Abstract: An apparatus and method for accelerating textile winder synchronous motor drives from standstill to rated running speed wherein a synchronous motor is first accelerated asynchronously to a first intermediate speed, then decelerated to and synchronized at a second intermediate speed, then accelerated synchronously to rated speed, while thereby limiting current drawn by the motor to levels not exceeding rated current. The method is automatically followed using apparatus which varies motor input frequency responsive to a predetermined sequence of control signals supplied from a signal source via a transient response profiler which converts sudden changes in signal strength to smooth, gradual changes. As more specifically described herein, only two controllers are needed, and a switching network including time-delay devices selectively supplies one signal or the other via an integrator to a variable frequency converter.

Abstract: An apparatus and method for jointly controlling textile winder package drive roll motors at constant speed and traverse device motors at varying speed, wherein at least a portion of the power generated during recurrent, e.g. periodic dynamic braking and deceleration by the traverse device motors is made available to drive the package drive roll motors. A single AC to DC converter supplies two DC to AC inverters, which in turn supply respectively the package roll drive motors and the traverse device motors, providing an interconnection permitting power feedback. Traverse motor speed varies in response to frequency changes induced by a varying control signal supplied from a signal generator to one inverter. The amount of motor-generated power fed back is optimized by adjusting the control signal amplitude and frequency, and as described more fully herein, means are provided for providing to both motor sets an appropriate voltage/frequency ratio.

Abstract: A filament winding machine having a winding spindle driven by an rpm-controllable electric drive motor, a contact roller in frictional contact with the rotating winding being formed and driven by a synchronous or an asynchronous, 3-phase electric motor and an electric control circuit responsive to deviations in the measured effective power absorption of the latter motor for maintaining a constant linear take-up velocity of the filaments onto the winding.