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How to determine if a three-phase motor has burned out

How to determine if a three-phase motor has burned out

To determine whether a three-phase motor has burned out, the following methods can be used:Observation method、Resistance measurement method、Current measurement method、Other methods

29

2025

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03

Reasons and solutions for motor winding misconnection faults

Reasons and solutions for motor winding misconnection faults

Method for handling incorrect connections of motor windings：(1) If a coil or coil group is connected in reverse, there will be a significant imbalance in the no-load current and it should be repaired at the factory. (2) If the lead wire is incorrect, it should be correctly judged at the beginning and end before reconnecting. (3) In case of incorrect connection during decompression start-up, refer to the wiring diagram or schematic diagram and carefully check and rewire. (4) If the wiring of a new motor is incorrect after being taken offline or reconnected to a new winding, it should be sent to the factory for repair. (5) When the stator winding is reversed in phase, the current of the reversed phase is particularly high. Based on this characteristic, faults can be found and repaired. (6) If the "Y" shape is connected to a "△" shape or the number of turns is insufficient, the no-load current is high and should be corrected in a timely manner.

28

2025

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03

Reasons and solutions for the occurrence of open circuit faults in motor windings

Reasons and solutions for the occurrence of open circuit faults in motor windings

Methods for handling open circuit faults in motor windings：(1) When the circuit is broken at the end, it should be welded firmly after connection, wrapped with insulation material, covered with insulation tube, tied up, and then dried. (2) If the winding is severely burnt due to inter turn, inter phase short circuit, grounding and other reasons, it should generally be replaced with a new winding. (3) Emergency treatment shall be carried out for a small number of broken points in the slot. The grouping elimination method shall be used to identify the broken points, and they shall be connected and insulated properly in the winding break section before use. (4) Welding, cold welding, or strip replacement can be used to repair the broken cage of the cage shaped rotor.

26

2025

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03

Reasons and solutions for short circuit faults in motor windings

Reasons and solutions for short circuit faults in motor windings

Short circuit treatment method for motor winding：(1) The short-circuit point is at the end. Insulation materials can be used to separate short-circuit points, or insulated wires can be re wrapped, painted, and re dried. (2) Short circuit in the online slot. After softening it, find the short circuit point and repair it. Put it back into the cable tray and then paint and dry it. (3) For each phase winding with less than 1/12 of the short circuit turns, all short circuits should be cut off when the number of turns is connected in series, and the conductive parts should be connected to form a closed circuit for emergency use. (4) When the number of turns at the short-circuit point of the winding exceeds 1/12, it should be completely removed and rewound.

24

2025

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03

Analysis and Handling Methods of Motor Winding Faults

Analysis and Handling Methods of Motor Winding Faults

The analysis and handling methods for motor winding faults include: fault symptoms, causes, inspection methods, as well as high-voltage testing methods, magnetic needle exploration methods, power frequency vibration methods, and other handling methods

18

2025

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03

Basic concepts and classifications of motor maintenance

Basic concepts and classifications of motor maintenance

Motor maintenance is available： Basic concepts、Classification、Classification details、 Classified by start-up and operation mode、Function、Classification by rotor structure、Classified by operating speed

16

2025

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03

Motor schematic symbols

Motor schematic symbols

The schematic symbols of electric motors mainly consist of circular outlines, three-phase motor identification "3M", and AC identification "~", sometimes with limiting symbols added to indicate specific types or uses. In electrical circuits, electric motors are usually labeled with the letter "M".

13

2025

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03

Formula for calculating motor torque

Formula for calculating motor torque

The calculation formula for motor torque is: [ T = \frac{9550P}{n} ]

10

2025

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03

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