Abstract: A twin radial air gap permanent-magnet-on-rotor brushless motor with a rotor comprising two magnet rings and a stator comprising individual iron-core-based stator pole modules containing a wound stator pole element with outward facing and inward facing radial pole surfaces, co-planar with the two magnet rings across the twin radial motor operating air gaps. Pole modules are mounted in a circular array upon an insulating surface or printed circuit board in automatic assembly operations interconnecting field coil windings in the desired pattern and including other electrical control components, with pole modules centered on the motor rotation axis and predominantly enclosed by the rotor. Field coil windings are supported by insulating bobbins located around the radial extent of the stator pole elements between the outer and inner facing radial pole surfaces with electrical means for connection to the electrical interconnection function supplied with the insulating surface or circuit board.

Abstract: A vertical stator d.c. PM motor employs outer and inner working air gaps wherein the length of the inner working gap at any stator pole is greater than the corresponding length at the outer working gap. A mutual cancellation of detent torque between the outer and inner working gaps is promoted through an offsetting of the rotor magnetic regions.

Abstract: A multi-phase unipolar motor is configured such that each stator pole is formed with bifilar wound primary and inductively associated secondary windings corresponding with one phase. The primary winding at one stator pole corresponding with one phase is coupled with a secondary winding at another stator pole corresponding with another phase to provide a commutational-step defined winding pair. The resultant winding pair assemblage is energized in correspondence with a commutational sequence such that collapsing field energy may be transferred from a primary winding at the termination of one step in the commutational sequence to the secondary winding associated with it in a next succeeding commutational step.

Abstract: System, method and apparatus for commutating a multiphase motor utilizing a single sensor. Commutation is carried out by employing a sensible system which incorporates phase commutating transition attributes. A motor is started by assigning a starting phase for a given direction of motor direction. An aligning phase initially is energized to orient the rotor so as to provide adequate starting phase start-up torque. Following such alignment and start-up, the motor is operated in response to transitions of the sensible system. In one aspect, a reference phase attribute may be incorporated in the sensible system to provide a mandated reference phase energization when the rotor is oriented for reference phase activation. Further described is a sensible system magnetic region configuration which is combined with a single package Hall effect sensor to provide three-phase unipolar and four-phase commutation with absolute phase defining information.

Abstract: Electrodynamic apparatus such as a motor, generator or alternator is configured having a stator core assembly formed of pressure shaped processed ferromagnetic particles which are pressure molded in the form of stator modules. These generally identical stator modules are paired with or without intermediate modules to provide the stator core structure for receiving field winding components. In one embodiment, two sets of the paired stator modules are combined in tandem to enhance operational functions without substantial diametric increases in the overall apparatus.

Abstract: System, method and apparatus for commutating a multiphase motor utilizing a single sensor. Commutation is carried out by employing a sensible system which incorporates phase commutating transition attributes. A motor is started by assigning a starting phase for a given direction of motor direction. An aligning phase initially is energized to orient the rotor so as to provide adequate starting phase start-up torque. Following such alignment and start-up, the motor is operated in response to transitions of the sensible system. In one aspect, a reference phase attribute may be incorporated in the sensible system to provide a mandated reference phase energization when the rotor is oriented for reference phase activation. Further described is a sensible system magnetic region configuration which is combined with a single package Hall effect sensor to provide three-phase unipolar and four-phase commutation with absolute phase defining information.

Abstract: Method and apparatus for forming an electrodynamic device such as a motor or generator. The device is formed with an encapsulation structure which is developed by insert molding. A rigid pressed powder stator core and stator backiron subassembly with associated stator core windings is formed. This subassembly is the insert for an insert molding procedure developing an encapsulation structure which mechanically supports the stator structure; provides mechanical support and improved heat dissipation and incorporates integrally formed bearing mounts. With the procedure, substantially lower device costs are realized.

Abstract: A d.c. PM motor and corresponding generator having a stator core assembly which is formed of a pressure-shaped processed ferromagnetic particulate material. The spaced apart isotropic core components of the stator core assembly are generally disposed in parallel relationship with the motor axis or generator axis, having a flux interaction region with a flux interaction surface located adjacent the confronting magnetic surface of a rotor and being generally coextensive with the principal dimension thereof to form an air gap. Each core component includes a winding region extending generally in parallel relationship with the device axis a field winding length to a ring-shaped back iron region. The back iron region interconnects the core components in magnetic field exchange relationship. Field windings are mounted over the core components in connection with supporting bobbins.

Abstract: A d.c. PM motor and corresponding generator having a stator core assembly which is formed of a molded or pressure shaped processed ferromagnetic particulate material. The low permeability characteristic of this material is accommodated for by a stator shape which optimizes the efficiency of the coupling of the PM field of a rotor into the stator structure. Efficiency for coupling the applied field into the stator core structure also is enhanced through the utilization of transitions in levels between the induction region of each core component and the field winding support region. A method is described for assembling the stator core assemblies using discrete core component pieces in conjunction with back iron linking components or pieces.

Abstract: A d.c. PM motor and corresponding generator having a stator core assembly which is formed of a pressure-shaped processed ferromagnetic particulate material. The spaced apart isotropic core components of the stator core assembly are generally disposed in parallel relationship with the motor axis or generator axis, having a flux interaction region with a flux interaction surface located adjacent the confronting magnetic surface of a rotor and being generally coextensive with the principal dimension thereof to form an air gap. Each core component includes a winding region extending generally in parallel relationship with the device axis a field winding length to a ring-shaped back iron region. The back iron region interconnects the core components in magnetic field exchange relationship. Field windings are mounted over the core components in connection with supporting bobbins.

Abstract: A d.c. PM motor having a stator core assembly which is formed of a pressure shaped processed ferromagnetic particulate material. The low permeability characteristic of this material is accommodated for by a stator shape which optimizes the efficiency of the coupling of the PM field of a rotor into the stator structure. Efficiency for coupling the applied field into the stator core structure also is enhanced through the utilization of transitions in levels between the induction region of each core component and the field winding support region. A method is described for assembling the stator core assemblies using discrete core component pieces in conjunction with back iron linking components or pieces.