Control apparatus for A.C. elevator
First Claim
1. A control apparatus for an A.C. elevator having a drive motor to move a cage and a brake wherein a braking force is generated by deenergizing a brake coil to restrain the cage, while the braking force is released by energizing the brake coil in response to a start command signal;
- said control apparatus comprising;
a current control circuit havinga current command generator which generates a command for current supplied to said brake coil, which compares the current command with a current value detecteda current detector which detects the brake coil current and produces a signal used by said current control circuit to operate said current command generator and to control the brake coil current, anda velocity control circuit which produces a velocity command to control torque generated by the drive motor in accordance with the load in the cage.
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Accused Products
Abstract
In a control apparatus for A.C. elevator, this invention consists in comprising a current control circuit which compares a current command of a brake coil current generated by a current command generator and an actual current thereof detected by a current detector, so as to control the brake coil current, whereby a riding quality of a cage is improved. This invention further comprises a velocity control circuit which adds a bias corresponding to a load in the cage, to a reference velocity command for the cage generated by a velocity command generator, whereby the riding quality of the cage is improved still further.
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2 Claims
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1. A control apparatus for an A.C. elevator having a drive motor to move a cage and a brake wherein a braking force is generated by deenergizing a brake coil to restrain the cage, while the braking force is released by energizing the brake coil in response to a start command signal;
- said control apparatus comprising;
a current control circuit having a current command generator which generates a command for current supplied to said brake coil, which compares the current command with a current value detected a current detector which detects the brake coil current and produces a signal used by said current control circuit to operate said current command generator and to control the brake coil current, and a velocity control circuit which produces a velocity command to control torque generated by the drive motor in accordance with the load in the cage. - View Dependent Claims (2)
- said control apparatus comprising;
Specification