A control device for electric motors and a method for monitoring the serviceability of a transmission part arranged for transmission of torque between an electric motor and a load during operation. Although a fee is typically charged for access to the digital data content, e. A circuit board comprising electronic circuitry for operating the lock mechanism is disposed in the housing. Based a difference between the first and second resistances caused by in increase in thermal conductivity between the magnetic sensor and a medium as the magnetic head gets closer to the medium, at least one of a spacing and a contact between the magnetic sensor and the medium are determined. Interactions may incorporate demand response signals sent to the resources at their respective facilities.