1000ms, the wavelength is 32.555mm (the pole pitch of the linear motor is 32mm, its fundamental wave wavelength is 64mm), the frequency is 2 times, and the middle even harmonic component is larger.
For a given speed harmonic analysis (1.9531 speed given at 4.88m/min, the speed of the linear motor and its harmonic analysis are shown in and shown respectively. The pulse period is 400ms, the wavelength is 32.533mm, and the frequency is GJ 丨2 times, the even harmonic components are even larger.
Harmonic analysis of the secondary rotating motor vdodtyoftherotarymotor, Table 2 is the percentage of the DC component of the comparison, and the first and fourth harmonic components ... ... Description harmonic content of the rotating machine is relatively small.
5 Concluding remarks Theoretical analysis and experiments in this paper show that: In the ideal current vector control, due to the end effect, the electromagnetic thrust of the permanent magnet synchronous linear motor contains larger harmonic components than the electromagnetic torque of the permanent magnet synchronous rotary motor, and it is mainly even. In the sub-harmonic component, part of the harmonic component is proportional to the q-axis current, and the other part of the harmonic component is quadratic to the q-axis current. This conclusion will provide a basis for weakening the harmonic components in the linear motor.
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