Encoder and motor

An encoder comprising:

• a magnet attached to a rotating shaft;
• a power generation device:
• including a Wiegand wire and a coil wound around the Wiegand wire;
• disposed to face the magnet;
• generating a first pulse by the Wiegand wire due to large Barkhausen effect as the magnet rotates;
• and
• generating a second pulse by the coil due to induced electromotive force as the magnet rotates a capacitor configured to accumulate electric charges of the first pulse and the second pulse;
• a pulse detector configured to output a pulse detection signal when a voltage of the capacitor exceeds a pulse detection threshold;
• and
• a controller that:
• is operable by electric power supplied from the capacitor;
• performs counting operation as an operation to count up multi-rotation data on a basis of the pulse detection signal, a wait operation to wait for a preset waiting time, and a discharging operation to discharge the capacitor after the wait operation, wherein
• the waiting time is a time that at least accumulating of the electric charge of the first pulse is completed, and there is no increase in the voltage of the capacitor.