What is the electric motor locked torque? How to deal with a motor locked torque?

一，What is the 3 phase induction motor locked torque? How to deal with a motor locked torque?

Three phase induction motor locked torque is a situation where the motor still outputs torque when the speed is 0, which is generally mechanical or man-made. The motor cannot start or stops rotating due to excessive motor load, mechanical failure of the drag, bearing damage and bore sweeping. The power factor of the motor is extremely low when it is locked torque. and the current (called locked current) when it is stalled can be up to 7 times the rated current. If it lasts for a long time, it will burn out the motor. Therefore, the general test of the motor includes the locked torque test.

二，Causes of motor locked torque

There may be many reasons for motor locked torque. Here are some common reasons:

1. Internal fault of the motor, such as bearing damage, rotor stuck, stator winding short circuit, etc.;

2. Power supply failure, such as abnormal power supply voltage, power supply short circuit, etc.;

3. The motor mechanical load is too large or the load is abnormal, such as too tight bearing, too large load, transmission component failure, etc.;

4. Control system failure, such as control signal error, controller damage, etc.;

5. Other reasons, such as poor circuit contact, improper motor maintenance, etc.

When the motor is locked torque, it is necessary to troubleshoot the fault in time to avoid damage to the motor. You can check the motor's internal, power supply, mechanical load and control system to find the cause, find the fault point and repair it.

三，How to deal with motor locked torque?

Motor locked torque is a common fault, and the treatment method is as follows:

1. Cut off the power supply: After the motor locked torque, the power supply should be cut off immediately to prevent the motor from continuing to run, so as not to damage the motor and equipment.

2. Troubleshoot the cause of the fault: Check whether the various components of the motor are normal, such as bearings, mechanical parts, wire connections, etc., to find the cause of the fault.

3. Repair or replace parts: Repair or replace the faulty parts according to the actual situation to ensure that the motor parts are operating normally.

4. Restart the three-phase motor: After confirming that all parts of the motor are operating normally, reconnect the power supply, start the motor for trial operation, and ensure that the motor operates normally.

It should be noted that regular maintenance should be carried out before the motor locked torque, the inside and outside of the motor should be cleaned in time, and the use of each component should be checked to prevent the occurrence of faults. At the same time, during use, the motor should also be avoided from overloading and the motor should be protected.