초록 ▼

An electric motor incorporating an internally powered DC magnet armature. The motor includes a field winding powered from a DC source but polarity controlled to produce an advancing magnetic field. Power is delivered from a DC source to the field windings by current amplifiers. The amplifier input i

An electric motor incorporating an internally powered DC magnet armature. The motor includes a field winding powered from a DC source but polarity controlled to produce an advancing magnetic field. Power is delivered from a DC source to the field windings by current amplifiers. The amplifier input is controlled by the signals from an optical encoder sensor. The encoder sensor detects the passage of light coded segments on an optical encoder disc rotating with the armature. The relative position of the encoder sensor determines the direction of rotation. The power output of the motor is varied by a variable pulse length generator which converts the pulses from the encoder sensors into a train of pulses of variable length.

대표청구항 ▼

An electric motor comprising: a rotor body mounted for rotation on a shaft, at least one armature electro-magnet carried by said rotor body, at least one DC battery mounted within said rotor body and connected to power said armature electro-magnet to produce a fixed magnetic pole for each of said ar

An electric motor comprising: a rotor body mounted for rotation on a shaft, at least one armature electro-magnet carried by said rotor body, at least one DC battery mounted within said rotor body and connected to power said armature electro-magnet to produce a fixed magnetic pole for each of said armature electro-magnets, at least one field electro-magnet mounted in juxtaposition to the circular path of said armature electro-magnet, a source of DC power for said electro-magnet, an encoding disc on said shaft, said encoding disc having a number of encoding segments equal to twice the number of said armature electro-magnets, sensor means in association with said encoding disc for detecting the passage of alternate segments of said disc and producing a signal output corresponding to a detection of said alternate segments, said sensor means comprising a first sensor for detecting the passage of alternate segments of said encoding disc and mounted to fixed structure at a first position with respect to said encoding disc, a second sensor for detecting the passage of alternate segments of said disc mounted to fixed structure at a second position rotationally displaced around said encoding disc with respect to said first position, amplifier means connected between said sensor means and said field electro-magnet for increasing the power of pulses corresponding to signals produced by said sensor means in detecting said segments, a forward-reverse switch for selectively connecting saiD first sensor or said second sensor to said power delivery means.