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 (A) 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 impart a rotation speed and a working torque to it; - a controller which is configured to receive an electrical power input to feed the electric motor and which includes: a power unit , configured to deliver supply voltage and supply current as a function of a drive signal in order to control the electric motor ; a processing unit configured to generate the drive signal and programmed to derive a control parameter representing the working torque delivered to the electric motor and to apply a torque-limiting function as a function of the control parameter in such a way as to prevent the electric motor from delivering a working torque that is higher than a threshold value (C s ), characterized in that the processing unit is programmed to derive an activation parameter and, as a function of the activation parameter, to switch between an activated configuration, in which the torque-limiting function is enabled, and a deactivated configuration in which the torque-limiting function is disabled. - a frame ; - a chuck , connected to the frame to rotate about an axis of rotation (A) 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 impart a rotation speed and a working torque to it; - a controller which is configured to receive an electrical power input to feed the electric motor and which includes: a power unit , configured to deliver supply voltage and supply current as a function of a drive signal in order to control the electric motor ; a processing unit configured to generate the drive signal and programmed to derive a control parameter representing the working torque delivered to the electric motor and to apply a torque-limiting function as a function of the control parameter in such a way as to prevent the electric motor from delivering a working torque that is higher than a threshold value (C s ), characterized in that the processing unit is programmed to derive an activation parameter and, as a function of the activation parameter, to switch between an activated configuration, in which the torque-limiting function is enabled, and a deactivated configuration in which the torque-limiting function is disabled. a power unit , configured to deliver supply voltage and supply current as a function of a drive signal in order to control the electric motor ; a processing unit configured to generate the drive signal and programmed to derive a control parameter representing the working torque delivered to the electric motor and to apply a torque-limiting function as a function of the control parameter in such a way as to prevent the electric motor from delivering a working torque that is higher than a threshold value (C s ), <EOS>