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US 2009/0153090 A1Published application
Motor controller
AssigneeAsmo Co., Ltd.
InventorsHidenori ISHIHARA, Hiroaki YAMAMOTO, Nakatsune SHIRAI, Katsumi ENDO, Tomoki YAMASHITA
Life of this patent
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Abstract
A motor controller that outputs a drive signal to a direct-current motor to drive the motor is provided. The motor controller includes a drive circuit that generates the drive signal. The drive circuit superimposes on a direct-current voltage an alternating-current component having a frequency in the audible frequency range of the human ear, thereby generating the drive signal.
Claims7
A motor controller that outputs a drive signal to a direct-current motor to drive the motor, comprising:
- a drive signal generating section that generates the drive signal, wherein the drive signal generating section generates the drive signal by superimposing on a direct-current voltage an alternating-current component having a frequency in the audible frequency range of the human ear.
A method for controlling a direct-current motor, comprising:
- generating a drive signal that is output to a direct-current motor to drive the motor, wherein the drive signal is generated by superimposing on a direct-current voltage an alternating-current component having a frequency in the audible frequency range to the human ear.
Dependencies are inferred from the claim text.