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Low current electric motor starter

A technology for motors and starting windings, applied in motor generators/starters, starters of single-phase induction motors, etc., can solve problems to be verified, affecting reliability, low power, etc.

Active Publication Date: 2010-06-23
SENSATA TECHNOLOGIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] With regard to such components, electromechanical devices have the disadvantage that wear over time affects their reliability, and solid-state electronic circuits are relatively expensive and their reliability has yet to be proven
Although motor starters are effective for de-energizing PTC resistors and provide low power by essentially eliminating the start winding after starting, such starters using current transformers are relatively expensive

Method used

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  • Low current electric motor starter
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Examples

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Embodiment Construction

[0019] refer to figure 1 , a single-phase resistance-start AC motor (which may advantageously use a motor starter according to the first preferred embodiment of the invention) comprises a main winding 2 connected in parallel with a starting winding 4 and passed through lines L1, L2 is connected to a suitable AC power source. The start winding 4 is connected to the supply line L1 and in turn connected in series to a positive temperature coefficient (PTC) resistor 12 and a triac or triac 14 having two main terminals T1 , T2 and a gate T3 . The reed switch 16 comprises a coil 16a connected in series to the main winding 2 and to the line L2, and said coil 16a is placed to be magnetically coupled thereto adjacent to normally open reed switch contacts 16b, 16c, said reed switch contacts 16b , 16c are movable into and out of engagement with each other. The reed switch contact 16b is connected to a position intermediate the PTC resistor 12 and the triac 14 . The reed switch contact...

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Abstract

A low cost motor starter is shown having a PTC resistor 12 serially connected to a triac 14 and a bias resistor in turn adapted to be connected to the start winding of a single phase motor. A reed relay 16 having a sense coil 16a serially connected to the main winding in one preferred embodiment and in parallel with the main and start windings in a second preferred embodiment, is magnetically coupled to reed contacts16b, 16c. Reed contact 16b is connected to a location intermediate the PTC resistor 12 and the triac 14 while reed contact 16c is connected to the gate of the triac. A gate signal phase shifting network comprising capacitor C1-R2 is also connected to reed contact 16c and the gate.

Description

[0001] related application [0002] This application claims priority to US Provisional Application No. 61 / 200,648, filed December 2, 2008. technical field [0003] This invention relates generally to motor starters, and more particularly to low power positive temperature coefficient resistance (PTC) motor starters, particularly for refrigerator compressor motors. Background technique [0004] A single phase AC motor consists of a main winding and an auxiliary or starter winding for starting the motor. Various components are used to open the start winding when the motor reaches a selected speed, such as centrifugal mechanisms, current relays, and more recently, solid state electronic circuits that respond to time or various motor operating parameters. [0005] With regard to such components, electromechanical devices have the disadvantage that wear over time affects their reliability, and solid-state electronic circuits are relatively expensive and their reliability has yet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/42
CPCH02P1/42
Inventor 小罗伯特·J·安德鲁斯拉塞尔·P·布罗德凯文·J·德罗普斯
Owner SENSATA TECHNOLOGIES INC
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