What are the different types of DC motors and determine speed and electromagnetic torque for a 230 V shunt motor at 36 A with same flux?
Short answer
| Type | Field Connection | Speed vs Load | Starting Torque |
|---|---|---|---|
| Shunt | Parallel | Nearly constant | Moderate |
| Series | Series | Falls sharply | High |
| Compound | Both | Intermediate | Intermediate |
- DC motor types: shunt, series, compound
- Speed formula: 1200 rpm × ((230 − 36×0.25) / (230 − 6×0.25))
- Torque formula: ((230 − 36×0.25) × 36 × 60) / (2π × speed) Nm
- Key relationships: back EMF ∝ speed (constant flux), torque ∝ armature current (constant flux)
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class IV section of the Marine One forum, open to members enrolled for the MEO Class IV exam.