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Thermal compensation controller system for starter of motor and thermal compensation method

A technology for motors and starters, applied in motor generator/starter, motor control, motor generator control, etc., can solve problems such as increasing costs

Inactive Publication Date: 2005-05-11
EATON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, thermal compensation adds additional cost to the manufacture of the device due to the additional components

Method used

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  • Thermal compensation controller system for starter of motor and thermal compensation method
  • Thermal compensation controller system for starter of motor and thermal compensation method
  • Thermal compensation controller system for starter of motor and thermal compensation method

Examples

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Embodiment Construction

[0016] 1 is a block diagram of a motor starter thermal protection and compensation controller 10 included in a motor starter 12 that controls a motor 14 connected to a power source 15 according to the present invention. The controller 10 includes a central processing unit 28, such as a microprocessor, microcontroller, PLC, or any other device for electrical signal processing. The motor starter thermal protection controller 10 controls the function of the motor starter 12 according to the device 12, the environment, and the operating temperature of the motor 14, together with the look-up table stored in the memory 29.

[0017] As shown in FIG. 1, the controller 10 of the present invention is shown in a three-phase motor starter application. In a well-known manner, the motor starter 12 relays the power from the three-phase power supply 15 to the motor 14, partly by controlling the coils 16, 18 and 20, and partly by controlling a pair usually fixed to two, in block diagram The form o...

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PUM

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Abstract

A motor starter thermal compensation controller (10) is disclosed in which an ambient temperature sensor (36), additional temperature sensors (30, 32, 34) and a microprocessor (28) are arranged. The controller (10) adjusts the output of the motor starter (12) according to the change (200) in operating temperature so that when the ambient temperature increases, or when the internal resistance of the device increases with temperature , keeping the output constant. To adjust the output, the system increases the full load ampacity (96) to compensate for the temperature increase. If the ampacity reaches the limits of the device (98, 108), the starter (12) is prevented from engaging the motor (14) with the power source until it has cooled sufficiently (106).

Description

Technical field [0001] The present invention generally relates to a control system for a motor starter, and more specifically to a method and device for compensating the motor starter for an increase in temperature. Background technique [0002] Many electrical devices use one form or another of thermal protection. One of the most common forms of temperature protection includes the use of a thermistor, which is a heat-sensitive resistor that changes its resistance as temperature changes. Usually, the thermistor is connected to an electronic monitoring circuit that is set to react to a predetermined resistance value. When the resistance value is reached, the electronic monitoring circuit is turned off or turned on, the temperature protection circuit, and then the temperature protection circuit turns off the device. Most electrical devices are protected by a single thermistor. Thus, the level of protection provided depends only on the arrangement of this single thermistor. In other...

Claims

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Application Information

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IPC IPC(8): H02P1/00H02H7/08H02P1/16H02H7/085H02K11/00
CPCH02H7/0816H02H7/0852H02M1/32H02P29/68H02M1/327
Inventor 詹姆斯·艾伦·贝克
Owner EATON CORP