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US 2001/0019249 A1Published application
Motor apparatus
AssigneeSanyo Electric Co., Ltd.
InventorsHideaki Kato, Takashi Ogawa, Tetsuo Nomoto, Yuuichi Izawa
Life of this patent
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AssigneeSanyo Electric Co., Ltd.
InventorsHideaki Kato, Takashi Ogawa, Tetsuo Nomoto, Yuuichi Izawa
Estimating the term…
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. When a comparison voltage Ews, Eus, Evs obtained by dividing the voltage between the divided voltage Wa, Ua, Va of the preceding phase in the order and the divided voltage E0 is applied to respective −terminal, as the phase is shifted in the opposite direction, the position can be detected by making a slant position rear the flat point the intersection. Thereby, a motor apparatus such as DC brushless motor wherein the intersection whose position it to be detected can be detected precisely even when the intersection is a flat crossing and is unclear.
A motor apparatus such as DC brushless motor comprising a rotor having a plurality of magnetized poles, and a multiple-phase stator coil disposed to supply said rotor with rotational field during the conduction, wherein a rotational field is formed by conducting a predetermined said stator coil with voltage generated in an inverter circuit, and the time to perform said conduction is controlled based on a position detection signal obtained by comparing and detecting the induced voltage generated in said stator coil of the phase not conducted as above by the rotation of said rotor and a predetermined voltage by means of a comparator provided for each phase of said multiple phases, comprising:
A motor apparatus such as DC brushless motor comprising a rotor having a plurality of magnetized poles, and a multiple-phase stator coil disposed to supply said rotor with rotational field during the conduction, wherein a rotational field is formed by conducting a predetermined said stator coil with voltage generated in an inverter circuit, and the time to perform said conduction is controlled based on a position detection signal obtained by comparing and detecting the induced voltage generated in said stator coil of the phase not conducted as above by the rotation of said rotor and a predetermined voltage by means of a comparator provided for each phase of said multiple phases, comprising:
A motor apparatus such as DC brushless motor comprising a rotor having a plurality of magnetized poles, and a multiple-phase stator coil disposed to supply said rotor with rotational field during the conduction, wherein a rotational field is formed by conducting a predetermined said stator coil with voltage generated in an inverter circuit, and the time to perform said conduction is controlled based on a position detection signal obtained by comparing and detecting the induced voltage generated in said stator coil of the phase not conducted as above by the rotation of said rotor and a predetermined voltage by means of a comparator provided for each phase of said multiple phases, comprising:
A motor apparatus such as DC brushless motor comprising a rotor having a plurality of magnetized poles, and a multiple-phase stator coil disposed to supply said rotor with rotational field during the conduction, wherein a rotational field is formed by conducting a predetermined said stator coil with voltage generated in an inverter circuit, and the time to perform said conduction is controlled based on a position detection signal obtained by comparing and detecting the induced voltage generated in said stator coil of the phase not conducted as above by the rotation of said rotor and a predetermined voltage by means of a comparator provided for each phase of said multiple phases, comprising:
A motor apparatus such as DC brushless motor comprising a rotor having a plurality of magnetized poles, and a multiple-phase stator coil disposed to supply said rotor with rotational field during the conduction, wherein a rotational field is formed by conducting a predetermined said stator coil with voltage generated in an inverter circuit, and the time to perform said conduction is controlled based on a position detection signal obtained by comparing and detecting the induced voltage generated in said stator coil of the phase not conducted as above by the rotation of said rotor and a predetermined voltage by means of a comparator provided for each phase of said multiple phases, comprising:
An inverter driving electric motor apparatus for driving an electric motor by an inverter converting DC power source into AC power source, and holding/canceling the overcurrent protection operation for stopping said inverter driving based on the output of overcurrent detection, by comparing the detection voltage obtained by sensing the current supplied to said inverter from said DC power source and a predetermined reference voltage by means of a comparator, comprising:
Dependencies are inferred from the claim text.