Controller of elevator
First Claim
1. A controller of an elevator comprising:
- a converter for rectifying AC power from an AC power source and converting the AC power to DC power;
an inverter for converting the DC power to AC power of a variable voltage and a variable frequency and driving an electric motor and operating the elevator;
a power accumulating device arranged between DC buses between said converter and said inverter, and accumulating DC power from the DC buses at a regenerative operation time of the elevator and supplying the DC power accumulated on the DC buses at a power running operation time;
charging-discharging control means for controlling charging and discharging operations of said power accumulating device with respect to said DC buses;
bus voltage measuring means for measuring a bus voltage of each of said DC buses; and
charging-discharging state measuring means for measuring charging and discharging states of said power accumulating device;
said charging-discharging control means controlling the charging and discharging operations of said power accumulating device according to a measuring value from said bus voltage measuring means and a measuring value from said charging-discharging state measuring means.
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Accused Products
Abstract
This invention provides a controller of an elevator for stably controlling charging and discharging operations of a power accumulating device by using a cheap secondary battery of a low capacity, without damaging energy saving effects obtained by charging. Therefore, the controller of the elevator comprises a converter 2 for rectifying AC power and converting the AC power to DC power; an inverter 4 for converting the DC power to AC power of a variable voltage and a variable frequency to operate the elevator; a power accumulating device 11 for accumulating DC power from a DC bus 3 at a regenerative operation time of the elevator and supplying the DC power accumulated on the DC bus at a power running operation time; a charging-discharging control circuit 15 for controlling charging and discharging operations of the power accumulating device; a series connecting body, arranged between DC buses, and constructed by a gate 16 for regenerative current control and a regenerative resistor 17; a regenerative control circuit 19A for controlling an operation of the gate for regenerative current control; and a charging-discharging state measuring device 14A for measuring charging and discharging states of the power accumulating device. The charging-discharging control circuit 15A controls the charging and discharging operations of the power accumulating device in accordance with a measuring value of a bus voltage and a measuring value of the charging and discharging states.
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Citations
11 Claims
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1. A controller of an elevator comprising:
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a converter for rectifying AC power from an AC power source and converting the AC power to DC power;
an inverter for converting the DC power to AC power of a variable voltage and a variable frequency and driving an electric motor and operating the elevator;
a power accumulating device arranged between DC buses between said converter and said inverter, and accumulating DC power from the DC buses at a regenerative operation time of the elevator and supplying the DC power accumulated on the DC buses at a power running operation time;
charging-discharging control means for controlling charging and discharging operations of said power accumulating device with respect to said DC buses;
bus voltage measuring means for measuring a bus voltage of each of said DC buses; and
charging-discharging state measuring means for measuring charging and discharging states of said power accumulating device;
said charging-discharging control means controlling the charging and discharging operations of said power accumulating device according to a measuring value from said bus voltage measuring means and a measuring value from said charging-discharging state measuring means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification