Patent ID: 9217429
Filing Date: 2015-12-22
Classification: F04B,H02P

Abstract:
1. A linear compressor, comprising: a fixed member having a compression space therein; a movable member linearly reciprocated in the fixed member to compress a refrigerant sucked into the compression space; one or more springs provided to elastically support the movable member in a motion direction of the movable member; a motor connected to the movable member to linearly reciprocate the movable member in an axial direction; and a motor controller that performs a cooling capacity modulation by the reciprocation of the movable member according to a load, by controlling an AC voltage applied to the motor so that a stroke of the movable member is proportional to a magnitude of the AC voltage applied to the motor, wherein the motor controller comprises a rectifier that receives AC power and outputs a DC voltage, an inverter that receives the DC voltage, converts the DC voltage to the AC voltage according to a control signal, and supplies the AC voltage to the motor, a current sensor that senses a current flowing between the motor and the inverter, and a control unit that integrates the current sensed by the current sensor, calculates an attenuation voltage by multiplying the integrated current by 1/Cr, generates a new control signal to produce a new AC voltage corresponding to a difference between the AC voltage and the attenuation voltage, and applies the new control signal to the inverter, wherein Cr is a capacitance.