Electric Motor Stall Heating With Temperature Threshold Control

The patent replaces the mechanical vibration-based haptic feedback system with a thermal feedback system. Instead of using linear resonant actuators to create mechanical vibrations, the system uses an electric motor operated in stall condition to generate heat, which is then transferred to the user through thermal conduction. This substitution eliminates the disruptive mechanical vibrations while maintaining the ability to provide tactile feedback to the user.

The patent changes the operating parameters of the electric motor from normal rotational operation to stall condition. By controlling the motor to operate in stall condition, the system transforms the motor's energy output from mechanical rotation to thermal energy generation. This parameter change allows the same motor component to provide heating function instead of mechanical motion, resolving the contradiction between providing haptic feedback and avoiding disruptive vibrations.

The patent implements a temperature feedback control system using a temperature sensor to monitor the motor's thermal state. The sensor continuously detects the motor temperature and provides feedback to the control circuitry, which adjusts the stall condition duration or intensity to maintain the motor temperature within safe operating limits. This feedback mechanism enables the system to provide thermal feedback to the user while preventing overheating damage to the motor.

The patent employs periodic or pulsed stall conditions rather than continuous stalling. The control circuitry activates the motor in stall condition for predetermined time intervals, then allows the motor to cool down or return to normal operation. This periodic action pattern enables cumulative heat transfer to the user while preventing the motor temperature from exceeding safe thresholds, thus resolving the contradiction between thermal feedback effectiveness and motor safety.