Asymmetric field electromagnetic motor

• US 4,843,268 A
• Filed: 09/17/1987
• Issued: 06/27/1989
• Est. Priority Date: 09/17/1987
• Status: Expired due to Fees

• Current Assignee: Marketing Systems of The South Incorporated
• Original Assignee: Marketing Systems of The South Incorporated
• Inventors: Hovorka, Jiri J.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US07/097,681
• Time in Patent Office: 649 Days
• Field of Search: 310/152, 310/261, 310/154, 310/254, 310/155, 310/112, 310/156, 310/46, 310/68 R, 310/103, 310/256, 310/114, 310/42, 310/51, 310/177, 310/181, 310/179, 310/180, 318/254, 74/573
• US Class Current: 310/181
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence

Abstract

The present invention includes an electromagnetic motor having an asymmetric field stator. An aluminum rotor 6 includes a gorup 26 of permanent magnets that occupy a 153° segment of the rotor 6 and are counterbalanced mechanically by brass counterweights 28 on the other side of the rotor 6. An aluminum stator housing 42 includes a large segment 48 of permanent magnets 54 separated by an electromagnet segment 50 from a small segment 52 of permanent magnets 54. The large segment 48 subtends an angle of 122°, the small segment 52 an angle of 22°50'"'"' and the electromagnets 43°. The permanent magnets 54 and electromagnets 56 and 58 of the staotr 42 produce a magnetic field that can have its center shifted from a first position or equator C by 32°25'"'"' to a second position or second equator C'"'"'. As the rotor 6 spins the shifting of the center of the magnet field created by the stator 42 imparts momentum to the rotor 6 as it tries to align with the stator magnetic field. The momentum carries the rotor 6 around until the field can be shifted back to its original position C. A magnetic switch 66 controls the timing of the change in the current direction in the electromagnets 56 and 58 to shift the magnetic field at angles of 87°15'"'"' and 119°40'"'"' from the nearest in segment 48.

Claims

1. A motor, comprising:

a stator assembly, including;

a first segment having permanent magnets;

a second segment being a coil segment and including an electromagnet adjacent and abutting said first segment; and

a third segment having permanent magnets adjacent and abutting said second segment, and said first through third segments occupying less than the entire circumference of said stator assembly; and

a rotor assembly rotating in said stator assembly and including a single rotor segment having permanent magnets occupying less than one-half of the circumference of the rotor assembly.

7. A motor as recited in claim 1, wherein said stator has a magnetic field center and the center is shifted by reversing a polarity of said coil segment, the center being shifted 32°

25'"'"' and a flux produced by said second segment is 2.373% of a total flux produced by said first, second and rotor segments.

2. A motor comprising:

a stator assembly, including;

a first segment having permanent magnets;

a second segment being a coil segment and including an electromagnet adjacent said first segment; and

a third segment having permanent magnets adjacent said second segment, and said first through third segments occupying less than the entire circumference of said stator assembly; and

a rotor assembly rotating in said stator assembly and including a rotor segment having permanent magnets occupying less than one-half the circumference of the rotor assembly, and said first segment subtending an angle of 122°

, said second segment an angle of 43°

, said third segment an angle of 22°

50'"'"' and said rotor segment an angle of 153°

.

3. A motor as recited in claim 2, further comprising a magnetic cycle switch connected to said electromagnet and switching the polarity of the electromagnet when the leading edge of the rotor segment rotates past said first segment in the counterclockwise direction by 87°

15'"'"' and by 119°

40'"'"', switching a center of the stator magnetic field.

4. A motor as recited in claim 3, wherein said stator assembly further comprises a flux terminator adjacent said first segment.

5. A motor as recited in claim 4, further comprising a magnetically polarized end plate.

6. A motor as recited in claim 5, further comprising a polarized magnetic flux detector on the outside of said stator assembly.

8. A motor, comprising:

first through third abutting stator assemblies offset by 120°

from each other in a direction of motor rotation, each stator assembly including;

a first segment having permanent magnets;

a second segment being a coil segment and including an electromagnet adjacent and abutting said first segment; and

a third segment of permanent magnets adjacent and abutting said second segment, and said first through third segments occupying less than the entire circumference of said stator assembly; and

first through third connector rotor assemblies, each rotor assembly including;

a rotor rotating in a respective stator assembly and including a single rotor segment having permanent magnets occupying less than one-half the circumference of the rotor assembly, thereby providing torque during a full motor rotation.