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AssigneeSeiko Epson Corporation
InventorsHiroyuki Kojima, Makoto Okeya, Hiroshi Yabe, Noriaki Shimura, Joji Kitahara
Estimating the term…
In an electronic device having a stepping motor which can be driven more quickly than in a normal driving operation without causing a significant increase in power consumption, a detecting coil control circuit is provided which controls a connection circuit serving to open and close a detecting coil that is wound coaxially with a driving coil, in such a manner that the detecting coil is opened during the period in which a quick driving pulse is supplied to the driving coil. After supplying the quick driving pulse, a driving controller controls a driving circuit so as to open the driving coil, while the driving controller closes the detecting coil so that a voltage induced in the detecting coil by an electromotive force is detected by a position detecting circuit thereby determining the position of a rotor. The chance that the driving coil and the detecting coil act as electromagnetic brakes is minimized thereby ensuring that the quick driving operation is performed with low power consumption. During the quick driving operation in which the rotor rotates at a high speed, the position of the rotor is monitored thereby ensuring that the quick driving operation is performed in a stable fashion. Additionally, the timing of the delivery of the driving pulses may be varied in response to a measured voltage.
An electronic device comprising:
A method of controlling an electronic device including a stepping motor, said stepping motor including a rotor magnetized in the form of a magnetic multipole and a stator including a driving coil and a detecting coil, said rotor being driven to rotate in said stator, said method comprising the steps of:
An electronic device comprising:
A method of controlling an electronic device including a stepping motor, said stepping motor including a rotor magnetized in the form of a magnetic multipole and a stator including a driving coil, said rotor being driven to rotate in said stator, said method comprising the steps of:
An electronic device comprising:
An electronic device comprising:
An electronic device comprising:
A method of controlling an electronic device including a stepping motor, said stepping motor including a rotor magnetized in the form of a magnetic multipole and a stator including a driving coil, said rotor being driven to rotate in said stator, said method comprising a driving step for supplying a driving pulse to said driving coil to drive said rotor, wherein the timing of supplying said driving pulse is varied depending on the power supply voltage of the driving pulse.
An electronic device comprising:
Dependencies are inferred from the claim text.