Electromotive force-based control system for a child swing

摘要

A control system for a child swing comprising a swing arm mechanically coupled to a motor. The control system is configured to monitor electromotive force (EMF) generated by the motor at an input signal line and is configured to use the monitored EMF to control a speed of the motor.

主权项

1. A child swing, comprising:
a motor; at least one swing arm; a drive mechanism mechanically coupling the motor to the swing arm such that torque output by the motor imparts force on the swing arm; and a control system configured to monitor electromotive force (EMF) generated by the motor at an input signal line and configured to use the monitored EMF to control a speed of the motor to maintain a phase relationship between a phase of the drive mechanism and a phase of the at least one swing arm, wherein the control system is configured to use the monitored EMF to determine if the child swing has experienced a stall condition where arcuate motion of the swing arm has been disrupted.