常州Several common external faults of electric motors

The common external faults of electric motors are mainly manifested in the following aspects, and the methods for troubleshooting are also listed in the editor.

Fault 1: After being powered on, the motor cannot rotate, but there is no abnormal noise, odor, or smoke.

Method 1: Check the power circuit switch, fuse, and junction box for any broken points, and repair them if any.

Fault 2: If the motor does not rotate after being powered on, and then the fuse burns out, it may indicate a lack of one phase power supply or inter phase short circuit of the sub winding, grounding of the stator winding, incorrect wiring of the stator winding, and other reasons.

Method 2: Firstly, check if one phase of the knife switch is not closed properly, and the power circuit is a voltage withstand machine, turn to turn tester, and bridge to eliminate and identify the fault point one by one.

Fault 3: The no-load current of the motor is unbalanced, and if the three-phase difference is large, it may be due to the unequal number of turns of the stator three-phase winding, incorrect connection of the winding ends, imbalanced power supply voltage, inter turn short circuit in the winding, reverse coil connection, and other faults during rewinding.

Method 3: Eliminate and eliminate these faults one by one through winding inter turn impulse withstand voltage tester, bridge test, etc.

Fault 4: The no-load current of the motor is balanced, but the value is large.

Cause analysis: It may be due to excessive reduction in stator winding turns during repair, or the Y-connected motor being mistakenly connected Δ， Or during motor assembly, the rotor is reversed, causing the stator core to be misaligned and reducing the effective length. When dismantling old windings during major repairs, improper use of hot disassembly method may cause the iron core to burn out.

Method 4: These problems are repaired by eliminating them one by one. If the number of turns decreases, the stator winding is rewound to restore the correct number of turns. If the connection is incorrect, it should be changed to Y. If the assembly is incorrect and the iron core is burnt, it should be reassembled and repaired to solve the problem.

Zhejiang Jinsu Motor Co., Ltd. is an enterprise that manufactures various types of DC, AC, and three-phase asynchronous motors. The company covers a total area of over 30 acres and currently employs more than 150 employees; Having a modern garden style factory building and introducing excellent and efficient production and testing equipment from both domestic and international sources, we aim to create a sustainable manufacturing enterprise that provides customers with excellent products and services. As a modern enterprise that integrates scientific research, production, sales, and service, we are committed to building a sustainable business.