Driving device, printer device, and method thereof
AssigneeToshiba Tec Kabushiki Kaisha
InventorTsutomu Kawamoto
Life of this patent
Estimating the term…
Abstract
A driving device for a stepping motor includes a motor driving circuit configured to generate a current waveform representing an electrical angle in synchronization with a mechanical angle of the stepping motor, and excite the stepping motor using the current waveform; a memory configured to store a value of the electrical angle; and a controller configured to: when a power supply to the stepping motor and the motor driving circuit is stopped, store a first value of the electrical angle held by the motor driving circuit in the memory; and when the power supply is resumed, replace a value of the electrical angle of the motor driving circuit with the first value while suppressing a rotational operation of the stepping motor.
Claims20
A driving device for a stepping motor comprising:
- a motor driving circuit configured to generate a current waveform representing an electrical angle in synchronization with a mechanical angle of the stepping motor, and excite the stepping motor using the current waveform;
- a memory configured to store a value of the electrical angle;
- and
- a controller configured to:
- when a power supply to the stepping motor and the motor driving circuit is stopped, store a first value of the electrical angle held by the motor driving circuit in the memory;
- and
- when the power supply is resumed, replace a value of the electrical angle of the motor driving circuit with the first value while suppressing a rotational operation of the stepping motor.
A printer device comprising:
- a conveyance roller configured to convey a medium;
- a stepping motor configured to supply a rotational driving force to the conveyance roller;
- a motor driving circuit configured to generate a current waveform representing an electrical angle in synchronization with a mechanical angle of the stepping motor, and excite the stepping motor using the current waveform;
- a memory configured to store a value of the electrical angle;
- and
- a controller configured to:
- when a power supply to the stepping motor and the motor driving circuit is stopped, store a first value of the electrical angle held by the motor driving circuit in the memory;
- and
- when the power supply is resumed, replace a value of the electrical angle of the motor driving circuit with the first value while suppressing a rotational operation of the stepping motor.
A method performed by a driving device having a stepping motor, a motor driving circuit, and a memory, configured to generate a current waveform representing an electrical angle in synchronization with a mechanical angle of the stepping motor, the method comprising:
- when a power supply to the stepping motor and the motor driving circuit is stopped, storing a first value of the electrical angle held by the motor driving circuit in the memory;
- and
- when the power supply is resumed, replacing a value of the electrical angle of the motor driving circuit with the first value while suppressing a rotational operation of the stepping motor.
Dependencies are inferred from the claim text.