Synchronous motors and a control system thereof

Details Synchronous motors and a control system thereof Synchronous motors and a control system thereof

1986-11-26

1988-05-10

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318722, H02P 540

Patent

active

047438258

ABSTRACT:
In the prior art, a DC motor is often utilized for controlling speed of servomechanism for its simpleness in operation and excellent control. However, as a DC motor is equipped with brushes and commutators, it inconveniently requires periodical maintenance and inspections in order to keep normal operation. As electric semiconductors such as power transistors along with control technology have made a remarkable progress in recent years, a demand for motors which do not need maintenance is keenly felt. Studies have been conducted on control by DC motors and some have been put into practice. According to this invention, there is provided a synchronous motor which has a small field loss and which does not need slip rings or rotary transformers. Further, there is provided synchronous motor which can be simply constructed at a low cost without using a permanent magnet as a rotor and which can realize a larger capacity, and provided a control unit for the synchronous motor.

REFERENCES:
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Le-Huy et al., "Microprocessor Control of a Current-Fed Synchronous Motor Drive", Conference: Industry Applications Society IEEE-IAS Annual Meeting, Cleveland, OH, U.S.A., Sep. 30-Oct. 4, 1979.

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