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Method and apparatus for stability control of open loop motor drive operation

A technology of motor drive and speed control, which is applied in the direction of AC motor control, estimation/correction of motor parameters, control system, etc., and can solve problems such as instability of driven motors

Active Publication Date: 2017-04-12
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in some cases the driven motor may not be able to start successfully from a standstill due to oscillations of unstable motor speeds

Method used

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  • Method and apparatus for stability control of open loop motor drive operation
  • Method and apparatus for stability control of open loop motor drive operation
  • Method and apparatus for stability control of open loop motor drive operation

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Embodiment Construction

[0028] Referring now to the drawings, hereinafter several embodiments or implementations are described in conjunction with the drawings, wherein like numerals are used to refer to like elements throughout, and wherein the various features are not necessarily drawn to scale.

[0029] Reference is made to US Patent Application Serial No. 13 / 868,216, entitled "Position Sensorless Open Loop Control for Motor Drives with Output Filter and Transformer," filed April 23, 2013, the entire contents of which are incorporated herein by reference. Reference is also made to US Patent Application Serial No. 13 / 931,839, entitled "METHOD ANDAPPARATUS FOR STABILITY CONTROL OF OPEN LOOP MOTOR DRIVE OPERATION," filed June 29, 2013, the entire contents of which are incorporated herein by reference.

[0030] The method 100 and motor drive apparatus 10 for sensorless or open loop motor speed control using a stability signal generator as part of a motor drive controller are described below. Control t...

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PUM

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Abstract

The present invention relates to methods and apparatus for stability control of open loop motor drive operations. The present invention discloses a motor driver (10) and control method (100) for sensorless motor speed control, wherein the output current (ia, ib, ic) of the inverter is sampled from the inverter output terminal, and based on the current Feedback and one or more voltage commands (V*a, V*b, V*c) or one or more voltage feedback signals (Va, Vb, Vc) to determine a frequency modulation value (25a). The speed or frequency setpoint (21, 31) is adjusted at least in part based on the frequency modulation value (25a) to provide an adjusted frequency or speed setpoint value (31a), which is then used to control (110) the inverter ( 14) to provide stability control, thereby mitigating wobble or motor shutdown.

Description

technical field [0001] The subject matter disclosed herein relates to power conversion, and more particularly, to devices and techniques for sensorless motor control. Background technique [0002] Sensorless motor drives are used in a variety of applications, especially where it is difficult or impractical to provide position and / or speed sensors directly at the motor load. Typical sensorless systems employ a voltage-frequency (V / F, or volts per hertz, V / Hz) controller that provides a voltage setpoint based on desired motor speed or frequency, and this form of sensorless control has Mainly used with induction motors. In some applications, a step-up transformer can be used to boost the motor drive output voltage to allow the use of low voltage drives to power medium voltage induction motors, and / or to reduce I2R losses and facilitate use in both motor drives and driven motors Run long cables between smaller diameter cable wires. Some applications also employ sine-wave filt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02P27/08H02P23/14
CPCH02P21/00
Inventor 刘晶波托马斯·诺德哈尔彼得·舒米特谢苗·罗亚克蒂莫西·M·罗恩
Owner ROCKWELL AUTOMATION TECH