Electrical machine, especially a three-phase generator
AssigneeRobert Bosch GmbH
InventorKlaus Beulich
Life of this patent
Estimating the term…
Abstract
The electrical machine, especially a three-phase generator, has a stationary stator (21); a rotatable rotor having an excitation coil (28), a rotary transformer (29) having a primary winding (30) and a secondary winding (31) on respective soft ferrite cores and magnetically coupled with each other via an air gap (38) and a control circuit (40) for loading the primary winding (30) of the rotary transformer (29) with an alternating current. The control circuit (40) includes an input-side current limiting circuit (46), whereby an integrated temperature control is obtained in cooperation with the soft ferrite cores of the primary and secondary windings according to the Curie effect.
Claims6
An electrical machine comprising
- a stationary stator (21);
- a rotatable rotor having an excitation coil (28),
- a rotary transformer (29) having a primary winding (30) and a secondary winding (31), said primary winding and said secondary winding being arranged on respective cores (35, 36) consisting of soft ferrite material and magnetically coupled with each other via an air gap (38);
- and
- a control circuit (40) for loading the primary winding (30) of the rotary transformer (29) with an alternating current, said control circuit (40) including an input-side current limiting circuit (46);
- whereby an integrated temperature control is obtained in cooperation with the soft ferrite material of the respective cores according to the Curie effect.
Dependencies are inferred from the claim text.