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US 7,453,222 B2Granted
Sun roof drive device
AssigneesShinano Kenshi Co., Ltd., Yachiyo Kogyo Kabushiki Kaisha
InventorsTakashi Kanai, Takahiro Maruyama, Yutaka Nagai, Munehiro Kawai, Yoshikazu Ito
Life of this patent
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Abstract
The sun roof drive device opens and closes a vehicle sun roof by a DC brushless motor, which is driven by rectangular waves when high torque is required at a low rotational speed and which is driven by sinusoidal waves or pseudo-sinusoidal waves when low noise is required.
Claims8
A sun roof drive device for opening and closing a vehicle sun roof, comprising:
- a DC brushless motor acting as a drive source;
- a motor drive unit for switching drive voltage, which is applied to stator coils on the basis of a rotational position of a rotor detected by a magnetic sensor for detecting pole positions of a rotor magnet;
- a control unit controlling the opening and closing actions of the vehicle sun roof, with said motor drive unit, on the basis of a detection signal of the magnetic sensor;
- and
- a push-pull mechanism pushing and pulling a push-pull means, which is linked with said DC brushless motor by a speed reduction unit,
- wherein a position of the vehicle sun roof is detected on the basis of detection signals of the magnetic sensor, which correspond to three or two of three phases, and said control unit performs arithmetic processing so as to control the position and a speed of the vehicle sun roof on the basis of a count signal, which is generated by counting rising edges and trailing edges of pulses of the pole detection signals.
3 more elements
Dependencies are inferred from the claim text.