Electrical generator or motor structure – Dynamoelectric – Oscillating
Patent
1974-12-19
1976-05-25
Envall, Jr., R. N.
Electrical generator or motor structure
Dynamoelectric
Oscillating
178 76, 318686, 318127, 350 6, H02K 3100
Patent
active
039596737
ABSTRACT:
According to one feature a bearing-free oscillation motor, e.g. for driving an optical scanner or chopper comprises a torsion shaft fixed at one end for rotational oscillation about its axis, a rotor support member substantially more rigid in bending than the torsion shaft attached to the free end of the shaft and extending back therealong, a magnetically interactive rotor rigidly joined to the support member at the midlength of the torsion shaft, and a magnetically interactive stator adjacent the rotor for inducing rotational oscillation of the rotor, the torsion shaft and the rotor support member cooperating to provide a stiff system in bending. Preferably the rotor torsion shaft and rotor support member assembly are cooperatively constructed to restrain the rotor, in response to radial forces acting on it, to substantially translational motion without tilting of the rotor or the attached mirror or other device. According to another feature a torsion-shaft mounted rotor is divided into angularly spaced pole faces which, by vectorial combination effects, result in more uniform and decreased force on the rotor if the rotor is deflected from its desired position. According to another feature of the invention in such general type of oscillation motor a rotor motion pick-off coil has a predetermined stationary position aligned on the plane of symmetry bisecting the drive coil so as to be magnetically substantially symmetrical, regardless of rotor position, with the magnetic field effects that are inherently produced by the drive coil as it drives the rotor. Preferably this pick-up system has its modulated flux provided by stray flux from permanent magnets which bias the drive rotor.
REFERENCES:
patent: 3343012 (1967-09-01), Scott
patent: 3624574 (1971-11-01), Montagu
Envall, Jr. R. N.
General Scanning Inc.
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