the motor circuit causes the short circuiting on passing the limit value by activating one or more of the semiconductor components the multi phase electric motor is used as the single drive of a rotor of the textile machine wherein the semiconductor components of the phase control bridge on passing a predeterminable limit value contactlessly short circuit the electric motor to brake the electric motor application_number US 98955406 A description the view in fig1 shows a 3 phase electric motor 1 which can be used for example in a textile machine as a single drive of a rotor the rotor is contactlessly mounted in the embodiment presently described for the contactless mounting of the rotor a magnetic bearing is provided which can be designed actively or passively for the contactless mounting a gas bearing or a combined gas magnetic bearing may also be used the rotor is designed as a permanent magnet armature of the electric motor 1 the electric motor 1 for each phase r s t comprises a winding which is supplied via supply lines 2 with a supply voltage v mot to activate the electric motor 1 a motor circuit 3 is provided which is in operative connection with a control device not shown the control device is for example a microprocessor and an overwritable eeprom as the memory the motor circuit 3 comprises a plurality of semiconductor components 4 5 6 7.