Elevator system and associated method including power control for operating an elevator in an emergency mode
First Claim
1. Method for operating an elevator in an emergency mode wherein the elevator comprises a car, a drive motor, a motor drive unit which supplies power to the drive motor and controls the same and an emergency power supply, wherein the motor drive unit has a predetermined normal operation switching frequency, comprising the following steps:
- (a) supplying power from the emergency power supply to cause the drive motor to actively move the car;
(b) placing the motor drive unit in an emergency mode;
(c) determining an actual emergency operation condition characteristic; and
(d) setting the switching frequency of the motor drive unit dependent on the actual emergency operation condition characteristic.
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Accused Products
Abstract
An elevator system and associated method includes power control for operating an elevator (2) in an emergency mode wherein the elevator (2) includes a car (4), a drive motor (10), a motor drive unit (26) which supplies power to the drive motor (10) and controls the same and an emergency power supply (42). The motor drive unit (10) has a predetermined normal operation switching frequency. In an emergency mode, power is supplied to the motor from the emergency power supply (42) while the motor drive unit is in an emergency mode. An actual emergency operation condition characteristic is determined for setting the switching frequency of the motor drive unit (46) dependent on the actual emergency operation condition characteristic.
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Citations
26 Claims
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1. Method for operating an elevator in an emergency mode wherein the elevator comprises a car, a drive motor, a motor drive unit which supplies power to the drive motor and controls the same and an emergency power supply, wherein the motor drive unit has a predetermined normal operation switching frequency, comprising the following steps:
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(a) supplying power from the emergency power supply to cause the drive motor to actively move the car; (b) placing the motor drive unit in an emergency mode; (c) determining an actual emergency operation condition characteristic; and (d) setting the switching frequency of the motor drive unit dependent on the actual emergency operation condition characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for operating an elevator in an emergency mode wherein the elevator comprises a car, a drive motor, a motor drive unit which supplies power to the drive motor and controls the same and an emergency power supply, wherein the motor drive unit has a predetermined normal operation switching frequency, comprising the following steps:
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supplying power from the emergency power supply; bringing the motor drive unit in an emergency mode; determining an actual emergency operation condition characteristic; setting the switching frequency of the motor drive unit dependent on the actual emergency operation condition characteristic; determining a parameter characteristic for the actual condition of the elevator and changing the switching frequency dependent on such parameter; and determining based on the parameter as to whether the car will move due to gravity, and to raise the switching frequency as compared to normal operation switching frequency if the car will move due to gravity. - View Dependent Claims (12, 13, 14)
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15. Elevator comprising a car, a drive motor, a motor drive unit, which is connected to the drive motor and which is adapted to supply power to the drive motor and to control the same, and an emergency power supply, wherein the motor drive unit has a predetermined normal operation switching frequency, and wherein the elevator is, in case of an emergency situation, adapted to
(a) receive power from the emergency power supply to cause the drive motor to actively move the car; -
(b) place the motor drive unit in an emergency mode; (c) determine an actual emergency operation condition characteristic; and (d) setting the switching frequency of the motor drive unit dependent on the actual emergency operation condition characteristic. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. An elevator system comprising a car, a drive motor, a motor drive unit, which is connected to the drive motor and which is adapted to supply power to the drive motor and to control the same, and an emergency power supply, wherein the motor drive unit has a predetermined normal operation switching frequency, and wherein the elevator is, in case of an emergency situation, adapted to
(a) receive power from the emergency power supply; -
(b) bring the motor drive unit in an emergency mode; (c) determine an actual emergency operation condition characteristic; and (d) setting the switching frequency of the motor drive unit dependent on the actual emergency operation condition characteristic, wherein, in case of an emergency mode, the elevator is adapted to determine based on the parameter whether the car will move due to gravity or whether electrical power will have to be fed to the drive motor in order to move the car, and to raise the switching frequency as compared to normal operation switching frequency if the car will move due to gravity and to lower the switching frequency as compared to the normal operation switching frequency if electrical power needs to be fed to the drive motor in order to move the car, respectively. - View Dependent Claims (24, 25, 26)
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Specification