High efficiency DC motor with generator and flywheel characteristics

• US 5,514,923 A
• Filed: 09/28/1993
• Issued: 05/07/1996
• Est. Priority Date: 05/03/1990
• Status: Expired due to Fees

• Current Assignee: Eugene R. Murray, Scott E. Gossler
• Original Assignee: Eugene R. Murray, Scott E. Gossler
• Inventors: Murray, Eugene R., Gossler, Scott E.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): HASZKO, DENNIS
• Application Number:
  US08/127,471
• Time in Patent Office: 952 Days
• Field of Search: 310/68 R, 310/68 B, 310/68 C, 310/68 D, 310/74, 310/152, 310/153, 310/156, 310/184, 310/185, 310/259, 310/268, 310/266, 310/113, 310/114
• US Class Current: 310/74
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 7/02 Additional mass for increasing inertia, e.g. flywheels
• CPC Class Codes: H02P 6/14 Electronic commutators
• CPC Class Codes: Y02E 60/16 Mechanical energy storage, e.g. flywheels or pressurised fluids
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A high efficiency multi-phasic type DC motor incorporating brushless electronic switching to phase the attractive and repulsive forces between the permanent magnets in the rotor and wire wound air core coils in the stator. The unequal number of magnets and coils provides a designed imbalance, so that proper energization induces rotation and torque in the motor'"'"'s dual flywheel rotor. Electronic switching collects inductive kickback and back emf simultaneously during the motor phase and in addition, disconnects the attraction and repulsion phases during regenerative braking, etc. and directs all this generated power back to the power pack where it is stored in batteries and capacitors. The rechargeable batteries and capacitors in the power pack are the source of operating electrical power for the motor. The rotating assembly is designed to have adequate mass so that the kinetic energy of rotation smooths out the pulsing moments introduced by the attraction and repulsion of the coils and magnets and to ensure continuous rotation of the dual flywheel rotor. The combination of electronic switching, the low hysteresis loss in the air core coils, the streamlined configuration of the rotor which reduces windage loss and the recovery of the generated currents in the air core coils contribute to the high efficiency of the electric DC motor.

Claims

1. A high efficiency, high torque multiphase direct current machine which operates simultaneously in a motor-mode, in a generator-mode, and in a flywheel-mode comprising:

an inner stator disk, with one or more air core coils mounted equidistant apart in a periphery of said stator disk and positioned so that said air core coils are energized in equilaterally balanced groups;

a pair of outer rotor disks disposed parallel to and aligned with one another;

said stator disk and said rotor disks being made of strong lightweight plastic structural materials;

a fixed central shaft coupled to said rotor disks and passing through said stator disk, where said shaft is sandwiched in a fixed position between said rotor disks;

a plurality of permanent magnets arranged in two paired sets, said magnets of each one set are mounted equidistant apart in a periphery of each one rotor disk, with each pair in polar alignment and poles of each pair reversed in every other pair;

a generated current sensor and a generated voltage sensor for use in generator-mode;

a current consumption sensor and a voltage consumption sensor for use in motor-mode;

a rotor position sensor;

a switching means for controlling power to said coils;

a feedback controlled rectifying means to recover and control generated energy;

a rechargeable power pack including electronically controlled rectifying devices, driver electronics, a capacitor bank, and rechargeable batteries, where said machine concomitantly in generator-mode utilizes inductive kickback, back-emf, and regenerative braking to recharge said power pack; and

,

a microprocessor controlling electronic commutation and operation of said machine by utilizing data derived from said sensors.

2. The multiphase machine as claimed in claim 1, wherein said machine includes one or more phases, and wherein some of said one or more phases are selected to operate in said motor-mode while simultaneously the other of said one or more phases are selected to operate in said generator-mode, and said permanent magnets in said rotor disk periphery combine to produce a flywheel rotor mass which provides kinetic energy to said machine in said flywheel-mode.

3. The multiphase machine as claimed in claim 2, wherein said one or more phases of said machine comprises five separate phases incorporated into five groups of three said air core coils each, for a total of fifteen coils, where said total of fifteen coils are mounted equidistant apart on said periphery of said stator disk in five equilaterally positioned groups of three.

4. The multiphase machine as claimed in claim 1, wherein said air core coils include cores with no magnetic material contained therein, and said cores produce little or no hysterysis or eddy currents.

5. The multiphase machine as claimed in claim 1, wherein said plurality of permanent magnets in said rotor disks comprises twenty-four neodymium magnets in twelve pairs, where said twelve pairs are mounted in polar alignment and equidistant apart in said peripheries of said rotor disks with north and south poles reversed in every other pair.