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Starting, protecting and energy-saving device of alternating current asynchronous motor

An asynchronous motor and protection device technology, applied in emergency protection circuit devices, motor generators/starters, motor control, etc., can solve the problems of power failure, poor shock resistance, and high maintenance costs during the start-up process, and reduce compound shocks. , The effect of long safety life and strong anti-interference ability

Inactive Publication Date: 2019-10-22
王振铎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The AC asynchronous motor has the advantages of simple structure, stable performance, and mature technology, so it is widely used in the driving of various power equipment. The start of the existing AC asynchronous motor usually requires a step-down start, and a step-down transformer or Power electronic devices are used, but when step-down transformers are used, there is a voltage mutation process during the start-up process, and the start-up process needs to be cut off instantaneously, causing current shocks; and power electronic devices will generate large harmonics. The low-frequency start-up is used for frequency conversion speed regulation, because the power electronic devices will generate rich harmonics, which will cause the motor to heat up and be easily damaged, and the power electronic devices have poor impact resistance, high failure rate, and high maintenance costs

Method used

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  • Starting, protecting and energy-saving device of alternating current asynchronous motor
  • Starting, protecting and energy-saving device of alternating current asynchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: as figure 1 As shown, the AC asynchronous motor starting and protection device includes an electromagnetic balance adjustable reactor 1, a current detection device 2, and a comparison controller 3; the electromagnetic balance adjustable reactor 1 includes an iron core 11 and the iron The forward coil 12 wound on the core 11, the iron core 11 is an annular iron core; or the iron core 11 is an E-shaped iron core; or the iron core 11 is a rod-shaped iron core, and the cross section of the rod-shaped iron core is circular or arbitrary Polygonal; or the iron core 11 is a C-shaped iron core; on the iron core 11, a reverse coil 13 with the same number of turns as the forward coil 12 and opposite to the winding direction is wound; the adjacent forward coil 13 One end of the coil 12 is connected with one end of the reverse coil 13 as the input end of the electromagnetic balance type adjustable reactor 1; the input end of the electromagnetic balance type adjustable ...

Embodiment 2

[0017] Embodiment 2: as figure 2 As shown, the energy-saving device for starting and protecting an AC asynchronous motor includes an electromagnetic balance adjustable reactor 1, a power factor detection device 6, and a comparison controller 3; the electromagnetic balance adjustable reactor 1 includes an iron core 11 and the The forward coil 12 wound on the iron core 11, the iron core 11 is an annular iron core; or the iron core 11 is an E-shaped iron core; or the iron core 11 is a rod-shaped iron core, and the cross-section of the rod-shaped iron core is circular or any polygon; or the iron core 11 is a C-shaped iron core; the iron core 11 is also wound with a reverse coil 13 with the same number of turns as the forward coil 12 and opposite directions; the adjacent One end of the forward coil 12 is connected to one end of the reverse coil 13 as the input end of the electromagnetic balance type adjustable reactor 1; the input end of the electromagnetic balance type adjustable...

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Abstract

The invention discloses a starting and protecting device of an alternating current asynchronous motor. The starting and protecting device comprises an electromagnetic balance type adjustable reactor,a current detection device and a comparison controller. The current detection device is arranged at the output end of the electromagnetic balance type adjustable reactor and is connected with the comparison controller, and the comparison controller controls opening and closing of an end switch and a gear switch. The starting and protecting device of an alternating current asynchronous motor has the advantages that: the regulating process is stable, no additional harmonic wave exists, and large impact cannot be caused in the protection process; and moreover, as the actuating elements are all mechanical elements, the regulating device has the high anti-interference capability, the low failure rate, the long safety life and no pollution to the power grid, reduces the composite impact of the power grid, reduces the capacity of a matched transformer, reduces the construction cost and the operation cost of the power grid, reduces the maintenance cost of the motor and the distribution networkelements due to reliable protection function, reduces the heating of distribution network elements and the motor, and has safety, reliability and energy conservation.

Description

Technical field: [0001] The invention relates to electric equipment, in particular to an AC asynchronous motor starting and protection energy-saving device. Background technique: [0002] The AC asynchronous motor has the advantages of simple structure, stable performance, and mature technology, so it is widely used in the driving of various power equipment. The start of the existing AC asynchronous motor usually requires a step-down start, and a step-down transformer or Power electronic devices are used, but when step-down transformers are used, there is a voltage mutation process during the start-up process, and the start-up process needs to be cut off instantaneously, causing current shocks; and power electronic devices will generate large harmonics. The low-frequency start-up is used when the speed changer is used for frequency conversion speed regulation. Because the power electronic devices will generate rich harmonics, the motor will heat up and be easily damaged. Mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/16H02P29/024H02P29/028H02P23/26H02H7/08
CPCH02H7/08H02P1/16H02P23/26H02P29/027H02P29/028H02P2207/01
Inventor 王振铎
Owner 王振铎
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