| 摘要 |
The induction motor includes a field winding(4) connected to a voltage source(1) through a conduction control circuit(20) and a switch(3). A tertiary winding or a control winding(9) is electromagnetically coupled to the main winding(41). The control winding (9) and a capacitor(10) serve as an impedance for a closed loop. The conduction control circuit(20) is formed as a phase control circuit and comprises a triac(201). A series connection of a resistor(202) and a capacitor(203) is connected in parallel with the triac(201) for the purpose of preventing erroneous ignition or triggering of the triac (201).
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