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Position control device

A technology for controlling devices and shaft currents, applied in the direction of controlling electromechanical transmission devices, program control, control systems, etc., can solve problems such as difficulty

Pending Publication Date: 2019-12-31
OKUMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to accurately detect the current direction and precisely switch the dead time compensation value, and there is a limit to reducing DIF ripple through dead time compensation

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0026] First, DIF ripple will be explained with reference to a comparative example. Figure 12 is a circuit diagram illustrating a voltage output unit for one phase of a PWM inverter. By performing on / off high-speed switching control of the transistor Tr1 and the transistor Tr2, the phase voltage V output from the circuit of the direct voltage (Direct Voltage, DC) Vdc can be varied between 0 and Vdc on average. The control voltage command value vo is used to command the on / off of the two transistors, V=Vdc when TR1 is turned on, and V=0 when TR2 is turned on. Diode D1 and Diode D2 are used for backflow.

[0027] Figure 13 The output phase voltage V when the transistor Tr1 and the transistor Tr2 are switched by a certain control voltage command value vo is shown. Figure 13 The upper side of is an example of the control voltage command value vo. The dead time Td is a pause time used to prevent two transistors from being turned on at the same time and causing a short circui...

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Abstract

A position control device 10 includes a subtracter 63 for subtracting a q-axis current detection value iq from a q-axis current command value iq* to output a q-axis current error [delta]iq; an adder 13 for adding a q-axis current compensation amount iqc* for compensating for response timing of q-axis current to the q-axis current error [delta]iq; a q-axis current controller 11 for amplifying an output of the adder 13 by I-P control to calculate a q-axis voltage error [delta]vq and calculating a q-axis voltage command value vq* on the basis of the q-axis voltage error [delta]vq; and a second adder 12 for adding a q-axis voltage feedforward amount vqf corresponding to a time derivative value s*iq of the q-axis current to the q-axis voltage command value vq* to calculate a final q-axis voltage command value.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Patent Application No. 2018-119061 filed on June 22, 2018, the entire contents of which, including specification, claims, drawings and abstract, are hereby incorporated by reference. technical field [0003] The present invention discloses a position control device, which controls the current of a motor (for example, a synchronous motor or an induction motor), thereby controlling the speed or rotation angle (position) of a feed shaft or a spindle and adopts pulse width modulation (Pulse -Width Modulation, PWM) inverter as a power converter. Background technique [0004] A position control device that controls the speed or rotation angle (position) of a feed axis or a spindle of a CNC machine tool usually controls a three-phase synchronous motor or an induction motor (hereinafter also referred to as a motor) to drive a load (for example, a table connected to the motor or w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P27/08
CPCH02P21/18H02P27/08H02P21/22H02P6/10H02P21/09G05B2219/37298G05B19/19H02P27/12
Inventor 江口悟司
Owner OKUMA CORP