Wide air gap permanent magnet motors

Electrical generator or motor structure – Dynamoelectric – Rotary

Patent

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Details

Other Related Categories

310154, 310181, H02K 2112

Type

Patent

Status

active

Patent number

044450613

Description

ABSTRACT:
A rotating electric machine with a permanent magnet rotor, provided with a stator composed of a winding and a ferrite structure to provide low power losses and improved efficiency particularly at high rotor revolution rates, is constructed so as to optimize the performance of the permanent magnets on the rotor. In the preferred embodiment of the invention, the ferrite being selected for its low hysteresis and eddy current power losses, generically referred to as core loss and its low loss factor which are frequency dependent, replaces laminated electrical iron. Additionally the permanent magnets selected to exhibit high intrinsic magnetic intensity and low remanent magnetic flux density, are arranged in conjunction with the ferrite to maximize the magnet's energy product as well as the magnetic circuit gap length, which in combination provides a radical improvement in machine energy density.

REFERENCES:
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patent: 3360668 (1967-12-01), Faulhaber
patent: 3657583 (1972-04-01), Tamaru
patent: 3731533 (1973-05-01), Geery
patent: 4019075 (1977-04-01), Kagami
patent: 4080540 (1978-03-01), Karube
patent: 4130769 (1978-12-01), Karube
patent: 4135107 (1979-01-01), Kamerbeck et al.
Schuisky, Application of Permanent Magnets in Electrical Machines, Elektrotechniek, vol. 52, No. 6, pp. 326-332, 1974.
Siemens, Introducing a New Concept in Miniature D.C. Motors, Bulletin: 1AD, 6.
Kamerbeek, On the Theoretical and Experimental Determination of the Electric Torque in Electric Machines, Phillips Research Reports, Supplement No. 4, 1970.
Kamerbeek, Scaling Laws for Electric Motors, Philips Technical Review, vol. 35, No. 4, pp. 116-123, 1975.
Kamerbeek, Torque Measurements on Induction Motors using Hall Generators or Measuring Windings, Philips Technical Review, vol. 34, No. 7, pp. 153-162, 1974.
Kamerbeek, Electric Motors, Philips Technical Review, vol. 33, No. 89, pp. 215-234, 1973.
Wentworth and Ellis, Permanent Magnets II--Stabilization Prediction for Permanent Magnet Field Motors and Generators, Journal of Applied Physics, vol. 37, No. 3, pp. 1143-1146, 1966.
Ireland, New Figure of Merit for Ceramic Permanent Magnet Material Intended for DC Motor Applications, Jour. of App. Physics, vol. 38, No. 3, pp. 1011-1012, 1967
Lakerveld, High Speed Solid Rotor Induction Motors, Philips Technical Review, vol. 34, No. 7, pp. 170-179, 1974.

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