Abstract: A motor apparatus, such as a DC brushless motor, is provided for the obtaining a position detection signal by detecting the intersection of the divided voltage of a bus voltage and three phases of the divided voltage of the three phases by a comparator which results in the central position of a flat portion. For the divided voltage for the three phases of the respective positive terminal of the comparator, the comparison voltage obtained by dividing the voltage between the divided voltage for the three phases of the following phase in the order and the divided voltage of the bus voltage is applied to the respective negative terminal. As the comparison voltage is phase shifted, the position can be detected by making a slant position ahead of the flat point of the intersection.

Abstract: A freon compressor comprises a compressor device and an electromotor device. The electromotor device is used for driving the compressor device and consists of a stator and a rotor rotating within the stator. The stator further consists of a stator core and stator windings wired on the stator core, and a three-phase sine alternating current waveform is applied to the stator windings. Therefore, the magnetic lines of force of the electromotor device are stabilized in space and time and noise is significantly reduced.

Abstract: A freon compressor comprises a compressor device and an electromotor device. The electromotor device is used for driving the compressor device and consists of a stator and a rotor rotating within the stator. The stator further consists of a stator core and stator windings wired on the stator core, and a three-phase sine alternating current waveform is applied to the stator windings. Therefore, the magnetic lines of force of the electromotor device are stabilized in space and time and noise is significantly reduced.

Abstract: The position detection signal Su, Sv, Sw obtained by detecting the intersection of the divided voltage E0 of the bus voltage and the divided voltage Ua, Va, Wa of the three phases U, V, W by the comparator CPu, CPv, CPw results in the central position of the flat portion. For the divided voltage Ua, Va, Wa of respective +terminal of the comparator CPu, CPv, CPw, the comparison voltage Evs, Ews, Eus obtained by dividing the voltage between the divided voltage Ua, Va, Wa of the following phase in the order and the divided voltage E0 is applied to respective −terminal. As the comparison voltage is phase shifted, the position can be detected by making a slant position ahead of the flat point the intersection.