Unlock instant, AI-driven research and patent intelligence for your innovation.

System and method for individual phase motor over voltage protection

A technology for electric motors and electric motors, applied in starters of single polyphase induction motors, AC motor control, motor generators/starters, etc., capable of solving problems such as stalling and unbalanced motors

Inactive Publication Date: 2008-11-26
SIEMENS IND INC
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause unbalanced currents and possibly cause the motor to enter a stall condition

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System and method for individual phase motor over voltage protection
  • System and method for individual phase motor over voltage protection
  • System and method for individual phase motor over voltage protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] first reference figure 1 , a solid state motor starter / controller 20 (hereinafter referred to simply as the starter or controller) is shown. One application of the controller 20 is as an elevator starter. For hydraulic lifts, the motor controller 20 may be used to drive a pump. Every time a movement of the elevator car is commanded, the motor controller 20 must then activate the elevator motor until it reaches operating speed and operates in the run mode. Such a motor controller 20 can only be used in the upward direction, as gravity can be used in the downward direction.

[0023] The motor controller 20 includes a housing 22 that includes a housing base 24 , a heat sink 26 and a cover 28 . The motor controller 20 includes a plurality of solid state switches 32 in the form of thyristors, such as silicon controlled rectifier (SCR) pairs connected back to back, see FIG. 2 . Here, for simplicity, the SCR pair 32 is simply referred to as SCR. Triacs may also be used. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A motor controller comprises a plurality of solid state switches each for connection between an AC line and a motor winding terminal for controlling application of AC power to the motor. A plurality of voltage sensors, each associated with one of the solid state switches, sense voltage for an associated motor winding. A control circuit controls operation of the solid state switches. The control circuit adjusts firing to one of the solid state switches if the sensed voltage for the associated winding varies from a threshold voltage by a select amount.

Description

technical field [0001] The present invention relates to a motor controller, and more particularly to a system and method for overvoltage protection of a single-phase motor. Background technique [0002] Solid state starters / controllers have been widely used to control the application of power to AC induction motors. This conventional starter / controller (hereinafter referred to simply as the starter or controller) uses solid state switches to control the application of AC line voltage to the motor. The switch may be a thyristor such as a silicon controlled rectifier (SCR) or a triac. [0003] A known motor controller in the form of an elevator starter provides motor protection in the form of overload and current unbalance faults. This current imbalance fault is recorded as a single phase fault. A fault occurs and experience forces the ratio of minimum current to maximum current to be reduced by 30%. One of the circumstances that forces this ratio to a low level is a volta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/02H02H7/08
CPCB66B1/30H02P7/295H02P1/28H02H7/09
Inventor S·梅休D·祖祖利S·瓦克菲尔德
Owner SIEMENS IND INC