Elevator speed control apparatus

• US 4,124,101 A
• Filed: 10/29/1976
• Issued: 11/07/1978
• Est. Priority Date: 10/29/1975
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Satoh, Tsuyoshi
• Primary Examiner(s): Schaefer, Robert K.
• Assistant Examiner(s): Duncanson, Jr., W. E.
• Application Number:
  US05/736,818
• Time in Patent Office: 739 Days
• Field of Search: 187/29
• US Class Current: 187/293
• CPC Class Codes: B66B 1/285 with the use of a speed pattern generator

Abstract

An elevator speed control apparatus is disclosed comprising: an ideal velocity generator for generating a velocity ideal for the cage to travel the distance to a floor the cage is to land; a velocity detector for detecting the velocity of the cage in motion; a comparator for comparing the actual cage velocity data supplied from the velocity detector with the ideal velocity data supplied from the ideal velocity generator; an acceleration setting device for setting an acceleration for the cage; an acceleration modifying device operated by the output of the comparator, for modifying the acceleration data supplied from the acceleration modifying device; a command velocity pattern generator for integrating with time the acceleration data supplied from the acceleration modifying device and thus generating a command velocity pattern; and a motor driving device for controlling the cage hoist driving motor according to the command velocity pattern; wherein an ideal cage velocity is maintained by modifying the acceleration data according to the output of the comparator.

Claims

1. An elevator speed control apparatus comprising:

an ideal velocity generator for generating a velocity ideal for the cage to travel the distance to a floor the cage is to land;

a velocity detector for detecting the velocity of the cage in motion;

a comparator for comparing the actual cage velocity data supplied from the velocity detector with the ideal velocity data supplied from the ideal velocity generator;

an acceleration setting device for setting an acceleration for the cage;

an acceleration modifying device operated by the output of the comparator, for modifying the acceleration data supplied from the acceleration setting device;

a command velocity pattern generator for integrating with time the acceleration data supplied from the acceleration modifying device and thus generating a command velocity pattern; and

a motor driving device for controlling the cage hoist driving motor according to the command velocity pattern;

wherein an ideal cage velocity is maintained by modifying the acceleration data according to the output of the comparator.

2. The elevator speed control apparatus according to claim 1 wherein said velocity detector detects an actual cage velocity according to the distance traveled by the cage for a given period of time.

3. The elevator speed control apparatus according to claim 1 wherein said acceleration setting device sets an acceleration for the cage according to an acceleration selection signal supplied from a position computer which selects an acceleration for the cage according to a call generated.

4. The elevator speed control apparatus according to claim 1 further comprising:

a position-velocity converter for generating a velocity pattern corresponding to a position immediately before stopping of the cage; and

an automatic gain adjusting device supplied with the output of the position-velocity converter;

wherein said gain adjusting device is used whereby the output of the position-velocity converter is automatically caused to match with the level of a command velocity pattern at switching from the output of said command velocity pattern generator to the output of said position-velocity converter.