Tyre changing apparatus for demounting and mounting a tyre of a vehicle wheel

A tyre changing apparatus for demounting and mounting a tyre relative to a respective rim of a vehicle wheel comprising:

• a frame;
• a chuck, connected to the frame to rotate about an axis of rotation and connectable to the wheel to entrain it in rotation;
• a working tool, connected to the frame and movable towards and away from the chuck to interact with a bead of the tyre;
• an electric motor, connected to the chuck to apply a rotation speed and a working torque to the chuck;
• a controller configured to control the electrical motor, the controller receiving an electrical power input including:
• a power unit, wherein the power unit is powered through the electrical power input and delivers to the electric motor a supply voltage and a supply current as a function of a drive signal;
• a processing unit wherein the processing unit generates the drive signal and is programmed to:
• i) derive a control parameter, the control parameter representing the working torque applied by the electric motor,
• ii) set a torque-limiting function as a function of the control parameter, wherein the torque-limiting function prevents the electric motor from applying a working torque that is higher than a threshold value, wherein the processing unit includes an activated configuration, wherein the torque-limiting function is enabled, and a deactivated configuration, wherein the torque-limiting function is disabled,
• iii) derive an activation parameter and,
• iv) responsive to the activation parameter, commute between the activated configuration and the deactivated configuration.