摘要:
An inrush restraint in a fault indicator disables trip in response to the current in the cable being monitored changing from reset to trip values within a predetermined period.
摘要:
In the disclosed system, recurring signals, such as from a watt-hour meter or other type of meter, are registered, by sensing the signals, converting the signals to mechanical motions, and applying them to a mechanical register so that the register accumulates the motions sensed by the amplifier and indicates a value representative of the accumulated total of the signals. According to one embodiment of the invention, a sensor senses the signals formed by gaps in the rotating disc of a watt-hour meter and an amplifier drives a stepping motor on the basis of the signals. The stepping motor advances an odometer whose non-volatile output can be read visually or scanned electronically over a telephone line.
摘要:
In the disclosed system, the stator of a motor is provided with a plurality of radially directed stator poles, each having stator teeth arranged in a circle around an axis, and includes permanently magnetized rotor teeth facing the poles. The number of poles on the stator is sixteen at regular intervals of 221/2 degrees, each having teeth offset from the teeth on the poles 90 degrees therefrom by one full pitch and offset from the teeth on adjacent poles by one-quarter pitch. According to an embodiment, the coils are energized digitally to move the rotor at one-half, one-quarter, one-eighth, one-sixteenth, and one-thirty second steps. According to another embodiment, the poles are spaced and shaped to permit large preformed windings to be mounted thereon.
摘要:
The rotor structure of a synchronous inductor motor, such as a stepping motor, is of a compact, low-inertia and high-magnetic efficiency construction wherein a relatively thin axiallymagnetized annular washer is fixed intermediate the wholly planar end surfaces of relatively lightweight back-to-back cup-shaped pole pieces and extends radially from a relatively large central shaft fully to the roots of the pole-piece teeth.
摘要:
Two or more reed switches project through a single magnetic body. Winding means surround the reed switches to make them alternately pick up and drop out. The flux of the magnetized body latches the switches in the conductive state and, when the switch is made to drop out, allows it to remain in the non-conductive state.