Electromechanical Prime Movers: Electric Motor Development by Peter C. Bell (eds.)

By Peter C. Bell (eds.)

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A logical extension to the use of these shaped bars is the use of a double cage design where there is no longer any direct electrical connection between the top and bottom of the conductor (Fig. 3G and H). With a double cage design the bottom cage lying in the high reactance region of the rotor carries little current at start, and hence has only a marginal influence on the starting performance of the machine. Conversely, the top cage, which almost entirely controls the starting performance, has correspondingly much Jess influence on the running performance.

Alternatively the field may be supplied with a half wave supply by connecting it across one of the bridge diodes. This may eliminate the other two diodes, and the lower voltage on the field winding usually reduces the cost of the winding. In a circuit now very popular for fractional-power (to 750 W) motors, cost is reduced by using only one thyristor but the voltage characteristics applied to the thyristor and the armature leave only a very short time available for the thyristor to turn off. The field current is an important factor in determining the turn off conditions and so the circuit can never work reliably unless an inductive load is connected across the bridge.

Liwschitz-Garik, Wipple, Alternating current machines. 4. R R Lawrence, Principles of alternating current machinery. 5. Miles Walker, The control of the speed and power factor of induction motors. The following papers give further information on specific aspects: Rawcliffe, Burbridge and Fong, Induction motor speed changing by pole amplitude modulation. Proc. lEE 105A August 1958. (Further papers in vol. 107A, 108A and 110). R A F Craven, Motor control gear for A. C. ships. Electrical 1lmes 24, 11, 1960.

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