A rotating disc driven in synchronism with the reciprocating movement of the needle of a sewing machine has a plurality of cutaway arc-shaped sections having different arcs to produce a pulse train of frequency related to the motor speed. A photoelectrical device responds to intermittent light the interceptions being caused by the rotating disc. The pulse train comprises pulses of different pulse lengths, each corresponding to the lower and upper dead points of the needle. First and second pulse...

The disclosed system utilizes digital electronic programming to establish the rotational or translational speed of a motor driven member. The desired speed can be selected by manipulating a set of digital switches. A stable oscillator is employed to generate a high frequency signal which is processed by frequency dividers to produce a modulaton frequency signal. The modulation frequency is supplied to an optical encoder having a rotary shaft adapted to be connected to a rotary member, the speed ...

A material transfer apparatus which includes a carriage whose movement is controlled along a path between specified locations thereon. The carriage includes means for dynamically indicating its present location on the path which is compared with a specified new location to provide a difference drive for moving the carriage as required.

A combination electrical distribution and power supply unit for recreational vehicles utilizing both AC and DC circuits wherein distribution apparatus such as circuit breakers, fuses, relays and the like are housed within one chamber of the unit, while the major heat generating components, such as a power converter transformer, are housed in a separate chamber of the unit separately ventilated and cooled. The apparatus is manufactured, shipped and installed as a unit, and includes quick attachme...

A gauge and switch diaphragm protector comprising an expansion chamber mountable in a fluid conduit between the pressure source and pump switch, having sand diverting baffles mounted therein, adapted to divert sand in the fluid to the outer wall of the chamber without diminishing the pressure of the fluid.

A starting and controlling circuit for a split phase a.c. motor is disclosed. The circuit employs solid state circuitry for all high level switching and is actuatable by a low-level d.c. logic signal. The start winding and starting capacitor are switched out of the starting circuit by means of an inductor which controls the switching of a triac switch.

A means for controlling the output torque condition of a synchronous reluctance motor. The means comprises a motor control having a first signal means generating a torque command signal and a second signal means providing a rotor frequency signal. A stator winding energization means is coupled to the signal means for providing a stator current of a desired frequency and phase displacement to the motor. A power supply means is coupled to the stator winding energization means for regulating the ma...

A two-phase motor preferably of the induction or hysteresis type is driven from a variable frequency clock circuit by energizing the motor windings in phase quadrature over the frequency range. Speed control is provided by mechanically modulating a light emitting diode (LED) and photoresistor combination that couples to the clock circuit for determining its frequency of operation. The output of the clock circuit in turn couples to a two-phase generator that drives output bridges associated with ...

A marine propulsion outboard or stern drive includes a motor driven, hydraulic shift mechanism. A DC motor includes the conventional separate reverse winding and forward winding, each of which is connected individually in series with the motor armature to a battery through motor driven limit switches to stop at neutral, forward or reverse drive positions. The armature is connected to drive a valve for actuating a hydraulic shift unit. A resistor and a diode is connected in parallel between the p...

An interlocking control for a three-phase induction motor which by monitoring the voltage on the three-phase supply lines detects the presence of motor rotation and determines the direction thereof. The circuit includes operational amplifiers which monitor the voltage present on two of the three-phase supply lines with respect to the third phase, this monitored voltage being dependent upon generator action of the motor while coasting. The presence of a signal at the output of the operational amp...