US 6,252,367 B1Granted

Servo controller

AssigneeFanuc Corporation

InventorsKeiji Sakamoto, Yukio Toyosawa, Kenji Takahashi

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Abstract

A servo controller capable of controlling motors to be driven in different control modes, such as a synchronous motor and an induction motor, irrespectively of the type of the motor, and also capable of carrying out servo control by using incremental feedback signals. A control section common to individual motors and a control section dedicated to each motor are provided in a servo controller. The common control section is always used, while the dedicated control section is selectively used in accordance with the motor to be driven. Thereby, motors each requiring a different control mode can be controlled by the servo controller of one type. The use of th servo controller of one type can reduce maintenance management and a load on a CNC. Also, the provision of the control section common to individual motors can restrain increases of size, installation area and manufacturing cost of the device.

Claims8

Dependent claims

A servo controller comprising:

a common control section for performing control common to an induction motor and an synchronous motor, said common control section including a position controller, a velocity controller and a current controller;
a first dedicated control section for performing control dedicated to the induction motor, and a second dedicated control section for performing control dedicated to the synchronous motor, said first dedicated control section including a d-axis current command generator for calculating magnetic flux and magnetic flux current, and a slip command generator to generate a slip command for the induction motor, said second dedicated control section including a d-axis current command generator to set a d-axis current command for the synchronous motor;
a position/velocity detecting section for detecting position/velocity of a motor to be driven based on signals from a sensor associated with the motor;
and
a selecting section for selecting one of said first dedicated control section and said second dedicated control section, and driving parameter for the motor to be driven, based on attribution data preset for each motor,
thereby controlling the motor to be driven by a combination of said common control section, the selected dedicated control section and said position/velocity detecting section.

3 more elements

Dependencies are inferred from the claim text.