§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4270075A Expired / Lapsed US ⏱️ 0.0 years remaining

Motor energized by a DC voltage

Assignee: Danfoss AS
•
Filing: 1979-06-28
•
Granted: 1981-05-26
•
Expires: 1999-06-28
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The invention relates to a motor of the type energizable by a DC voltage and having at least two parallel stator winding branches with each branch having a stator winding in series with a controllable switching element. A demagnetization branch in parallel with each stator winding branch has an oppositely poled demagnetization winding inductively coupled to the associated stator winding and a series connected diode poled oppositely of the associated switching element. When one stator winding is switched off the voltage induced in the inductively coupled demagnetization winding produces a current which flows through the associated diode and the next simultaneously switched on stator winding. In this way the magnetic energy of the switched off stator winding is rapidly reduced and is utilized to supplement the magnetic field of the simultaneously switched on stator winding.

Inventors

  • 👤 Nils H. Nygaard

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 22:58
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 98 words
A motor of the type energized by a DC voltage, comprising, a plurality of poles and a like number of parallel subcircuits for said poles, each of said poles having operating and demagnetizing coils oppositely wound and inductively coupled, each of said subcircuits having first and second parallel arranged series circuits, each of said first series circuits including the corresponding one of said operating coils and a controllable switching element, and each of said second series circuits having only passive elements including the corresponding one of said demagnetizing coils and diode means poled oppositely of said switching element.
Claim 2
Dependent Claim 98 words
A motor of the type energized by a DC voltage, comprising, a plurality of poles and a like number of parallel subcircuits for said poles, each of said poles having operating and demagnetizing coils oppositely wound and inductively coupled, each of said subcircuits having first and second parallel arranged series circuits, each of said first series circuits including the corresponding one of said operating coils and a controllable switching element, and each of said second series circuits having only passive elements including the corresponding one of said demagnetizing coils and diode means poled oppositely of said switching element.
Claim 3
Dependent Claim 18 words
A motor according to claim 1, characterized in that said motor has three-phase windings and a squirrel-cage rotor.
Claim 4
Dependent Claim 28 words
A motor according to claim 2, characterized by a stator and stator grooves containing said stator each offset by 120° and each having two segments offset by 180°.
Claim 5
Dependent Claim 41 words
A motor according to claim 1 characterized in that said switching elements are controllable so that only one of said operating coils is energized at a time and on switching one operating coil off the next one is switched on simultaneously.
Claim 6
Dependent Claim 25 words
A motor according to claim 1 characterized in that each of said operating coils and an associated one of said demagnetization coils are double wound.
Claim 7
Dependent Claim 28 words
A motor according to claim 1 characterized in that the winding ratio between each of said operating coils and the associated one of said demagnetizing coils is 1:1.
Claim 8
Dependent Claim 24 words
A motor according to claim 1 characterized in that each said demagnetizing coils is of thinner wire than the associated one of operating coils.
Claim 9
Dependent Claim 38 words
A motor according to claim 1 characterized in that one end of each of said operating coils and one end of the associated one of said demagnetizing coils are connected to each other and to a DC terminal.

References Cited (Backward Citations)

US3684934A Cited
US3688169A Cited
US3931553A Cited
US4025859A Cited
US4081736A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-05-25 1984-11-24 1985-05-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-05-25 1988-11-24 1989-05-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-05-25 1992-11-24 1993-05-26 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag