Example 1 An ore crusher with a drag motor of 15 kW. After the overhaul of the motor, the no-load operation is normal, but it cannot be loaded. When the load is added, the motor trips overload. After inspection, the mechanical and power aspects are normal. The DC resistance of the motor coil is 2.4Ω, 3.2Ω and 2.4Ω respectively. The three-phase no-load current measured by the clamp ammeter is 9A, 5A, 8.8A, respectively. malfunction. Remove the motor end cover and find that one of the wire ends of one phase winding has been loosened and the solder melts. The motor is double-wired and wound, one of which is disconnected and the other is still open, so the torque is reduced and it can only be idling, but it can not bear the load. Example 2 has a motor with a rated power of 13 kW. The coil rewinds the test machine. The motor rotates normally when the motor is running at no load. After the load is applied, the motor rotates slowly or even does not turn. The measured power supply voltage and phase resistance are normal. The three-phase no-load current is basically balanced by the clamp meter, but the current value is too small, which concludes that the winding connection error. Open the end cover and find that the motor that was originally connected to the △ connection is mistakenly connected to the Y connection method, so that the normal running torque is too small, with the fixed load, because the torque of the Y connection method is one third of the △ connection method. Example 3 A 4kW motor is used for a machine tool. After the power is turned on, the motor does not turn only when it is turned. Remove the motor line, measure the power supply side, the three-phase voltage is also normal, the winding DC resistance is also balanced, the insulation is qualified, and the mechanical rotation is flexible. After that, the no-load current is measured by a clamp-type ammeter on the motor lead on the lower side of the switch, and as a result, two phases have current, and one phase has no current. The wire is faulty in the wire. Pull out the inner wire of the steel pipe and find that a certain wire has been basically broken, like two needle tips, and there is white oxidized powder at the wire end. This is because the pulling force is too large when the pipe is worn, the wire is stretched and elongated, and the electric current is oxidized for a long time. At this time, the voltage can still be measured on the power supply line, but the current cannot be passed.
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