Elevator car speed control in a battery powered elevator system
First Claim
1. An elevator system comprising:
- a battery;
a machine having a motor for imparting motion to an elevator car;
an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and
a controller to control the inverter, the controller implementing at least one of;
detecting an overload at the battery in motoring mode and reducing car speed in response to the overload;
detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge;
detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and
detecting car load and adjusting car speed in response to car load and car direction of travel.
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Accused Products
Abstract
An elevator system includes a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of: detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load.
27 Citations
17 Claims
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1. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load and car direction of travel. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 17)
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2. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load; wherein; detecting the overload at the battery in motoring mode and reducing car speed in response to the overload includes; detecting a voltage at the battery and reducing car speed if the voltage at the battery is below a threshold.
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3. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load; wherein; detecting the overload at the battery in motoring mode and reducing car speed in response to the overload includes; detecting a voltage at the battery and controlling car speed in response to a function relating battery voltage and car speed.
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4. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load; wherein; detecting the overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge includes; detecting a voltage at the battery and reducing car speed if the voltage at the battery exceeds a threshold.
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5. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load; wherein; detecting the overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge includes; detecting a voltage at the battery and controlling car speed in response to a function relating battery voltage and car speed.
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15. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load; wherein; the controller implements at least two of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; and detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current.
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16. An elevator system comprising:
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a battery; a machine having a motor for imparting motion to an elevator car; an inverter for converting DC power from the battery to AC power for the machine in motoring mode and converting AC power from the machine to DC power for the battery in regenerative mode; and a controller to control the inverter, the controller implementing at least one of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current; and detecting car load and adjusting car speed in response to car load; wherein; the controller implements each of; detecting an overload at the battery in motoring mode and reducing car speed in response to the overload; detecting an overcharge at the battery in regenerative mode and reducing car speed in response to the overcharge; and detecting motor direct current in a motor field weakening mode and reducing car speed in response to the motor direct current.
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Specification