Motor driving apparatus

A motor driving apparatus for driving a motor, the motor driving apparatus comprising:

• an amplifier circuit for receiving a signal from a detector and amplifying the signal with a set amplification factor, the detector outputting the signal in a sine wave shape in response to rotation of the motor;
• an A/D converting part for performing digital conversion by sampling the signal amplified by the amplifier circuit at a sampling timing in a predetermined cycle;
• an amplification factor setting part for changing setting of the amplification factor of the amplifier circuit, wherein, during a stabilization period, distortion occurs in a waveform of the signal amplified by the amplifier circuit after changing the setting of the amplification factor;
• and
• an amplification factor set timing command part for issuing a command, at a set time, to change the amplification factor by the amplification factor setting part, wherein
• the set time of the issuing of the command by the amplification factor set timing command part is a time that allows the stabilization period of the waveform of the signal amplified by the amplifier circuit to not overlay with the sampling timing.