Abstract: A synchronous motor having peripheral teeth on the rotor magnetized by a permanent magnet and radially inwardly projecting, electromagnetically energized stator teeth. The rotor teeth and stator teeth are skewed relative to each other. The annular arc length subtended by the skew as projected on the cylindrical peripheral envelope of the rotor teeth equals the arc length corresponding to the angular pitch of the rotor teeth divided by an integer between two and four. Each of the rotor teeth projects upon two adjacent stator teeth, and/or each of the stator teeth projects upon two adjacent rotor teeth.

Abstract: A rotational position transducer comprising a rotor having annularly spaced teeth and a stator with a pole face configuration comprising annularly spaced teeth opposing the rotor teeth. One or more pole windings are energized by an alternate current source, and one or more output voltages induced in pole windings are produced with components having a characteristic which varies as a function of the angular position of the rotor relative to the stator. The output voltages may be either amplitude or phase modulated as a function of rotor position. The transducer may be combined with a stepping motor having an identical pole configuration.

Abstract: An improved half-wave rectifying circuit is described employing a high-gain differential amplifier including a negative feedback means for stabilizing the amplifier gain and including means for supplying an offset current and an operating bias at the amplifier input with the feedback, offset and biasing means including a number of resistors which are proportioned to provide a substantially zero output in the absence of an input signal and to provide an output which is a half-wave rectified output replica of an oscillating input.