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Controller of spindle provided with encoder

A control device and encoder technology, which is applied to automatic control devices, driving devices, feeding devices, etc., can solve problems such as large shocks and drastic changes in torque commands, and achieve the effect of avoiding vibration and overcurrent.

Active Publication Date: 2014-07-23
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, when the speed (rotational speed) of the encoder attached to the spindle is used for the speed control of the motor (refer to Figure 16 ) or current control (refer to Figure 17 ), the torque command may change dramatically, a large shock may occur, and the current phase control cannot be accurately performed, resulting in overcurrent, etc. (refer to Figure 19 )Call the police

Method used

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  • Controller of spindle provided with encoder
  • Controller of spindle provided with encoder
  • Controller of spindle provided with encoder

Examples

Experimental program
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Embodiment Construction

[0041] refer to figure 1 A first embodiment of the spindle control device of the present invention will be described.

[0042] The induction motor 2 does not have a sensor for detecting the speed, that is, it is a sensorless induction motor. The driving force of the induction motor 2 is transmitted to a main shaft 6 of a lathe or the like via a reduction mechanism 4 including a belt 5 and gears (not shown). An encoder 8 that outputs a feedback pulse Pfb for detecting the rotational position of the main shaft is attached to the main shaft 6 . The feedback pulse Pfb output from the encoder 8 is used to manage the rotational position of the main shaft, and realize functions such as a main shaft positioning stop function.

[0043] The speed control unit 11 performs PI control (proportional-integral control) using the speed command Vcmd output from a host control device (not shown) and the estimated speed Vest1 of the sensorless induction motor 2 estimated by the motor speed est...

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Abstract

The invention relates to a spindle control device with an encoder. The spindle control device of the present invention controls the spindle connected to the induction motor via a belt by controlling the rotational speed of the induction motor. An encoder for detecting the position of the main shaft is attached to the main shaft, but a speed detector is not attached to the induction motor. The speed of the induction motor is estimated from the spindle speed obtained by the encoder output, and belt slippage is detected based on the estimated speed of the induction motor. Then, when belt slippage is detected, the estimated speed of the induction motor is not used in the control of the induction motor.

Description

technical field [0001] The present invention relates to a control device for controlling the spindle of a machine tool or the like driven by an induction motor via a belt by controlling the rotational speed of the induction motor, and particularly relates to a speed detector not mounted on the induction motor but a device for detecting the spindle installed on the spindle A spindle control device such as a position encoder that can control the spindle. Background technique [0002] Figure 15 It is a schematic block diagram illustrating an application to a main shaft of an induction motor that does not have a sensor for detecting speed (sensorless). [0003] A sensorless induction motor 2 transmits its driving force to a spindle 6 of a lathe or the like via a reduction mechanism 4 including a belt. An encoder 8 that outputs a feedback pulse Pfb for detecting the rotational position of the main shaft 6 is attached to the main shaft 6 . Then, the feedback pulse Pfb output fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q5/10B23Q15/00B23Q17/00G05B19/18G05B19/416
CPCB23Q17/10G05B2219/41319G05B19/404G05D13/64G05B2219/41136G05B2219/49254
Inventor 岩下平辅置田肇秋山隆洋李耕
Owner FANUC LTD
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