Various example embodiments are disclosed. According to one example embodiment, a magnetic therapy device may include a power source, a motor, a tachometer, and a microprocessor. The power source may be configured to supply power to the motor. The motor may be configured to control a disk upon which is mounted a plurality of magnets. The tachometer may be configured to monitor a magnetic field generated by the plurality of magnets and provide a signal to a microprocessor based on the monitored magnetic field. The microprocessor may be configured to control the motor based on the signal received from the tachometer.