Elevator motor drive tolerant of an irregular power source
First Claim
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1. A system for continuously driving a hoist motor for an elevator from an irregular power supply, the system comprising:
- a regenerative drive for delivering power between the power supply and the hoist motor; and
a controller operable to measure a power supply voltage in response to a detected change in the power supply voltage and to control the regenerative drive to adjust a nominal motion profile of the elevator in proportion with an adjustment ratio of the measured power supply voltage to a normal power supply voltage.
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Abstract
A hoist motor (12) for an elevator (14) is continuously driven from an irregular power supply (16). A regenerative drive (10) delivers power between the power supply (16) and the hoist motor (12). A controller (11) measures a power supply voltage in response to a detected change in the power supply voltage and controls the regenerative drive (10) to adjust a nominal motion profile of the elevator (14) in proportion with an adjustment ratio of the measured power supply voltage to a normal power supply voltage.
38 Citations
20 Claims
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1. A system for continuously driving a hoist motor for an elevator from an irregular power supply, the system comprising:
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a regenerative drive for delivering power between the power supply and the hoist motor; and a controller operable to measure a power supply voltage in response to a detected change in the power supply voltage and to control the regenerative drive to adjust a nominal motion profile of the elevator in proportion with an adjustment ratio of the measured power supply voltage to a normal power supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for continuously driving a hoist motor for an elevator from an irregular power supply comprising:
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measuring a power supply voltage in response to a change in the power supply voltage; adjusting a nominal motion profile of the elevator in proportion with an adjustment ratio of the measured power supply voltage to a normal power supply voltage to produce a new motion profile, wherein the nominal motion profile comprises at least one of maximum acceleration, maximum steady state speed, and maximum deceleration of the elevator when the power supply voltage is normal; and driving the elevator hoist motor with a drive current based on the new motion profile. - View Dependent Claims (11, 12, 13)
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14. A system for controlling a regenerative drive including a converter and inverter connected by a direct current (DC) bus, the inverter connected to an elevator hoist motor and the inverter connected to an alternating current (AC) power supply via line reactors, the system comprising:
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a voltage sensor for detecting a change in a power supply voltage and measuring the power supply voltage; an elevator motion profile generator which, in response to a change in the power supply voltage, generates a new motion profile that is a nominal motion profile proportionally adjusted by an adjustment ratio of the measured power supply voltage to a normal power supply voltage; an error correction device that receives the new motion profile and actual operating parameters of the hoist motor and produces an error signal related to a difference between the actual operating parameters and target operating parameters based on the new motion profile; and an inverter controller that receives the error signal and controls the inverter to drive the hoist motor to the target operating parameters. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification