Motor controller

A motor controller comprising:

• a driving IC that receives a driving signal for driving a motor and controls a rotation speed of the motor using the driving signal;
• and
• a sensor that detects the rotation speed of the motor, wherein
• the driving IC includes:
• a sensor signal output terminal that outputs a sensor signal generated by a pulse signal from the sensor;
• and
• a driving signal input terminal that receives the driving signal,
• the motor controller further includes:
• a first switch that short-circuits the sensor signal output terminal and the driving signal input terminal;
• and
• a second switch that short-circuits a power supply line that connects the driving IC to a power supply and the driving signal input terminal, and
• the driving IC rotates the motor at a first rotation speed when the first switch is turned on, the second switch is turned off, and the sensor signal output terminal and the driving signal input terminal are short-circuited, rotates the motor at a second rotation speed slower than the first rotation speed or stop the motor when the second switch is turned on, the first switch is turned off, and the power supply line and the driving signal input terminal are short-circuited, and rotates the motor at a third rotation speed faster than the first rotation speed when both the first and second switches are turned off, and the sensor signal output terminal, the driving signal input terminal, and the power supply line are not short-circuited.

A motor controller, comprising:

• a driving IC that receives a driving signal for driving a motor and controls a rotation speed of the motor using the driving signal;
• and
• a sensor that detects the rotation speed of the motor, wherein
• the driving IC includes:
• a sensor signal output terminal that outputs a sensor signal generated by a pulse signal from the sensor;
• and
• a driving signal input terminal that receives the driving signal,
• the sensor signal output terminal and the driving signal input terminal are connected by a connecting portion,
• the driving IC rotates the motor at a first rotation speed different from the rotation speed of the motor driven according to the driving signal using the sensor signal input to the driving signal input terminal, and
• a second switch that short-circuits a power supply line that connects the driving IC to a power supply and the driving signal input terminal, wherein
• the driving IC rotates the motor at a second rotation speed slower than the first rotation speed or stops the motor when the second switch is turned on and the power supply line and the driving signal input terminal are short-circuited.