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Selection of Power and Type of Permanent Magnet DC Motor

May 29, 2018

Permanent magnet DC motors are widely used in electrical and automation control instruments when they are in use. Their products are more useful in life. Even toothbrushes are made of permanent magnet DC motors and are now used as electric toothbrushes. With continuous development, the application of its equipment will become even more.

Selection of type of permanent magnet DC motor

Permanent magnet DC motors, to a certain degree, should be selected effectively for their high efficiency, low temperature rise, and inexpensive ferrite permanent magnet DC motors. Aluminium-nickel-cobalt permanent-magnet DC motor or rare-earth permanent magnet DC motor is considered only when the performance requirements are strict, the volume is small, and the ambient temperature is high.

Permanent magnet DC motor motor power

The maximum output power of the permanent magnet DC motor is limited. In the process of operation, if the power selection is small or the load exceeds the rated output power of the motor, the motor overload will occur. When the overload occurs, the motor will generate heat and vibration. If the speed drops, the sound is abnormal, etc., the motor will be burned if it is heavily overloaded. If the power is too large, it will cause economic waste. Therefore, it is very important to choose the power of the motor reasonably.

Permanent magnet DC motor specification selection

The permanent magnet DC motor will have a small degree of product specifications due to actual production. When selecting the product specifications, the torque and speed can be selected to a certain extent according to the actual needs in the occasions where the power supply and voltage are adjustable. When the operation is performed, the corresponding rating of the product is close to the specification, and the required rotation speed is obtained by changing the voltage. In the case where the power supply voltage is fixed, if the product of the appropriate specification is not available, the appropriate specification may be selected according to the torque, and the product The voltage and speed can be adjusted properly.

During the operation of the permanent magnet DC motor, if there is no special explanation, under normal circumstances, its equipment is not allowed to reverse braking operation under rated voltage, otherwise it will cause demagnetization of the permanent magnet; if it is necessary to do this mode of operation When adding a current limiting resistor, it is necessary to limit the current.