Failure detector for regeneration power absorbing means
First Claim
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1. A power supply control system for an electric motor comprising:
- a direct current power source means for supplying direct current power;
an inverter means operative for receiving said direct current power from said direct current source means for applying alternating current driving power to said electric motor for driving the latter in a controlled driving direction in a first mode, and for outputting to said direct current power source a regenerated power from said electric motor in a second mode;
a regenerated power absorbing means, interposed between said direct current power source means and said inverter means, for absorbing said regenerated energy from said inverter means;
an abnormality detector means, associated with said regenerated power absorbing means, for monitoring operating condition of the latter to produce an abnormal condition indicative signal when abnormality of said regenerated power absorbing means is detected; and
a control means, associated with said inverter means for controlling operation of the latter to drive said electric motor in a desired direction at a controlled speed, said control means being responsive to said abnormal condition indicative signal of said abnormality detector means for performing a predetermined fail-safe operation to control operation of said inverter means in fail-safe mode.
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Abstract
A control system for an electric motor includes a detector associated with a regenerated power absorbing circuit for monitoring operation of the regenerated power absorbing circuit for detecting an abnormal condition thereof. The control circuit is responsive to detection of abnormality in the regenerated power absorbing circuit for controlling operation of an inverter in a fail-safe mode.
41 Citations
23 Claims
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1. A power supply control system for an electric motor comprising:
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a direct current power source means for supplying direct current power; an inverter means operative for receiving said direct current power from said direct current source means for applying alternating current driving power to said electric motor for driving the latter in a controlled driving direction in a first mode, and for outputting to said direct current power source a regenerated power from said electric motor in a second mode; a regenerated power absorbing means, interposed between said direct current power source means and said inverter means, for absorbing said regenerated energy from said inverter means; an abnormality detector means, associated with said regenerated power absorbing means, for monitoring operating condition of the latter to produce an abnormal condition indicative signal when abnormality of said regenerated power absorbing means is detected; and a control means, associated with said inverter means for controlling operation of the latter to drive said electric motor in a desired direction at a controlled speed, said control means being responsive to said abnormal condition indicative signal of said abnormality detector means for performing a predetermined fail-safe operation to control operation of said inverter means in fail-safe mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A failure detector in a power supply control system for an induction motor, said power supply system comprising a direct current power source means for supplying direct current power, an inverter means operative for receiving said direct current power from said direct current source means and for applying alternating current driving power to said electric motor for driving the latter in a controlled driving direction, and for outputting a regenerated power from said electric motor to said direct current power source, a regenerated power absorbing means, interposed between said direct current power source means and said inverter means, for absorbing said regenerated energy from said inverter means, and a control means, associated with said inverter means for controlling operation of the latter to drive said electric motor in a desired direction at a controlled speed, wherein said failure detector comprising:
an abnormality detector means, associated with said regenerated power absorbing means, for monitoring variation of said potential in said regenerated power absorbing circuit for detecting abnormality of the latter based on the frequency of variation of the potential in relation to a predetermined frequency. - View Dependent Claims (12, 13, 14, 15)
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16. A fail-safe system for a power supply system of an elevator hoisting motor which drives an elevator cage up and down with stops at one or more predetermined elevational positions for allowing passengers to enter into and exit from said elevator cage, comprising:
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a direct current power source means for supplying a direct current power, which includes an alternating current power source and a converter receiving alternating current from said alternating current power source and converting it to a direct current power; an inverter means operative for receiving said direct current power from said direct current source means and applying alternating current driving power to said electric motor for driving the latter in a controlled driving direction, and for outputting regenerated power from said electric motorto said direct current power source; a regenerated power absorbing means, interposed between said direct current power source means and said inverter means, for absorbing said regenerated energy from said inverter means; an abnormality detector means, associated with said regenerated power absorbing means, for monitoring operating condition of the latter to produce an abnormal condition indicative signal when abnormality of said regenerated power absorbing means is detected; and a control means, associated with said inverter means for controlling operation of the latter to drive said electric motor in a desired direction at a controlled speed, said control means being responsive to said abnormal condition indicative signal of said abnormality detector means for performing a predetermined fail-safe operation to control operation of said inverter means in fail-safe mode for driving said cage to one of said predetermined elevational positions. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification