Causes and preventive measures of explosion-proof permanent magnet motor heating

We have learned about the maintenance and upkeep of explosion-proof permanent magnet motors before. It can be seen that regular maintenance and upkeep of this motor can effectively extend its life and improve work efficiency. However, the explosion-proof permanent magnet motor does not rely on fans to dissipate heat like ordinary permanent magnet motors. It requires manual operation to dissipate heat. When it is working for a long time, it may generate heat. So what are the reasons why explosion-proof permanent magnet motors heat up? And how to prevent it? The editor below will introduce it to you in detail!

There are many reasons why explosion-proof permanent magnet motors heat up for no reason. The editor has listed them here for your reference only:

(1) The indoor room temperature used by the explosion-proof vibration motor is too high

(2) Poor local heat dissipation of the motor

(3) Overvoltage and undervoltage or unbalanced voltage during operation

(4) Frequent equipment starts and stops or equipment frequently rotates forward and reverse

(5) Explosion-proof vibration motor lacks phase

(6) The machine is stuck or blocked inside.

(7) Motor turns-to-turn short circuit

(8) The wiring inside the explosion-proof vibration motor is incorrect

(9) The star-delta wiring is incorrect

(10) The motor is damp

(11) Winding disconnection or unbalanced resistance caused by the rotor of the wound asynchronous motor

(12) The rotor is swept.

(13) Reduced dead center magnetic flux caused by motors that have been repaired many times

(14) Internal bearings are short of oil

(15) The winding process of some explosion-proof vibration motors is too poor.

The temperature rise exceeds the nameplate specification under rated load. No matter what the situation is, the motor is faulty and must be shut down for inspection. Pay special attention to the sudden increase in temperature rise.

The external reasons include: the grid voltage is too low or the line voltage drop is too large (more than 10%), the load is too heavy (more than 10%), and the motor and machinery are not properly coordinated.

Internal reasons include: single-phase operation, turn-to-turn short circuit, phase-to-phase short circuit, stator grounding, fan damage or not tightened, air duct obstruction, bearing damage, stator and rotor phase friction, motor and cable joint heating (especially copper-aluminum or aluminum-aluminum) connection), the motor is corroded or damp, etc.

The temperature rise does not exceed the temperature rise limit under the rated load. The motor temperature exceeds the allowable operating temperature only because the ambient temperature exceeds 40°C. This phenomenon shows that the explosion-proof motor itself is normal. The solution is to use artificial methods to lower the ambient temperature. If this is not possible, the load must be reduced.

Precautions are as follows:

1. Regularly remove dust on the surface of the explosion-proof permanent magnet motor to ensure a good working environment for the explosion-proof vibration motor.

2. Explosion-proof permanent magnet motors should be used in places with good ventilation. There is generally no problem in winter. In summer, electric fans can be used to cool down.