Electrically operated hydraulic pump

Details Electrically operated hydraulic pump Electrically operated hydraulic pump

2011-04-19

2011-04-19

Freay, Charles G (Department: 3746)

Pumps

Condition responsive control of pump drive motor

Responsive to pump or pump fluid temperature

C417S044100, C417S044110, C318S400110, C318S400340

Reexamination Certificate

active

07927079

ABSTRACT:
An electrically operated hydraulic pump having a pump portion and a motor portion includes rotation controlling means controlling rotation of a rotor, first rotor position detecting means detecting rotational position of the rotor on the basis of speed electromotive force induced by exciting coils, second rotor position detecting means detecting the rotational position of the rotor on the basis of magnetic field of a magnet provided at the motor portion, and motor operating condition detecting means detecting operating condition of the motor portion. The rotation controlling means switches a first rotation controlling based on the rotational position of the rotor detected by the first rotor position detecting means, and a second rotation controlling based on the rotational position of the rotor detected by the second rotor position detecting means, on the basis of a result detected by the motor operating condition detecting means.

REFERENCES:
patent: 5970733 (1999-10-01), Hamaoka et al.
patent: 6396229 (2002-05-01), Sakamoto et al.
patent: 6462492 (2002-10-01), Sakamoto et al.
patent: 7036892 (2006-05-01), Suzuki et al.
patent: 2002-317772 (2002-10-01), None

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