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Method of controlling motor drive speed

A driving speed and motor driving technology, applied in pump control, control system, motor control, etc., can solve problems such as air conditioner stop running, cannot run air conditioner compressor, failure, etc., and achieve the effect of preventing overcurrent

Inactive Publication Date: 2006-06-14
LG ELECTRONICS INC
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  • Abstract
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Problems solved by technology

[0010] Therefore, there is a problem of not being able to run the air conditioner compressor if the CT fails
[0011] In addition, if the motor for the air conditioner compressor is accelerated back to the original speed instantaneously after it has been decelerated or has stopped through the above two steps S5 and S7, other adjacent components constituting the air conditioner may malfunction due to the instantaneously generated overcurrent , causing the air conditioner to stop operating

Method used

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Embodiment Construction

[0020] Exemplary embodiments according to the present invention will now be described in detail with reference to the accompanying drawings. In the following description, when a description of well-known functions and structures included in the present invention may make the subject matter of the present invention unclear, a detailed description thereof will be omitted. Although the following embodiments of the invention will be described with reference to a BLDC motor for driving a compressor, the invention can also provide control of a washing machine motor and control of a synchronous reluctance motor.

[0021] figure 2 A structural block diagram of a sensorless BLDC motor controller for driving a compressor according to an embodiment of the present invention is shown.

[0022] refer to figure 2 , the rectifier 100, which is a power converter, rectifies an alternating voltage (AC) into a direct current (DC) voltage, and the direct current voltage is charged into a subsequ...

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Abstract

The present invention provides a method of controlling the drive speed of a motor operating in an overload state. The method includes the steps of: driving the motor at a predetermined reference speed; detecting a phase voltage and a phase current applied to the motor; determining whether the motor is operating in an overload state based on the detected phase voltage and phase current; Operate the motor in an overload state. Therefore, the present invention can prevent an overcurrent that occurs due to the momentary acceleration of the motor to a predetermined initial speed.

Description

[0001] This application claims priority from Korean Patent Application No. 2004-103177 filed with the Korean Intellectual Property Office on December 8, 2004, the entire disclosure of which is hereby incorporated by reference. technical field [0002] The invention relates to a motor control method, in particular to a method for controlling the driving speed of a motor running in an overload state. Background technique [0003] Generally, an air conditioner as an example of air handling equipment is equipped with a compressor motor. The motor is controlled based on a motor drive algorithm such that the drive speed of the motor is reduced in an overload condition and returns to normal speed after the overload condition disappears. [0004] A system using this algorithm, such as an air conditioning system, includes a current transformer (hereinafter referred to as "CT") incorporated in the power supply. When the compressor is running, the system detects the current in the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/00
CPCH02P29/02F04C28/08F04C28/28F04C2240/403F04C2270/0525F04C2270/075F04C2270/10F04C2270/605
Inventor 梁顺培金兑暻朴晟闵金泰元
Owner LG ELECTRONICS INC
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