If a synchronous motor fails to start, various issues could be the cause:
1). Insufficient Starting Torque
2). Loss of Excitation
3). Incorrect Phase Sequence
4). Supply Voltage Issues
5). Mechanical Blockage
6). Starter Fault
7). Damaged Stator (or) Rotor Windings
1). Insufficient Starting Torque
The motor may not have enough starting torque to overcome the load, resulting in failure during first movement.
2). Loss of Excitation
The field winding of the motor requires a direct current source (DC). If this excitation is missing or inadequate, the motor will not start.
3). Incorrect Phase Sequence
If the supply’s phase sequence is incorrect, the motor will not start or will revolve in the wrong direction.
4). Supply Voltage Issues
A low or uneven supply voltage might restrict torque & prevent the motor from starting properly.
5). Mechanical Blockage
The motor may be mechanically jammed (or) under excessive load, stopping it from turning.
6). Starter Fault
Issues with the starting or its control circuit, such as a faulty switch, relay, or contactor, may cause the motor to stop working.
7). Damaged Stator (or) Rotor Windings
Open (or) short circuits in the windings can prohibit the motor from producing the magnetic field required to start.
Identifying and resolving these issues can assist guarantee that the motor starts & performs properly.
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