At present, the multi-purpose method is to measure the back EMF off-line, and then calculate the optimal current for control(best motor for electric skateboard). It is worth noting that in order to produce constant electromagnetic torque, the waveform of back EMF must be an ideal trapezoid wave with a flat top width greater than 120 °(bldc 6374 motor 170kv), and the sinusoidization of winding back EMF caused by the inclined slot or pole will increase the electromagnetic torque wave.
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Commutation torque ripple is the main cause of torque ripple(electric skateboard hub motor). The fractional slot method can improve the frequency of the fundamental wave of cogging torque and reduce the cogging torque pulse. However, when fractional slots are used, the distribution of the windings at each pole is asymmetric(bldc 6384 motor), so that the effective torque component of the motor is partially offset, and the average torque of the motor will be reduced accordingly.
There are many literatures at home and abroad for analysis and research(mini remote control). At the same time, this optimal current method can also eliminate cogging torque ripple. In addition, the iron loss of motor caused by PWM modulation and commutation is analyzed(best off road skateboard brushless motor). Because offline measurement is needed in advance, the most prominent problem of the permanent magnet BLDCM is the torque ripple, its feasibility is greatly reduced.
This section only analyzes the commutation torque ripple which has a great influence on the motor speed regulation performance(electric motor for skateboard). The magnetic slot mode reduces the influence of stator slot opening and makes the air gap between stator and rotor more uniform, thus reducing the torque ripple caused by cogging effect(5065 bldc inrunner motor 270kv). Due to the poor magnetic conductivity of magnetic slot die materials, the reduction of torque ripple is limited.
However, the use of closed slots will not only bring great inconvenience to the winding embedding(screen remote control), but also greatly increase the slot leakage reactance, increase the time constant of the circuit, thus affecting the dynamic characteristics of the motor control system(belt drive electric skateboard motor). At present, which will directly reduce the control characteristics and the reliability of the drive system, and bring vibration, resonance, noise and other problems.
For the control of permanent magnet BLDCM(best electric skateboard motor), when the back EMF of BLDCM is not the ideal trapezoidal wave, and the control system still supplies square wave current according to the ideal trapezoidal wave, it will cause electromagnetic torque ripple. One solution is to make the wave form of back EMF close to the ideal wave form as much as possible(electric skateboard esc dual motor), so as to reduce the electromagnetic torque ripple.
For example, for the motor with surface bonded magnetic steel structure, radial magnetization is often used to make the air gap magnetic density closer to square wave(upgrade remote control). For example, in order to increase the flat top width of the back EMF of BLDCM, the whole distance concentrated winding is often used(6374 190kv 3150w). Another solution is to find the best stator current waveform to eliminate the torque ripple.