Elevator battery charging control
First Claim
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1. An elevator comprising:
- a battery,a car,a motor powered by the battery for propelling the car,a motor control for controlling motor operation to charge the battery under certain car motion conditions,characterized by;
a power dissipating load,means for sensing the battery voltage and applying a load to the battery for a first interval of time if the voltage exceeds a predetermined level for a second interval of time in repeated succession.
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Abstract
An elevator system is battery powered. The battery is charged by a battery charger and also regenerated by a polyphase motor which drives the car and which is inverter operated. The charge on the battery is controlled by sensing the battery voltage and, if the voltage is excessive for an interval of time, applying a load to the battery for an interval of time. The battery voltage may also be sensed by controlling the battery discharge in proportion to the excess voltage.
39 Citations
4 Claims
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1. An elevator comprising:
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a battery, a car, a motor powered by the battery for propelling the car, a motor control for controlling motor operation to charge the battery under certain car motion conditions, characterized by; a power dissipating load, means for sensing the battery voltage and applying a load to the battery for a first interval of time if the voltage exceeds a predetermined level for a second interval of time in repeated succession. - View Dependent Claims (2, 3, 4)
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Specification