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US3891879A Expired / Lapsed US ⏱️ 0.0 years remaining

Rotor for a hysteresis motor

Assignee: Mitsubishi Steel Mfg Co Ltd
•
Filing: 1974-06-25
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Granted: 1975-06-24
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Expires: 1994-06-25
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Abstract

Abstract A rotor for a hysteresis motor comprises a laminated core having a cage winding, a sheet-like flexible plastic magnetic material secured to the outer periphery of said core without being magnetized, and a filler adhesive secured to the outer surface of said plastic magnetic material, said plastic magnetic material being anisotropic in the direction of the sheet thickness and having such magnetic properties as not less than 2.2 KG residual magnetic flux density Br, not less than 1.2KOe coercive force BHC, not less than 1.1 MGOe maximum magnetic energy product (BH)max and not greater than 4 KOe minimum intensity of magnetic field necessary for saturation, said plastic magnetic material further having a knee point in its hysteresis loop located in the second quadrant of the B-H diagram, and said filler adhesive being a mixture of powders of a material having high magnetic permeability and a synthetic resin. Alternatively a hollow cylindrical core with a cage winding may be disposed outside a cylindrical core with the interposition of the sheet-like flexible plastic magnetic material having the same magnetic properties.

Inventors

  • 👤 Keiko Yamada
  • 👤 Kimiyuki Kamino
  • 👤 Toshiro Kubota

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 15:37
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/04; H02K19/08

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 166 words
A ROTOR FOR A HYSTERESIS MOTOR COMPRISING A CYLINDRICAL LAMINATED CORE OF SILICON STEEL PLATES HAVING A CAGE WINDING, A SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL SECURED TO THE OUTER PERIPHERY OF SAID CORE WITHOUT BEING MAGNETIZED AND A COATING OF A FILLER ADHESIVE FIXEDLY SECURED TO THE OUTER PERIPHERY OF SAID SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL, SAID SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL BEING ANISOTROPIC IN THE THICKNESS DIRECTION OF THE SHEET AND HAVING SUCH MAGNETIC PROPERTIES AS NOT LESS THAN 2.2 KG RESIDUAL MAGNETIC FLUX DENSITY BR, NOT LESS THAN 1.2 KOE COERCIVE FORCE BHC AND NOT LESS THAN 1.1 MGOE MAXIMUM MAGNETIC ENERGY PRODUCT (BH)MAX AND NOT GREATER THAN 4 KOE MINIMUM INTENSITY OF MAGNETIC FIELD NECESSARY FOR SATURATION HS, SAID SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL FURTHER HAVING A KNEE POINT IN ITS HYSTERESIS LOOP LOCATED IN THE SECOND QUADRANT OF THE B-H DIAGRAM, SAID COATING OF A FILLER ADHESIVE COMPRISING THE POWDERS OF MATERIALS HAVING HIGH MAGNETIC PERMEABILITY SUCH AS IRON, AND SYNTHETIC RESINS.
Claim 2
Dependent Claim 166 words
A ROTOR FOR A HYSTERESIS MOTOR COMPRISING A CYLINDRICAL LAMINATED CORE OF SILICON STEEL PLATES HAVING A CAGE WINDING, A SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL SECURED TO THE OUTER PERIPHERY OF SAID CORE WITHOUT BEING MAGNETIZED AND A COATING OF A FILLER ADHESIVE FIXEDLY SECURED TO THE OUTER PERIPHERY OF SAID SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL, SAID SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL BEING ANISOTROPIC IN THE THICKNESS DIRECTION OF THE SHEET AND HAVING SUCH MAGNETIC PROPERTIES AS NOT LESS THAN 2.2 KG RESIDUAL MAGNETIC FLUX DENSITY BR, NOT LESS THAN 1.2 KOE COERCIVE FORCE BHC AND NOT LESS THAN 1.1 MGOE MAXIMUM MAGNETIC ENERGY PRODUCT (BH)MAX AND NOT GREATER THAN 4 KOE MINIMUM INTENSITY OF MAGNETIC FIELD NECESSARY FOR SATURATION HS, SAID SHEET-LIKE FLEXIBLE PLASTIC MAGNETIC MATERIAL FURTHER HAVING A KNEE POINT IN ITS HYSTERESIS LOOP LOCATED IN THE SECOND QUADRANT OF THE B-H DIAGRAM, SAID COATING OF A FILLER ADHESIVE COMPRISING THE POWDERS OF MATERIALS HAVING HIGH MAGNETIC PERMEABILITY SUCH AS IRON, AND SYNTHETIC RESINS.
Claim 3
Dependent Claim 148 words
A rotor for a hysteresis motor comprising a cylindrical laminated core of silicon steel plates, a sheet-like flexible plastic magnetic material secured to the outer periphery of said core without being magnetized and a hollow cylindrical laminated core of silicon steel plates fixedly secured to the outer periphery of said sheet-like flexible plastic magnetic material with a cage winding, said sheet-like flexible plastic magnetic material being anisotropic in the thickness direction of the sheet and having such magnetic properties as not less than 1.2 KG residual magnetic flux density Br, not less than 1.2 KOe coercive force BHC and not less than 1.1 MGOe maximum magnetic energy product (BH)max and not greater than 4 KOe minimum intensity of magnetic field necessary for saturation HS, said sheet-like flexible plastic magnetic material further having a knee point in its hysteresis loop located in the second quadrant of the B-H diagram.
Claim 4
Dependent Claim 148 words
A rotor for a hysteresis motor comprising a cylindrical laminated core of silicon steel plates, a sheet-like flexible plastic magnetic material secured to the outer periphery of said core without being magnetized and a hollow cylindrical laminated core of silicon steel plates fixedly secured to the outer periphery of said sheet-like flexible plastic magnetic material with a cage winding, said sheet-like flexible plastic magnetic material being anisotropic in the thickness direction of the sheet and having such magnetic properties as not less than 1.2 KG residual magnetic flux density Br, not less than 1.2 KOe coercive force BHC and not less than 1.1 MGOe maximum magnetic energy product (BH)max and not greater than 4 KOe minimum intensity of magnetic field necessary for saturation HS, said sheet-like flexible plastic magnetic material further having a knee point in its hysteresis loop located in the second quadrant of the B-H diagram.

References Cited (Backward Citations)

US2468295A Cited
US2834895A Cited
US3024392A Cited
US3231770A Cited
US3317766A Cited
US3524092A Cited
US3539845A Cited
US3561833A Cited
US3728786A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-06-23 1978-12-23 1979-06-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-06-23 1982-12-23 1983-06-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-06-23 1986-12-23 1987-06-24 $7700.00 Window Closed / Lapsed

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