Will Instantaneous Starting Of A Brushed DC Motor Cause Magnet Demagnetization?

Instantaneous starting of a brushed DC motor can indeed cause magnet demagnetization. The following are the specific reasons:

● Instantaneous starting generates high heat: During instantaneous starting of a brushed DC motor, the rapid increase in current generates a large amount of heat inside the motor. If this heat cannot be dissipated quickly, the motor temperature will rise.

● High temperature causes magnet demagnetization: Magnetic elements are sensitive to temperature. When the temperature exceeds their Curie temperature, the magnetism of the element will significantly weaken or even disappear, a phenomenon known as demagnetization. The high temperature generated by instantaneous starting can easily cause the element to reach or exceed its demagnetization temperature.

● The impact of demagnetization on motor performance: When magnet elements are demagnetized, the motor's magnetic field strength weakens, which in turn affects the motor's output torque and efficiency. In severe cases, this can cause the motor to malfunction and shorten its service life.

Therefore, when designing and using a brushed DC motor, it is important to consider the motor's starting method and heat dissipation conditions to avoid magnet demagnetization.