Characteristics of Permanent Magnet DC Motor

The permanent magnet brushless DC motor is a DC motor with one or more permanent magnets to establish the magnetic field. Its performance is similar to that of the separately excited DC motor with constant excitation current. It can be adjusted conveniently by changing the armature voltage. Compared with separately excited DC motor, it has the advantages of small size, high efficiency, simple structure and less copper consumption, and is the main type of small power DC motor.
 

Permanent magnet DC motor (PMDC) is a new controllable high-performance permanent magnet DC motor, which can ensure the optimization of electromagnetic characteristics by changing the input voltage. It has the characteristics of constant torque starting, controllable speed, stable operation, and is suitable for many applications.
 

The permanent magnet DC motor is characterized by excellent electromagnetic characteristics, which can provide high power and accurate torque regulation capability. Its rotor has built-in permanent magnet material. When the voltage is given, the electromagnetic force can be adjusted flexibly. Because permanent magnet DC motor uses soft magnet to store energy, it has higher efficiency and more constant output torque. In addition, the permanent magnet DC motor has the limit torque protection function, which can prevent the overload operation of the motor.
 

The permanent magnet DC motor has a wide range of applications. It can be used for the control of robots, toys, electronic appliances and other products. It has good speed, dynamic response and ultra-low noise, and is an ideal choice for industrial applications. In addition, permanent magnet DC motors can be used in solar tracking and positioning, automobile driving system, robot intelligent competition and other occasions, as well as industrial drive systems with low speed and high torque or high speed and low torque.

From the perspective of functional advantages, permanent magnet DC motor has the characteristics of large torque, good economy, long service life and strong anti-interference ability, which makes it better serve people's life and work environment.
 

Attention shall be paid to the following when applying permanent magnet DC motor:

1. If the product has no special instructions, it is generally not allowed to reverse the braking operation under the rated voltage, otherwise the permanent magnet will be demagnetized; If it is really necessary to operate in this way, a current-limiting resistor shall be added to limit excessive current.
 

2. Perform preliminary inspection on the motor according to the following steps:

First, check the appearance of the motor: there should be no scratches, bruises and peeling of the coating;

Then rotate the rotating shaft, which should be able to rotate flexibly without obvious jamming.

Check whether the wiring of the motor is firm and powered on for operation.

There should be no friction during the rotation of the motor, and the most prominent one is the bearing friction. After the bearing is worn, it will emit abnormal sound and local overheating and temperature rise will occur.
 

3. Pay attention to the demagnetization of permanent magnet caused by excessive current, temperature change and open circuit of magnetic circuit during disassembly and assembly of the motor. Especially for Al-Ni-Co permanent magnet motor, the magnetic circuit of permanent magnet shall be subject to magnetic short circuit protection during disassembly and assembly, otherwise additional magnetization shall be conducted after demagnetization.

SIVO Electric Motor is a high-tech enterprise in China that focuses on the R&D, manufacturing and sales of motors. The company has a technical management team with strong professional skills and management ability.