Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-10-05
1996-05-28
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 49R, 310162, 310156, H02K 122, H02K 127, H02K 3716, H02K 2118
Patent
active
055214517
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a pulsed or synchronous two-phased motor comprising a rotor which incorporates thin permanent magnets having staggered poles. This type of motor further comprises several starer poles, which must be energized independently using at least two current sources related in phase, so as to cause the rotor to rotate in one direction or the other. These motors are used in many fields, and in particular in office equipment, such as printers, fax machines, photocopiers, and household appliances. In many other fields, a growing number of machines are motorized. Accordingly, motorized controls are becoming more numerous in automobiles, e.g., seat controls, heat-adjustment panels, and directional headlight settings. In consequence, increasingly stringent requirements regarding manufacturing cost-reduction of these two-phase pulsed or synchronous motors are encountered. Moreover, motors known conventionally according to prior art are normally separate components which work in conjunction with apparatuses designed independently, by means of linkage and coupling devices.
More specifically, with respect to automatic temperature control in an automobile, use is made according to prior art of automatic position control utilizing a direct-current motor incorporating a manifold, which controls the air panel by means of a train of speed-reducing gears. To allow digital control, the direct current motor is replaced by a pulsed motor. This substitution further involves the replacement of the coupling devices and often requires the integral design of the panel controls. The new motor is normally purchased from a subcontractor, which delivers a standard unit which has been assembled and tested and which incorporates, in addition to the rotor and stator, bearings and a housing and whose space requirement is not always suited to the mechanism to be controlled.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a synchronous or pulsed motor capable of being incorporated into the rest of the mechanism it controls. The motor according to the invention may, consequently, be delivered as separate components which can be assembled between two mechanism plates which, moreover, support the transmission controlling, for example, an air-conditioning panel. This type of assembly is facilitated by virtue of the fact that the motor according to the invention is a single-stage motor. The cost price of the motor according to the invention is held to a minimum because of the specification of the components, whose manufacture is economically advantageous, and because of the optimal design of the configuration of the various parts of the rotor and stator and of their assembly. In particular, the weight of the iron and copper used in the motor according to the invention is lower than in competing solutions giving identical torque and number of pitches per rotation.
The motor according to the invention comprises a first stator part working in conjunction with at least two electric coils; a second stator component which ensures at least the partial closing of the magnetic fluxes; and a rotor incorporating 2N thin magnets magnetized transversely in alternating directions, so as to create on each of its surfaces magnetic poles which are alternatively positive and negative. On each of its surfaces, the rotor comprises five pairs of poles, and the first stator component is formed from two identical stator parts possessing high magnetic permeability, each of which has two stator poles joined by a median part enclosed by a coil whose length is substantially equal to the width of the opening of the stator part.
The axis of the coils is arranged substantially in the middle plane of the magnet and of the stator components made of a soft material, which is perpendicular to the axis of rotation. Each wound stator part, along with the area of the second stator part closing off the flow, constitutes one phase of the stator of the two-phase motor. The median lines of the two poles are spaced apart by approxima
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Oudet Claude
Prudham Daniel
LaBalle Clayton E.
Moving Magnet Technologies (S.A.)
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