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Cause Analysis Of Three-phase Asynchronous Motor Inspection Test Failure
- Jan 11, 2019 -

Cause Analysis of Three-phase Asynchronous Motor Inspection Test Failure

The test is divided into two types: type test (also called confirmation test) and inspection test (also called routine test or factory test). The newly designed motor or new process plan must be verified by type test. Different inspection tests have two major features: 1) one-by-one test, and 2) single-machine motor manufacturer inspection test data.

When the factory test data exceeds the standard, it should be analyzed to find out the cause and try to solve it. Ms. Participate in the abnormal appearance of the factory test and its causes are summarized and shared.

Do not start after power on

(1) Two-phase circuits in the power distribution equipment are not connected. The problem usually occurs on the switch contacts.

(2) There is a two-phase circuit in the motor that is not turned on. The problem usually occurs at the wiring location.

Slowly turn on after power-on and make a "beep"

(1) One phase circuit in the power distribution equipment is not connected or the contact is not true. The problem usually occurs at the fuse, switch contact or wire contact. For example, the fuse of the fuse is blown, the contactor or the air switch has three-phase electric contact pressure imbalance, the wire connection point is loose or oxidized.

(2) One phase circuit in the motor is not connected. The problem usually occurs at the wiring location. If the connecting piece is not pressed, the insulating material such as the insulating sleeve is placed between the lead wire and the terminal, the internal wiring of the motor is leaked or the node is loose, and the one-phase winding has an open circuit fault.

(3) There are serious inter-turns, phase-to-phase shorts or shorts to ground in the windings.

(4) There is a phase winding of the one-phase winding that is crossed or reversed or that has a reversed coil inside the winding.

(5) Fixed and rotor severe rubbing (commonly known as “broom”).

(6) The power supply voltage is too low.

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