What's the difference between squirrel cage motor and wound motor? Do squirrel-cage motors need only one power trip, while wound-rotor motors need two trips?

In the teaching material of electric drive, there is an example when the motor starts.

Rotor series resistance starting of wound motor. The speed can be adjusted in a small range.

The advantage of winding type is that it has large thrust and can adapt to higher load. But maintenance is more troublesome because there are many structures.

The advantages of squirrel-cage type are simple structure and low cost. It is the main product in the automobile market.

Do squirrel-cage motors need only one power trip, while wound-rotor motors need two trips?

be

Cold start and hot start generally refer to high voltage motors.

Cold start: Cold start refers to the interval between this start and the last start. If it is greater than the value specified by the manufacturer, it is a cold start.

Hot start: cold start refers to the interval between this start and the last start. If it is less than the value specified by the manufacturer, it is a hot start.