Elevator control device

• US 20010013447A1
• Filed: 02/12/2001
• Published: 08/16/2001
• Est. Priority Date: 02/15/2000
• Status: Active Grant

• Current Assignee: Korea Electric Power Corporation (Government of South Korea), Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Korea Electric Power Corporation (Government of South Korea), Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kobayashi, Kazuyuki, Araki, Hiroshi, Suga, Ikuro, Tajima, Shinobu
• Granted Patent: US 6,435,311 B2
• Time in Patent Office: Days
• US Class Current: 187/296
• CPC Class Codes: B66B 1/30 effective on driving gear , e.g. acting on power electronics, on inverter or rectifier controlled motor

Abstract

An elevator control device includes: a convertor which rectifies an a.c. power and converts the a.c. power into a d.c. power; an inverter which converts the d.c. power into an a.c. power having a variable voltage and a variable frequency; an electric motor which is driven by the a.c. power having a variable voltage and a variable frequency to drive an elevator; a power storing unit which is charged with an electric power; a required-power arithmetically operating circuit which calculates a required power of the elevator which is an electric power required for the operation of the elevator or an electric power caused by the operation of the elevator; and a charging/discharging control circuit which controls the charging operation or the discharging operation of the power storing unit based on the required power of the elevator.

Claims

1. An elevator control device, comprising:

a convertor which rectifies an a.c. power and converts the a.c. power into a d.c. power;

an inverter which converts the d.c. power into an a.c. power having a variable voltage and a variable frequency;

an electric motor which is driven by the a.c. power having a variable voltage and a variable frequency to drive an elevator;

a power storing unit which is charged with an electric power;

a required-power arithmetically operating circuit which calculates a required power of the elevator which is an electric power required for the operation of the elevator or an electric power caused by the operation of the elevator; and

a charging/discharging control circuit which controls the charging operation or the discharging operation of said power storing unit based on the required power of the elevator.

2. The elevator control device as claimed in

claim 1

, wherein said required-power arithmetically operating circuit calculates the required power of the elevator and outputs an obtained required-power value to said charging/discharging control circuit through communication means.

3. The elevator control device as claimed in

claim 1

, wherein said charging/discharging control circuit controls so that the electric power is charged in said power storing unit when a required power of the elevator is a negative value and an electric power occurs due to the operation of the elevator, and the electric power is discharged from said power storing unit when a required power of the elevator is a positive value and the electric power is required for the operation of the elevator.

4. The elevator control device as claimed in

claim 1

, wherein said charging/discharging control circuit controls so that the electric power is charged in said power storing unit from the commercial power supply when the required power of the elevator is 0 and the elevator stops.

5. The elevator control device as claimed in

claim 1

, further comprising a charging/discharging circuit which conducts the charging operation or the discharging operation of said power storing unit under the control of said charging/discharging control circuit;

wherein said charging/discharging control circuit controls so that the electric power discharged from said power storing unit on the basis of the required power of the elevator when the electric power of the elevator is a positive value and the electric power is required for the operation of the elevator, and controls so that an output voltage from said charging/discharging circuit to said power storing unit to a given voltage when the required power of the elevator is a negative value and the electric power occurs due to the operation of the elevator.

6. The elevator control device as claimed in

claim 5

, wherein the output voltage controlled to the given voltage which is outputted from said charging/discharging circuit is set to be higher than the voltage value obtained by rectifying the supply voltage.

7. The elevator control device as claimed in

claim 1

, wherein said charging/discharging control circuit controls so that the electric power is discharged from the power storing unit by an excessive electric power amount which exceeds a given electric power amount on the basis of the required power of the elevator.

8. The elevator control device as claimed in

claim 1

, wherein said charging/discharging control circuit controls the electric power amount discharged from said power storing unit on the basis of a predetermined time zone.

9. The elevator control device as claimed in

claim 1

, wherein said charging/discharging control circuit switches between a case in which only an excessive electric power amount which exceeds the predetermined electric power amount with respect to the required power of the elevator is discharged from said power storing unit, and a case in which the given electric power amount is stably discharged from said power storing unit.

10. The elevator control device as claimed in

claim 1

, wherein said required-power arithmetically operating circuit calculates the required power of the elevator on the basis of a voltage command value for applying the voltage to the electric power and an electric motor current or a current command value for supplying a current to the electric motor.