Abstract: An electronic motor includes a shaft mounted for rotation about a rotational axis. A plurality of radial lever arms are mounted with respect to the shaft. Each lever arm has an inner end connected to the shaft by a one-way clutch. The clutches allow the shaft to rotate in only a first circumferential direction with respect to the lever arms. An electrically conductive element is attached to an outer end of each lever arm. A drive coil is positioned adjacent to each electrically conductive element. A drive circuit periodically and sequentially energizes each drive coil with current pulses. Each drive coil is oriented to produce a first pulsed magnetic field in a direction generally tangential to the circumferential direction when energized. The first magnetic field induces circulating currents within the electrically conductive element. The circulating currents in turn produce a second magnetic field about the electrically conductive element.

Abstract: An electric motor drive system having a first direct current electric motor, a first drive shaft to which the first electric motor is coupled, a second direct current electric motor having a higher power rating than the first, a second drive shaft to which the second electric motor is coupled, the second drive shaft comprising a hollow sleeve with the first drive shaft extending therethrough, an epicyclic gear system comprising a sun gear to which the first drive shaft is coupled, a ring gear to which the second drive shaft is coupled, and planetary gears meshing with both the sun gear and the ring gear, an output drive coupled to the planetary gears, and, a one way rotation restraining means coupled to the ring gear to permit rotation of the ring gear in one direction and to prevent rotation of the ring gear in the other direction.

Abstract: Apparatus and a method for controlling the operation of a fin winding machine. Various motor drives are utilized to regulate the speed of rotation of a heat exchange tube upon which fin is wrapped to regulate the speed of rotation of forming wheels for bending the fin to the appropriate configuration and to regulate the speed of rotation of slitter wheels for perforating the fin prior to bending. Sensing means are provided for determining the length of the fin strip within various segments along a fin route such that the motor speeds are all adjusted to maintain the desired amount of fin strip. Tension means are provided for maintaining constant tension of the fin strip regardless of the length of the fin strip in the appropriate segment. The various sensing means are cascaded such that a change in speed of one motor may affect a change in speed of another motor.

Abstract: An automatic motion or position control DC servomotor system in which a load-driving axis driven by a DC motor to be controlled in one rotary mechanism is rotated synchronously with, or following the rotation of, a reference axis manually operated or driven by another DC motor. The system comprises a position signal generator producing first sine- and cosine-wave signals corresponding to an angle of rotation of the controlled load-driving axis; a command signal generator producing second sine- and cosine-wave signals corresponding to an angle of rotation of the reference axis; an arithmetic unit processing the first and second sine- and cosine-wave signals and providing a sine-wave feedback voltage output signal; and a driver circuit amplifying the feedback voltage signal and providing a thus amplified signal to the DC motor driving the load-driving axis. When the reference axis is driven by another DC motor, the command signal generator may be a second position signal generator.

Abstract: An apparatus is provided for use with a motor drive for cancelling the electromagnetic reaction energies developed by a pair of drive motors upon rapid starting or sudden stopping, the latter occurring upon the application of dynamic braking to said motor drive. The apparatus comprises a pair of motors each provided with rotors preferably having moments of inertia which are substantially equal. The output shafts of the motors are operatively connected so as to rotate in opposing directions.

Abstract: The method makes possible experimentation on reduced scale models, more especially in non-stationary operating conditions, of the rotor of rotary electrical machines respecting the physical conditions which ensure in the rotor under test a simultaneous similitude for the electromagnetic, thermal and mechanical phenomena. The contradiction which appears in the reduction of the electromagnetic forces and of the inertial forces is removed by modifying the stator of the reduced scale model so as to produce in the rotor a correct evolution of the rotor frequencies. The method is useful for testing rotors of very high power electrical machines.

Abstract: A rotary drive device for effecting, for example, displacement of a printing roller towards or away from a pressure roller in a printing press, is formed by a direct current or alternating current high speed motor coupled mechanically to a permanent magnet low speed motor. Fast movement is effected with the permanent magnet motor being pulled by the high speed motor, while slow movement with rapid braking is effected, at high torque, with the permanent magnet motor excited and pulling the other motor, to bring the printing roller gently into contact with the pressure roller.

Abstract: For an automatic stitching apparatus of a type comprising at least one sewing machine having a stitching needle operable to perform a stitching operation to form an embroidery pattern on a fabric supported on an embroidery frame, a frame positioning device includes a holder for holding the frame in position relative to the stitching needle, X-axis and Y-axis drive mechanisms each including pulse responsive stepping motors mechanically connected to each other to provide an X-axis or Y-axis output drive necessary to move the frame in a predetermined direction to a given coordinate position, and first and second linkage mechanisms for transmitting the X-axis and Y-axis drives, respectively, to the frame holder. The stepping motor for each drive mechanism is connected in such a manner that the associated rotors are angularly offset from each other with respect to the axis of rotation of the rotors.

Abstract: A variable speed, alternating current motor unit which operates continuously in a stepless manner and delivers full torque over a speed range from zero to maximum speed. The unit includes two induction motors which are mounted side-by-side in a housing. Each induction motor is a polyphase, squirrel cage induction motor with a rolled shell stator wound core and an associated rotor core. The stator elements are each equipped with a double shaft extension, and the rotor elements are also each equipped with a double shaft extension. The stator elements are suitably journaled in antifriction bearings which are mounted in the housing. The rotor elements are journaled in the housing in a similar manner. The stator elements are mechanically linked by a gear train so that rotation of one stator element opposes rotation of the other stator element when both of the induction motors are energized. Consequently, the stator elements buck one another and torque is induced in the rotor elements.

Abstract: Disclosed herein is a control comprising a rotatably supported wheel, a first direct current motor, means drivingly connecting the first direct current motor to the wheel with a first drive ratio, a second direct current motor, means drivingly connecting the second direct current motor to the wheel with a second drive ratio lower than the first drive ratio, a source of direct current, and a switch electrically connected to the source of direct current and to the first and second direct current motors and including a contact arm for initially electrically connecting the direct current source to the first direct current motor whereby to drive the wheel at a slow speed, and for subsequently additionally electrically connecting the source of direct current to the second direct current motor while maintaining electrical connection of the direct current source to the first direct current motor, whereby to drive the wheel at a fast speed.

Abstract: A variable-speed three-phase drive is disclosed. The drive includes a switchable, undersynchronous converter cascade for driving two mechanically coupled asynchronous motors which have slip ring rotors and which can be connected separately to a three-phase network. The slip ring rotors of the two asynchronous motors are connected, respectively, with the three-phase terminals of different uncontrolled rectifiers. The latter two rectifiers, together with two inverters and two other rectifiers, are arranged in a ring circuit in such a manner that two rectifiers are always followed by an inverter. In accord with the invention, a switch is provided for connecting the three-phase terminals of the two rectifiers which are disposed on the respective cathode sides of the two inverters, and for also connecting the three-phase terminals of the two rectifiers which are disposed on the respective anode sides of the two inverters.

Abstract: Two electric motors are coupled to each other and to a device which is to be bi-directionally actuated. An associated electrical control circuit comprises switches and delay timers, for energizing the first motor to drive the device in one direction and concurrently drive the second unenergized motor, and then to energize the second motor to drive the device in another direction and concurrently drive the first unenergized motor.

Abstract: Disclosed is a plurality of motors mechanically connected in series so as to provide operational redundancy. The shaft of a given motor is rigidly attached to the housing of the next motor in the series, so that rotation of the first shaft will cause the second motor and its shaft to rotate. Means are provided to prevent relative rotation of the rotors of the redundant motor(s). Other means are provided to detect failure of the operating motor and to activate another motor in the series when this occurs.