lications 15. l. What part of a DC motor is identified by each of the following

Question

lications 15. l. What part of a DC motor is identified by each of the following lead designations? a. Al and A2 16 b. S1 and S2 c. Fl and F2 List the three general types of DC motors. What two factors determine the direction of rotation 18 of a DC motor? In what phase configurations are AC induction motors available? 8. What terms are used to identify the rotating and stationary parts of an AC induction motor? Call connection to the squirrel-cage rotor used in AC induction motors. 21 10. Outline the starting sequence of a split-phase motor. 11. Assume the direction of rotation of a split-phase motor needs to be reversed. How is this done? 22. W 2. A dual-voltage split-phase motor is to be connected us for the lower voltage. What connection of the two dr run windings would be used?

Explanation / Answer

5. List the three general types of Dc motors:

1. Permanent magnet motors

2. Series motors

3. Shunt motors

Permanent magnet motors:-

The field poles of this motor are essentially made of permanent magnet. A PMDC motor mainly consists of two parts. A stator and an armature. Here the stator which is a steel cylinder.

Series motors:-

In a series DC motor the field is connected in series with the armature. The field is wound with a few turns of large wire because it must carry the full armature current.

Shunt motors:-

A shunt DC motor connects the armature and field windings in parallel or shunt with a common D.C. power source. This type of motor has good velocity instruction even as the load vary, but does not have the starting torque of a series DC motor.

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