Abstract: A hermetic compressor to conduct electricity to a stator coil without peeling off a coating formed on the coil while preventing the separation of the stator coil or lead wire from a compressible terminal. In the hermetic compressor including a hermetic container, a compression device to compress a refrigerant, a drive device to drive the compression device, the drive device including a stator formed by winding the stator coil on a core and a rotor to rotate inside the stator, the lead wire extending from a terminal block to receive electricity, and a compressible terminal to be compressed after the stator coil and the lead wire are inserted into the compressible terminal, the stator coil is formed by covering an aluminum wire with an enamel coating, and the compressible terminal includes electricity-conduction protrusions to piece the enamel coating so as to come into contact with the aluminum wire.

Abstract: Disclosed herein is a control method of a sensorless brushless direct current (BLDC) motor, and more particularly, a drive control method of a concentrated winding BLDC motor which prevents shutdown due to failures of detection of zero cross points (ZCPs). A reference voltage inputted to comparators is altered to set new reference points. ZCPs are detected using the new reference points to avoid uneven detection of the ZCPs. Phase commutation is corrected corresponding to the ZCPs detected using the new reference points to reduce current ripple, thereby leading to stable control of the sensorless BLDC motor. To this end, the control method adds or subtracts a preset certain value to/from a reference voltage to produce a new reference voltage, and detects ZCPs with respect to the new reference voltage to control drive of the sensorless concentrated winding BLDC motor.