connects a servomotor via a clutch to a shaft after the motor has started up from a standstill to a speed in synchronism with the supply frequency to the servomotor the clutch may also be actuated to disengage the servomotor from the shaft when the servomotor is slowed to a predetermined speed during stopping of the servomotor a transmission is employed between the servomotor and the shaft to compensate for any shocks to the motor when engaging the clutch application_number US 37346189 A description referring to fig1 a line 10 extends from electricity supply means not shown of a predetermined voltage and frequency and is connected to the drive systems of a ring spinning machine not shown in this case two drive systems are provided in the machine viz a first system 12 for the spindle drive and a second system 14 for driving the drafting arrangements and ring bank the spindle drive is of secondary importance and will therefore be described only briefly it is assumed in fig1 that each spindle is driven by an individual electric motor 16 in practice a modern ring spinning machine may have up to 600 spindles on each side of the machine the various motors 16 are connected by way of an energy distribution system 18 to a common frequency converter 20 in the end head of the machine the converter 20 can comprise for example a rectifier not shown and connected thereto an inverter not shown the motors 16 can be low cost motors for example asynchronous motors as already indicated the control is not limited to such a drive system for the spindles the spindles could be driven for example in groups or even by.