Device and method for reducing vibration in a compressor

Abstract

A device and method for reducing vibration in a compressor are provided. The device for reducing vibration in a compressor may include a compressor controlled to be operated at a target operating velocity after starting; a power supply that supplies power to the compressor; and a controller that controls the power supply so that a magnitude or a phase of the power supplied to the compressor is changed. The controller may control the power supply so that vibration generated in the compressor is offset by an exciting force generated in the compressor within a predetermined time interval multiple times when the compressor starts or when the compressor stops during a target operation velocity operating of the compressor.

What is claimed is: 
     
         1 . A device for reducing vibration in a compressor, comprising:
 a compressor controlled to be operated at a target operating velocity after starting;   a power supply that supplies power to the compressor; and   a controller that controls the power supply so that a magnitude or a phase of the power supplied to the compressor is changed, wherein the controller controls the power supply so that vibration generated in the compressor is offset by an exciting force generated in the compressor within a predetermined time interval multiple times when the compressor starts or when the compressor stops.   
     
     
         2 . The device of  claim 1 , wherein the predetermined time interval corresponds to approximately half of a period of a natural frequency of the vibration. 
     
     
         3 . The device of  claim 1 , wherein when the compressor starts, the generation of the exciting force multiple times includes a first exciting force, and a second exciting force generated after the first exciting force and having a smaller magnitude than the first exciting force. 
     
     
         4 . The device of  claim 3 , wherein the first exciting force is an exciting force generated by a current applied to the compressor so that the compressor is operated at a first velocity, which is lower than the target operating velocity, and the second exciting force is an exciting force generated by a current applied to the compressor so that the compressor currently being operated at the first velocity is operated at the target operating velocity. 
     
     
         5 . The device of  claim 4 , wherein the first velocity corresponds to approximately half of the target operating velocity of the compressor. 
     
     
         6 . The device of  claim 1 , wherein when the compressor stops, the generation of the exciting force multiple times includes a third exciting force, and a fourth exciting force generated after the third exciting force and having a smaller magnitude than the third exciting force. 
     
     
         7 . The device of  claim 6 , wherein the third exciting force is an exciting force generated by a current applied to the compressor so that the compressor is operated at a first velocity, which is lower than the target operating velocity, and the fourth exciting force is an exciting force generated by a current applied to the compressor so that the compressor currently being operated at the first velocity stops. 
     
     
         8 . The device of  claim 7 , wherein the first velocity corresponds to approximately half of the target operating velocity of the compressor. 
     
     
         9 . The device of  claim 1 , wherein the generation of the exciting force multiple times is accomplished by an impulse current supplied to the compressor. 
     
     
         10 . A device for reducing vibration in a compressor, comprising:
 a compressor of a refrigeration cycle and operable at a target operating velocity;   a power supply that supplies power to the compressor; and   a controller that controls the power supply so that a magnitude or a phase of the power supplied to the compressor is changed, wherein the controller controls the power supply so that the compressor is accelerated or decelerated to a first velocity, which is less than the target operating velocity, when the compressor starts or when the compressor stops.   
     
     
         11 . The device of  claim 10 , wherein the controller controls the power supply so that the compressor is primarily accelerated to the first velocity, and after a predetermined time has elapsed, secondarily accelerated to the target operating velocity when the compressor starts. 
     
     
         12 . The device of  claim 11 , wherein the predetermined time corresponds to approximately half of a period of a natural frequency of the vibration. 
     
     
         13 . The device of  claim 10 , wherein the controller controls the power supply so that the compressor is primarily decelerated to the first velocity from the target operating velocity, and after a predetermined time has elapsed, stops when the compressor stops. 
     
     
         14 . The device of  claim 13 , wherein the predetermined time corresponds to approximately half of a period of a natural frequency of the vibration. 
     
     
         15 . The device of  claim 10 , wherein the first velocity is a velocity which is half of the target operating velocity. 
     
     
         16 . A method for reducing vibration in a compressor, comprising:
 primarily accelerating a stopped compressor to a first velocity; and   secondarily accelerating the compressor to a target operating velocity, wherein a time as long as approximately half of a period of a natural frequency of compressor vibration has elapsed from a primary acceleration start time of the compressor to a secondary acceleration start time of the compressor.   
     
     
         17 . The method of  claim 16 , wherein the first velocity is a velocity which is approximately half of the target operating velocity. 
     
     
         18 . The method of  claim 16 , further comprising:
 primarily decelerating the compressor currently operated at the target operating velocity to the first velocity; and   secondarily decelerating the compressor to be completely stopped.   
     
     
         19 . The method of  claim 18 , wherein a time as long as approximately half of a natural frequency of the compressor vibration elapses from a primary deceleration start time of the compressor to a secondary deceleration start time of the compressor. 
     
     
         20 . The method of  claim 18 , wherein a first exciting force of the compressor generated in the primary acceleration is larger than a second exciting force of the compressor generated in the secondary acceleration, and a third exciting force of the compressor generated in the primary deceleration is larger than a fourth exciting force of the compressor generated in the secondary deceleration.