Discussion
Match the drive with its slip power path.
1. Rotor resistance control 2. Static Kramer 3. Static Scherbius
P. Returned to the supply in one direction Q. Dissipated as heat R. Exchanged with the supply in both directions
Answer: D
Correct answer: 1-Q, 2-P, 3-R
Rotor resistance control dissipates the slip power as heat in the external resistors, which is Q. A static Kramer drive uses a diode rectifier, so slip power can only leave the rotor and return to the supply, which is P and confines the machine to sub-synchronous speeds. A static Scherbius drive uses a bidirectional converter and can both take power from the rotor and inject it, which is R and allows super-synchronous running.
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