Basic methods for selecting permanent magnet motor protectors

The permanent magnet motor is a new type of mechanical equipment. In fact, it is an AC motor. Its stator runs on three-phase alternating current, and the rotor is a permanent magnet. The advantage of this kind of motor is that the AC power energy is provided by DC, so that the permanent magnet motor can be controlled accurately, and it also solves the problem of brush life.

What is the relationship between the selection of permanent magnet motor protectors, the motor and the protector? So in response to this problem, the editor will introduce in detail the basic method of selecting a permanent magnet motor protector!

The basic methods for selecting permanent magnet motor protectors are as follows:

1. Motor: First of all, you must understand the model specifications, motor functional characteristics, protection type, rated voltage, rated current, rated power, power frequency, insulation level, etc. of the permanent magnet motor. Because these contents can basically provide users with accurate reference on how to correctly use, maintain and select protectors.

2. Environmental conditions: mainly refers to normal temperature, high temperature, high cold, corrosion, vibration, wind and sand, altitude, electromagnetic pollution, etc.

3. Motor usage: Mainly refers to the requirements and characteristics of permanent magnet motors for driving mechanical equipment, such as fans, water pumps, air compressors, lathes, oil field pumping units and other different load mechanical characteristics.

4. Control system: The control modes include manual, automatic, local control, remote control, independent operation of a single machine, centralized control of the production line, etc. The corresponding starting methods are: direct, step-down, star-delta, frequency-sensitive rheostat, frequency converter, soft start and other starting methods.

5. Other aspects: Whether many users are more casual or strict about on-site production monitoring and management, the severity of the impact of abnormal shutdowns on production, etc., must be taken into consideration.

There are many factors that affect the selection of permanent magnet motor protectors, such as the installation location, power supply conditions, cooperation with the power distribution system, etc.; it is also necessary to consider whether the protection configuration of the newly purchased motor, the protection upgrade of the motor, or the risk of accidents The improvement of motor protection, etc.; the difficulty of changing the motor protection method and the impact on production must also be considered; the selection and adjustment of the protector must be comprehensively considered based on the actual working conditions on site.