ELECTRIC MOTOR UTILIZING A FERRITE STATOR OF LOW COERCIVENESS, FERRITE ROTOR OF HIGH COERCIVENESS, AND PHOTO-ELECTRIC COMMUTATION

• US 3,707,638 A
• Filed: 03/09/1970
• Issued: 12/26/1972
• Est. Priority Date: 03/09/1970
• Status: Expired due to Term

• Current Assignee: James C. Nailen
• Original Assignee: James C. Nailen
• Inventors: Nailen, James C.
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Budd, Mark O.
• Application Number:
  US05/017,712
• Time in Patent Office: 1,023 Days
• Field of Search: 318/138,154 310/262,156,154,49,164,152
• US Class Current: 310/152
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 29/10 using light effect devices

Abstract

An electric motor with a wound stator and a permanent magnet rotor, wherein optical commutation is combined with a ferrite stator core to provide improved high speed capability and efficiency, long life, and utility in any atmosphere. A novel pole format of six poles or multiple thereof combined with electronic pulsing gives the motor a stepping capability enabling it to follow incremental tape storage, computer, or master-slave commands, as well as providing further torque and speed potential. Optional use of a ferrite rotor provides extreme longevity to the motor.

Claims

1. An electric motor which comprises operatively associated stator and rotor elements each having magnetic core means that includes six pole members or a multiple thereof in substantially circularly arranged, regularly spaced relationship, said stator and rotor pole members being in opposed driving relationship for imparting torque to said rotor, said stator element core means being composed of a ferrite material of low coerciveness and having a winding on each of its said pole members, and said rotor element core means comprising a ferrite material of high coerciveness that is permanently magnetized and substantially encapsulated in plastic, and electrical pulse input means electrically connected to said windings and adapted to furnish pulses of alternating electrical polarity to said windings, said pulse input means comprising a light commutator for pulsing said stator windings in synchronism with rotor movement, said light commutator comprising a stationary commutator portion including a generally stationary light source and photoelectric means, and a rotor commutator portion comprising a light chopper operatively disposed between said light source and said photoelectric means, said commutator portions being operatively associated in a mechanically separated, generally frictionless relationship.