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| Number | Title | Issue Date |
| 7440689 | Electromagnetically actuated adjusting apparatus for lens An electromagnetically actuated adjusting apparatus for lens is disclosed. The adjusting apparatus comprises a body capable of furnishing a lens inside, at least one permanent magnet, a first magnetic conductor and a second magnetic conductor. The first and the seco... | 10/21/2008 |
| 7045983 | System for controlling motor speed by altering magnetic field of the motor The present invention provides a system for controlling the speed of a motor by altering the magnetic field of the motor. The system includes field modification module, and a motor having field windings and a rotor. The field windings are configured to receive a dri... | 05/16/2006 |
| 6927518 | Direct current machine having continuously arranged magnetic poles When one of armature coils is in a beginning of a commutation process, a center line of a trailing end tooth of a corresponding group of teeth, around which the one of the armature coils is wound, is generally aligned with a corresponding boundary between magnets. W... | 08/09/2005 |
| 4899074 | Permanent magnet rotary dynamo electric machines A rotary dynamo electric machine comprising a stator, a rotor rotatable relative to the stator and having an air gap between the rotor and the stator. The permanent magnet poles of the machine each include a two part flux shunt formed from a material of h... | 02/06/1990 |
| 4639625 | Direct-current machine having permanent magnet field system A direct-current machine having a rotor which includes a commutator, an armature core and an armature winding and is sustained rotatably in a field system constituted by a cylindrical housing and permanent magnets disposed inside the same. A demagnetizing... | 01/27/1987 |
| 4587449 | Permanent magnet rotary dynamo electric machine A permanent magnet rotary dynamo electric machine wherein each permanent magnet pole is equipped with a flux shunt which provides a direct flux path between the airgap at the strong tip region of the pole and the iron circuit upon which the pole is suppor... | 05/06/1986 |
| 4471252 | Rotary dynamo electric machine with protection against demagnetization of low flux portion of permanent magnet poles A permanent magnet dynamo electric machine is provided with a shield of high saturation flux density at the weaker or lower flux tip or edge of a permanent magnet pole face to prevent both circumferential and axial demagnetization of that portion of the p... | 09/11/1984 |
