Claims
- 1. An induction motor driving system operatively connected to an induction motor generating a rotational speed signal and a driving supply voltage and operatively connected to receive an exciting current command signal, said induction motor driving system comprising:
- exciting current amplitude controlling means, operatively connected to the induction motor, for receiving the rotational speed signal and outputting an amplitude signal;
- means, operatively connected to said exciting current amplitude controlling means and the induction motor, for receiving the amplitude signal and increasing the current amplitude of the induction motor in dependence upon the amplitude signal;
- detecting means, operatively connected to the induction motor, for receiving and detecting the level of the driving supply voltage of the induction motor and varying the rotational speed signal in accordance with the level of the driving supply voltage;
- a supply voltage output circuit providing a supply voltage; and
- a level changer, operatively connected between said supply voltage output circuit and said exciting current amplitude controlling means, for receiving and level changing the supply voltage and providing the level changed supply voltage and the rotational speed signal to said exciting current amplitude controlling means.
- 2. An induction motor driving system according to claim 1, further comprising:
- a supply voltage output circuit for providing a supply voltage; and
- a level changer, operatively connected between said supply voltage output circuit and said exciting current amplitude controlling circuit, for receiving and level changing the supply voltage and providing the level changed supply voltage and the rotational speed signal to said exciting current amplitude controlling circuit.
- 3. An induction motor driving system operatively connected to an induction motor generating a rotational speed signal, and operatively connected to receive an exciting current command signal, comprising:
- exciting current amplitude controlling means, operatively connected to the induction motor, for receiving the rotational speed signal and outputting an amplitude signal;
- means, operatively connected to said exciting current amplitude controlling means and the induction motor, for receiving the amplitude signal and increasing tnhe current amplitude of the induction motor in dependence upon the amplitude signal, thereby increasing the rotational speed of the induction motor;
- a supply voltage output circuit providing a supply voltage; and
- a level changer, operatively connected between said supply voltage output circuit and said exciting current amplitude controlling means, for receiving and level changing the supply voltage and providing the level changed supply voltage and the rotational speed signal to said exciting current amplitude controlling means.
- 4. An induction motor driving system according to claim 3, further comprising:
- a supply voltage output circuit for providing a supply voltage; and
- a level changer, operatively connected between said supply voltage output circuit and said exciting current amplitude controlling circuit, for receiving and level changing the supply voltage and providing the level changed supply voltage and the rotational speed signal to said exciting current amplitude controlling circuit.
Priority Claims (1)
Number |
Date |
Country |
Kind |
55-186753 |
Dec 1980 |
JPX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 413,334 filed on Aug. 23, 1982 now abandon.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
55-74377 |
Jun 1980 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
413334 |
Aug 1982 |
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