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Class Information
Number: 310/268
Name: Electrical generator or motor structure > Dynamoelectric > Rotary > Rotor structure > Armatures > Disc
Description: Subject matter relating to disc type armatures.










Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Patent Number Title Of Patent Date Issued
4851731 Structure of a flat-type brushless DC motor Jul. 25, 1989
4847712 Disc drive spindle motor with log cogging torque Jul. 11, 1989
4839551 Brushless motor structure enabling accurate relative positioning of rotor and stator coils Jun. 13, 1989
4839552 Brushless DC motor Jun. 13, 1989
4835840 Method of making an improved disc rotor assembly Jun. 6, 1989
4837474 D.C. motor Jun. 6, 1989
4829208 Flat motor having a rotatable shaft, a stepped portion formed in said shaft, and apparatus for producing same May. 9, 1989
4827171 Single-phase synchronous motor comprising a two-pole permanent-magnetic rotor and an eddy-current intermediate rotor May. 2, 1989
4827175 Flat motor with simplified detector rotor mounting May. 2, 1989
4823040 Single-stage, two-phase of four-phase synchronous electric motor Apr. 18, 1989
4823039 Electrical machines Apr. 18, 1989
4820949 Electrically powered apparatus Apr. 11, 1989
4814654 Stator or rotor based on permanent magnet segments Mar. 21, 1989
4812696 Motor core with winding slots having reduced air gaps Mar. 14, 1989
4804574 Laminated printed coil structure Feb. 14, 1989
4803389 Stepping motor, method of driving the same and drive circuit therefor Feb. 7, 1989
4801830 Brushless motor Jan. 31, 1989
4798986 Electric generator having stationary induction coils Jan. 17, 1989
4794293 Direct current electric motor Dec. 27, 1988
4794286 Variable reluctance stepper motor Dec. 27, 1988
4794289 Bearing structures Dec. 27, 1988
4792707 Disk tracking device Dec. 20, 1988
4791332 Rotor for motor tacho-generator Dec. 13, 1988
4788464 Disc drive with integral spindle yoke Nov. 29, 1988
4782259 Frequency generator and motor with the same Nov. 1, 1988
4763403 Method of making an electronic component Aug. 16, 1988
4763037 Flat motor having a stationary magnet Aug. 9, 1988
4757222 1-phase energized disk-type brushless motor Jul. 12, 1988
4737674 Single phase brushless motor with a core Apr. 12, 1988
4737675 Brushless motor with center leads for preventing signal distortion Apr. 12, 1988
4735233 Rotary valve Apr. 5, 1988
4733115 Electric motor Mar. 22, 1988
4733120 Flat type stepping motor Mar. 22, 1988
4733119 1-Phase self-starting disk-type brushless motor with cogging-producing element Mar. 22, 1988
4725752 1-phase self starting disk-type brushless motor with cogging element Feb. 16, 1988
4724350 1-phase self starting disk-type brushless motor with cogging element Feb. 9, 1988
4719377 Armature annular core Jan. 12, 1988
4714854 Electric motor with a multipolar permanent magnet rotor Dec. 22, 1987
4710667 Brushless D.C. dynamoelectric machine with decreased magnitude of pulsations of air gap flux Dec. 1, 1987
4707645 Single-phase brushless motor Nov. 17, 1987
4704555 Improved disc rotor assembly Nov. 3, 1987
4701650 Brushless motor with phase cancelling leads for rotational speed detector pattern Oct. 20, 1987
4684839 Structure of electric motor and production method thereof Aug. 4, 1987
4682067 Synchronous electric motor having a disc-shaped permanent magnet rotor Jul. 21, 1987
4677332 Electric motor having auxiliary portions distributed at a pitch which is an odd number sub-multiple of the pitch of active portions Jun. 30, 1987
4677334 Flat coil dynamoelectric device with encapsulated preform Jun. 30, 1987
4677335 Axial gap type coreless electric motor with noise reduction Jun. 30, 1987
4672347 Multi-speed resolver using ferrite stator and rotor structures Jun. 9, 1987
4668884 Brushless motor May. 26, 1987
4667122 Tachogenerator for speed control of electric motors May. 19, 1987

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