Servo control device

• US 7,541,763 B2
• Filed: 11/14/2005
• Issued: 06/02/2009
• Est. Priority Date: 05/28/2002
• Status: Expired due to Fees

• Current Assignee: Toshiba Kikai Kabushiki Kaisha
• Original Assignee: Toshiba Kikai Kabushiki Kaisha
• Inventors: Iida, Takeshi, Kobayashi, Naomi, Ito, Takamichi, Aono, Ryuji
• Primary Examiner(s): Duda; Rina I
• Application Number:
  US11/271,969
• Publication Number:
  US 20060061318A1
• Time in Patent Office: 1,296 Days
• Field of Search: 318560-650, 318700-800, 318/432, 318/434
• US Class Current: 318/560
• CPC Class Codes: B29C 45/76 Measuring, controlling or regulating measuring in general G01; controlling or regulating in general G05
• CPC Class Codes: H02P 5/74 controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence

Abstract

A servo control device includes a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled; a first detector for detecting at least the drive current value; and a logical arithmetic section which introduces a current command determining the drive current for controlling the drive speed of the drive unit to move the target to be controlled to a predetermined position, and which introduces the drive current value fed back from the first detector. The logical arithmetic section outputs the current command to the current supply unit after correcting the current command by a digital logic process on the basis of the drive current value.

Claims

1. A servo control device comprising:

a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled;

a first detector for detecting at least the drive current value; and

a logical arithmetic section which introduces a current command determining the drive current for controlling the drive speed of the drive unit to move the target to be controlled to a predetermined position, and which introduces the drive current value fed back from the first detector, said logical arithmetic section outputting the current command to the current supply unit after converting the current command by a digital logic process on the basis of the drive current value by using a custom large-scale integrated circuit,

wherein the logical arithmetic unit includes;

an input register which introduces and holds the current command;

a feedback register which introduces and holds the drive current fed back from the first detector; and

a current control arithmetical unit for correcting the current command with reference to the current command from the input register and the drive current value from the feedback register.

2. A servo control device comprising:

a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled;

a first detector for detecting at least the drive current value;

a logical arithmetic section which introduces a current command determining the drive current for controlling the drive speed of the drive unit to move the target to be controlled to a predetermined position, and which introduces the drive current value fed back from the first detector, said logical arithmetic section outputting the current command to the current supply unit after converting the current command by a digital logic process on the basis of the drive current value by using a custom large-scale integrated circuit; and

a position controller for outputting a speed command and an electrical angle based on the position of the drive unit, and a second detector for detecting the position of the drive unit,

wherein the logical arithmetic section includes;

an input register which introduces an electrical angle and the current command, the electrical angle is calculated by the position controller from the position of the drive unit fed back from the second detector;

a feedback register which introduces the drive current value fed back from the first detector; and

a current control arithmetical unit for correcting the current command with reference to the drive current value and the electrical angle.