ELEVATOR BRAKING IN A BATTERY POWERED ELEVATOR SYSTEM
First Claim
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1. An elevator system comprising:
- a battery;
a machine having a motor to impart motion to an elevator car;
an inverter having a plurality of switches to convert DC power from the battery to AC power for the machine in a motoring mode;
a speed sensor coupled to the machine, the speed sensor to generate a speed signal indicative of machine speed; and
a controller to apply braking signals to a group of the switches in a braking mode, the braking signals having a duty cycle in response to the speed signal.
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Abstract
An elevator system includes a battery; a machine having a motor to impart motion to an elevator car; an inverter having a plurality of switches to convert DC power from the battery to AC power for the machine in a motoring mode; a speed sensor coupled to the machine, the speed sensor to generate a speed signal indicative of machine speed; and a controller to apply braking signals to a group of the switches in a braking mode, the braking signals having a duty cycle in response to the speed signal.
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Citations
15 Claims
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1. An elevator system comprising:
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a battery; a machine having a motor to impart motion to an elevator car; an inverter having a plurality of switches to convert DC power from the battery to AC power for the machine in a motoring mode; a speed sensor coupled to the machine, the speed sensor to generate a speed signal indicative of machine speed; and a controller to apply braking signals to a group of the switches in a braking mode, the braking signals having a duty cycle in response to the speed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling an elevator system having a machine that imparts motion to an elevator car and a battery, the method comprising:
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determining if a braking mode has been entered; in braking mode, opening a first group of switches that couple the machine to the battery; detecting a speed signal indicative of speed of the machine; and applying braking signals to a second group of switches that couple the machine to the battery, the braking signals having a duty cycle in response to the speed signal. - View Dependent Claims (11, 12, 13, 14)
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15. A motor control system comprising:
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a battery; a machine having a motor; an inverter having a plurality of switches to convert DC power from the battery to AC power for the machine in a motoring mode; a speed sensor coupled to the machine, the speed sensor to generate a speed signal indicative of machine speed; and a controller to apply braking signals to a group of the switches in a braking mode, the braking signals having a duty cycle in response to the speed signal.
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Specification