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Powe conversion system and METHOD FOR OVERVOLTAGE PROTECTION AND REVERSE MOTOR SPEED CONTROL

A power conversion system and motor technology, applied in the direction of motor control, AC motor control, output power conversion device, etc.

Active Publication Date: 2014-12-24
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the reverse rotation of the pump motor allows the fluid to flow back down the well so that when power is restored later, the pumping done prior to the loss of power must be redone

Method used

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  • Powe conversion system and METHOD FOR OVERVOLTAGE PROTECTION AND REVERSE MOTOR SPEED CONTROL
  • Powe conversion system and METHOD FOR OVERVOLTAGE PROTECTION AND REVERSE MOTOR SPEED CONTROL
  • Powe conversion system and METHOD FOR OVERVOLTAGE PROTECTION AND REVERSE MOTOR SPEED CONTROL

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Embodiment Construction

[0013] Referring now to the drawings, several embodiments or examples are described below in conjunction with the drawings, wherein like reference numerals are used to represent like elements throughout and wherein the various features are not necessarily drawn to scale.

[0014] figure 1 An exemplary power system 2 is shown comprising an AC input source 4 and a motor drive 10 having an AC output 11 powered through an optional transformer 8 to drive a motor load 6 . The motor drive 10 includes a rectifier 12, which may be an active (e.g., switching) rectifier and / or may be a passive rectifier having one or more switches and / or diodes, which receives three-phase AC input power from the source 4 , and provides the DC bus voltage to the DC bus circuit 14 for use by the output inverter 20 . The DC bus circuit 14 includes a DC capacitor C, which may be a plurality of capacitors or a single capacitor assembly connected in any suitable series, parallel, and / or series / parallel config...

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PUM

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Abstract

Apparatus and methods are presented for mitigating overvoltages and limiting reverse motor speeds for motor drive power loss events, in which a first power dissipation circuit is enabled at the motor drive output to limit reverse rotation of a driven motor load when motor drive power is lost, and a second power dissipation circuit in a DC bus circuit is used to mitigate over voltages following restoration of motor drive power.

Description

technical field [0001] The present disclosure relates generally to power control techniques, and more particularly to methods and power conversion systems for mitigating motor drive overvoltage and limiting reverse rotation of motor loads for motor drive power loss events. Background technique [0002] A motor drive is a power conversion system for supplying power to a motor being driven by converting received input power. And motor loads can be used in a variety of different applications. In submersible well pumps, the driven pump motor is used to drive a screw or centrifugal pump that typically extracts fluid from the well. During normal operation, the pump motor rotates forward to draw fluid up the well tubing. If the associated motor drive loses power, the pump motor will stop turning and previously pumped fluid will begin to flow down back into the well, causing the pump motor's rotor to rotate in reverse. If the motor is constructed with permanent magnets, the rever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02H7/09H02H7/097
CPCH02M1/32H02M5/458H02M7/5387H02P29/025H02P29/0241H02P3/22H02P29/024
Inventor 罗伯特·J·布雷茨曼谢苗·罗亚克约翰·M·卡苏尼希
Owner ROCKWELL AUTOMATION TECH