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Temperatrue protection control for starter of motor

A technology of electric motors and starters, which is applied in motor control, starters of single multi-phase induction motors, motor generators/starters, etc., and can solve problems such as excessive energy consumption and reduced equipment reliability

Inactive Publication Date: 2012-05-09
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fans and blowers add another element to equipment that can fail without warning, thereby reducing equipment reliability
Additionally, excessive energy is consumed due to the need to run the fan at all times

Method used

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  • Temperatrue protection control for starter of motor
  • Temperatrue protection control for starter of motor
  • Temperatrue protection control for starter of motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] figure 1 is a block diagram of a motor starter temperature protection control device 10 according to the present invention included in a motor starter 12 for controlling a motor 14 connected to a power source 15 . The control device 10 includes a central processing unit 28, such as a microprocessor, microcontroller, PLC or any other device for electrical signal processing, and the motor starter temperature protection control device 10 controls the motor in an override manner depending on the operating temperature of the device. Operation of the starter 12. As shown in 1, the control device 10 of the present invention is shown for use in a three-phase motor starter. The motor starter 12 connects power from the three-phase supply 15 to the motor 14 in a well-known manner, by means of control coils 16, 18 and 20 on the one hand, and a pair of SCRs (not shown) on the one hand, which are generally clamped Between the two conductive busbars, represented in block diagram for...

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PUM

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Abstract

A motor starter temperature protection control in which an ambient temperature sensor is positioned on an inside cover of the motor starter to sense ambient temperature across the power poles and heat sinks and provide an ambient temperature signal indicative of the ambient temperature in the motor starter enclosure. The microprocessor is programmed to periodically monitor the ambient and power pole temperature signals and compare these signals against a fan-on limit, and if the signals exceed the fan-on limit, the control turns on the internal fans of the motor starter. The control continuesto monitor the ambient and power pole temperatures and if either should exceed a maximum temperature limit, the motor starter is placed in a motor shutdown mode, unless an optional temperature override has been set. Upon motor shutdown, the control continues to monitor temperatures and track how long it takes for the motor starter to cool down, and if it takes too long to cool down, a maintenanceflag is set to indicate that cleaning or preventive maintenance is required.

Description

technical field [0001] The present invention relates generally to control systems for motor starters, and more particularly to methods and apparatus for tracking temperature in a motor starter and controlling the motor starter based on said temperature tracking. Background technique [0002] Many electrical installations use one or more methods for thermal protection. One of the most common ways to use temperature protection is to use a thermistor, which is a heat-sensitive resistor that changes resistance as temperature changes. Typically, the thermistor is connected to electronic monitoring circuitry that is configured so that it responds to a predetermined resistance value. When the stated resistance value is reached, the electronic monitoring circuit disconnects or connects the temperature protection circuit which then disconnects the device, most electrical devices use a thermistor as protection. Therefore, the degree of protection provided depends only on the locatio...

Claims

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Application Information

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IPC IPC(8): H02H5/04H02P1/26H02H7/085H02K11/00H02P29/02
CPCH02H7/0852
Inventor 詹姆斯·A·博克尔
Owner EATON INTELLIGENT POWER LIMITED