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Halbach array DC motor/generator

Patent ·
OSTI ID:871313
 [1];  [1];  [2]
  1. Livermore, CA
  2. Walnut Creek, CA
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A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are winding losses and losses due to bearings and windage. An "inside-out" design is used as compared to a conventional motor/generator design. The rotating portion, i.e., the rotor, is on the outside of the machine. The stationary portion, i.e., the stator, is formed by the inside of the machine. The rotor contains an array of permanent magnets that provide a uniform field. The windings of the motor are placed in or on the stator. The stator windings are then "switched" or "commutated" to provide a DC motor/generator much the same as in a conventional DC motor. The commutation can be performed by mechanical means using brushes or by electronic means using switching circuits. The invention is useful in electric vehicles and adjustable speed DC drives.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
Regents of University of California (Oakland, CA)
Patent Number(s):
US 5705902
OSTI ID:
871313
Country of Publication:
United States
Language:
English

References (3)

Design of permanent multipole magnets with oriented rare earth cobalt material journal February 1980
Physical and optical properties of rare earth cobalt magnets journal August 1981
Application of permanent magnets in accelerators and electron storage rings (invited) journal April 1985

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