I'm lightly going over some theory again and then I'll look at more papers.
Next question: Discuss the advantages and disadvantages of AC and DC motors. (no need to follow write an answer- just dot point it)
DC motor advantages:
- DC motors are used in most household appliances so if DC power transmission was instated, the current would not need to be rectified before being used
- Direct current can be used in superconducting wires with 0 heating loss, so the DC motors can be almost 100% efficient. The continual flux change of AC current causes power loss even in superconducting wires.
- Can have varied rotational speed without using gearing
disadvantages:
- DC motors have split ring commutators which are expensive to manufacture and can be unreliable
- Currently power distribution is AC so rectifiers must be used to provide DC current
AC motors:
- Transformers can only be used for AC current and this makes AC motors easy to use without having to change the direction of current.
- Cheaper to produce
- Less hassles with parts (slip rings do not cause as many problems as split ring commutators)
- Induction motors are easily linked to a three phase AC generator.
disadvantages:
- Synchronous motors must rotate in sync with the AC frequency, 3000 RPM, and to change this gearing must be employed
- Induction motors have considerable power losses and are inefficient
will add more when I think of them