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The requirements of micro DC motors and small brushless DC motors for magnetic materials

Both micro DC motors and small brushless DC motors use magnetic tiles or magnetic rings, but the main difference between them is the different magnetization requirements.In the magnetization waveform, we can judge the magnetization quality mainly by observing several parameters in the waveform: average extreme value, range and area (or duty cycle).The average extreme value indicates whether the performance of magnetized or magnetic steel meets the requirements of the product;The range indicates how uniform the magnetization is;Area (or duty ratio) shows the size of the magnetizing waveform, in the same extreme value, its size determines the size of the motor output, but the greater it is, the greater the motor positioning torque, rotation up feel bad.Generally in the DC motor, the output is required to be large, so the space is relatively large;The brushless motor requires stable rotation, and it has an index — torque fluctuation, especially at low speed. The smaller the torque fluctuation, the closer the magnetizing waveform is to the sine wave.This is that we require the rising edge of the magnetizing waveform to rise smoothly and slowly.