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Permanent magnet D.C. motor having a radially-disposed working flux gap
| Details |
Inventors: Petersen, Christian C.;
Assignee:
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Lam; Thanh
Attorney, Agent or Firm: Mueller and Smith, L.P.A.
A P.M. d.c. motor which may utilize "brushless" commutation. The motor includes a stator assembly with a plurality of upstanding discrete spaced-apart core components formed in a circular locus generally parallel with the motor axis. Each core component includes a relatively lengthy winding association region and extending therefrom a pole piece region providing a flux interaction surface. A field winding mounted upon a bobbin is positioned over the core component at the winding association region and when excited, generates electromagnetic flux at the flux interaction surface. A permanent magnet component is carried by a rotor such that its interaction surface is adjacent to that at the pole piece region, and is spaced therefrom to define a flux working gap at a desirably lengthy working gap radius from the motor axis. |
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DETAILED DESCRIPTION The present invention is addressed to d.
c.
motors which may be controlled in a "brushless" manner, and produced at practical cost levels commensurate with their incorporation into products intended for the consumer marketplace.
In addition to their practical cost, the motors not only exhibit the desirable heat dissipation advantages of conventional brushless designs, but also provide improved torque output characteristics.
One factor contributing to this improved torque performance resides in a relatively high ratio of the radius from the motor axis to its working gap with respect to the corresponding radius to its outer periphery.
For example, that ratio typically is above about 0.
7 for motors between about 1 and 3 inches in diameter Excellent torque output performance is achieved even though lower cost, lower energy product permanent magnets may be employed with the motors.
Through the use of permanent magnet components having a ring configuration and a north-to-south pole magnetization oriented radially with respect to the motor axis, narrow flux working gaps become available.
These shorter gaps, when employed with the ring-shaped, radially-magnetized permanent magnet component, serve to achieve ratios of magnet thickness to radial gap length of values greater than about 3.
For motor architectures according to the invention having outside diameters of greater than about 2 inches, for example, a material savings is achieved with a stator assembly incorporating a core structure formed of multiple laminations of magnetically permeable material configured in a ring formation.
Other objects of the invention will, in part, be obvious and will, in part, appear hereinafter.
The invention, accordingly, comprises the apparatus possessing the construction, combination of elements, and arrangement of parts which are exemplified in the following detailed description.
Reference to that description and to the accompanying drawings should be had for a fuller understanding and appreciation of the nature and objects of the invention, although other objects may be obvious to those skilled in the art
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