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| Motor with reduced clogging torque incorporating stator salient poles and rotor magnetic poles |
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| Electric power steering control with torque ripple and road disturbance damper |
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| Electric motor and electric power steering apparatus employing the electric motor |
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| Motor |
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| Permanent magnet motor |
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| Interior permanent magnet synchronous motor |
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Servo control system
| Details |
Inventors: Uehara, Shinichiro; Ichikawa, Wataru; Takei, Manabu;
Assignee: Kabushiki Kaisha SG (Tokyo, JP)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Martin; David
Attorney, Agent or Firm: Graham & James
There are provided a position and velocity control system for producing a velocity command signal in response to a position command signal and a signal representing a current position and velocity of a servo motor, a current control system for supplying a drive current to the servo motor in response to the velocity command signal, and a communication system for transmitting data between the two systems by means of a bilateral communication line. A servo control system is thereby separated between the current control system and the position and velocity control system and connected to each other through the communication system. This separation through the communication system is advantageous for protecting the position and velocity control system from influence of noise generated in the current control system and also brings about benefits such as expansion of the controllability owing to the bilateral communication, sharing of a single current control system by plural servo motors by switching connection of the servo motors and controllability of plural pairs of servo motor and current control system by a single position and velocity control system by a multi-point connection. |
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DETAILED DESCRIPTION It is, therefore, an object of the invention to provide a servo control system capable of separating a control system effectively and suitably at a suitable place in the servo control system.
The servo control system according to the invention comprises a servo motor, a current control section responsive to a velocity command signal for supplying a drive current to the servo motor, a position and velocity control section responsive to a position command signal and a signal representing a current position and velocity of the servo motor for supplying the velocity command signal to the current control section, and communication means provided between the current control section and the position control section for transmitting data between the current control section and the position and velocity control section by means of a bilateral communication line.
Since there is provided the communication means between the current control section and the position control section, the current control section and the position control section are separated from each other and connected to each other by means of the communication means.
Accordingly, the current control section which controls a high voltage current can be disposed near the servo motor while the position and velocity control section having a position and velocity control system can be disposed with a certain distance to the servo motor, so that the position and velocity control section is not subject to noise generated by the current control section.
Since data transmission between the current control section and the position and velocity control section is performed through the bilateral communication line, control parameters for the current control section and other data can be read by a high order controller through the communication line.
When, accordingly, the capacity of the servo motor has been changed, a servo motor of any rated data can be adapted for use simply by reading control parameters for the current control section and other data by the high order controller and modifying the data in accordance with the rated data of the servo motor
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Generators or Motors 
