Differences and characteristics between permanent magnet motor and ordinary motor

First, there is no need for an excitation coil, which is efficient and energy-saving.

Compared with general motors, permanent magnet motors have high power density, which mainly means that permanent magnet motors have small volume and large power generation or output. Compared with general motors, it can save energy by 20%-40%. The rotor structure of permanent magnet motor is different from that of general motor, and permanent magnet poles are installed on the rotor of permanent magnet motor. Generally, the motor rotor is equipped with an excitation coil, and the magnetic field only exists when the required current is turned in.

Compared with the traditional motor, it can save electricity at any speed, especially at low speed. Modern submarines mostly use large diameter, low speed, 7-blade large inclined propeller or pump jet propeller, which has low rotation speed and high propulsion efficiency. Moreover, submarines mostly maneuver at low noise speed underwater, which makes this advantage of permanent magnet motor better reflected and brought into play.

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Second, small size and light weight.

The permanent magnet motor has a simple structure. Due to the use of high-performance permanent magnet data to provide magnetic field, the air gap magnetic field of permanent magnet motor is greatly enhanced compared with that of general motor, while the volume and shape of permanent magnet motor are greatly reduced, and the size and shape of motor are flexible and diverse.

Third, the failure rate is low and it is widely used.

Due to the use of high-performance rare earth permanent magnet data to provide magnetic field, the failure rate is lower and it is more and more widely used.

Fourth, the starting torque is large.

Because the rotor winding does not work during the normal operation of the permanent magnet motor, the rotor winding can meet the requirements of high starting torque in design, for example, from 1.8 times to 2.5 times or more.