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The principle of slip ring motor, can you use the resistor?

Update:14 Sep 2018
Summary:

The slip ring motor is the rotor winding (not the cast […]

The slip ring motor is the rotor winding (not the cast aluminum squirrel cage). The winding wire is terminated to the slip ring, and the rotor winding can be connected to the resistor to achieve soft start when the motor starts, reducing the starting surge current. Whether it is possible to not connect the resistor, it depends on the power supply capacity and the specific conditions of the load. When the power supply capacity and the margin are sufficiently large, the transformer capacity is 2-3 times larger than the motor power and is not fully loaded, and in the power system, When other electrical load does not have much requirement for short-time voltage drop, you can remove the resistor and start it directly (short the slip ring to seal the star). In particular, the motor load is a fan type (pump type) load that meets the above conditions and can be directly started at full pressure. When it is not a ventilator type load, if the idling start is added after the start, the load can also be started at full pressure.
The slip ring is composed of a conductive ring, a tail brush, a brush holder, a conductive rod, a collector ring, and a slip ring cover. The winding of the wound rotor is similar to the stator winding. The three-phase windings are connected in a star shape. The beginning of each phase winding is connected to three copper slip rings, and the slip ring is fixed on the rotating shaft. The ring and the ring, the ring and the rotating shaft are insulated from each other, and are connected to the external circuit through a set of spring-loaded carbon brushes.

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