US3906181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating apparatus for minimizing vibration and noise
Assignee: Mitsubishi Electric Corp
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Filing: 1973-06-22
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Granted: 1975-09-16
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Expires: 1993-06-22
Abstract
Abstract In an induction heating apparatus for induction heating a heated element by forming an alternating magnetic field, n groups (n > OR = 2) of magnetic circuits comprising said heated element are formed. The magnetic circuits are progressively excited by an excitation current having a phase difference in the range of SO THAT ALTERNATING COMPONENTS OF THE ELECTROMAGNETIC FORCE APPLIED TO THE HEATED ELEMENT ARE DECREASED OR REMOVED AND WHEREBY THE VIBRATION AND NOISE OF THE HEATED ELEMENT IS CONCOMITANTLY DECREASED. The present invention finds particular use with respect to an induction heating cooking apparatus run by standard line frequency current.
Inventors
- 👤 Masahiro Hibino
- 👤 Toshio Ito
- 👤 Masatami Iwamoto
- 👤 Ikuko Nomura
- 👤 Fukutaro Kishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:21
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/12; H05B6/1209; H01; H01F; H01F27/00; H01F27/24; H01F27/33; Y; Y02; Y02B; Y02B40/00; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
165 words
Induction heating appliance comprising: an exciter for induction heating a heated element, said exciter comprising, a first magnetic pole having a first excitation winding disposed adjacent to said element, a second magnetic pole having a second excitation winding disposed adjacent to said element, a third magnetic pole having a third excitation winding disposed adjacent to said element, a fourth magnetic pole having a fourth excitation winding disposed adjacent to said element, means connecting said first excitation winding to said third excitation winding to form a first circuit, means connecting said second excitation winding to said fourth excitation winding to form a second circuit, means connecting a first low frequency current to said first circuit, means connecting a second low frequency current which is substantially 90* out of phase with said first current to said second circuit, whereby a magnetic force generated by said first circuit is equal and opposite to a magnetic force generated by said second circuit in order to minimize vibration and noise.
Claim 2
Dependent Claim
165 words
Induction heating appliance comprising: an exciter for induction heating a heated element, said exciter comprising, a first magnetic pole having a first excitation winding disposed adjacent to said element, a second magnetic pole having a second excitation winding disposed adjacent to said element, a third magnetic pole having a third excitation winding disposed adjacent to said element, a fourth magnetic pole having a fourth excitation winding disposed adjacent to said element, means connecting said first excitation winding to said third excitation winding to form a first circuit, means connecting said second excitation winding to said fourth excitation winding to form a second circuit, means connecting a first low frequency current to said first circuit, means connecting a second low frequency current which is substantially 90* out of phase with said first current to said second circuit, whereby a magnetic force generated by said first circuit is equal and opposite to a magnetic force generated by said second circuit in order to minimize vibration and noise.
Claim 3
Dependent Claim
25 words
Induction heating appliance in accordance with claim 1 wherein said second current is 90* plus or minus 18* out of phase with said first current.
Claim 4
Dependent Claim
15 words
Induction heating appliance in accordance with claim 1 wherein said element comprises a cooking pot.
Claim 5
Dependent Claim
17 words
Induction heating appliance in accordance with claim 3 wherein the bottom of said cooking pot is planar.
Claim 6
Dependent Claim
34 words
Induction heating appliance in accordance with claim 1 wherein said first, second, third and fourth pOles are disposed on the same side of said element and each pole is equally spaced from adjacent poles.
Claim 7
Dependent Claim
34 words
Induction heating appliance in accordance with claim 1 wherein said first and third poles are diagonally disposed relative to each other and said second and fourth poles are diagonally disposed relative to each other.
Claim 8
Dependent Claim
22 words
Induction heating appliance in accordance with claim 1 wherein the top surfaces of said first, second, third and fourth poles are coplanar.
Claim 9
Dependent Claim
21 words
Induction heating appliance in accordance with claim 1 further including a cover plate covering said first, second, third and fourth windings.
Claim 10
Dependent Claim
17 words
Induction heating appliance in accordance with claim 8 wherein said cover plate is comprised of stainless steel.
Claim 11
Dependent Claim
246 words
Induction heating appliance comprising: an exciter for induction heating a heated element, said exciter comprising a first magnetic pole having a first excitation winding disposed adjacent to said element, a second magnetic pole having a second excitation winding disposed adjacent to said element, a third magnetic pole having a third excitation winding disposed adjacent to said element, a fourth magnetic pole having a fourth excitation winding disposed adjacent to said element, a fifth magnetic pole having a fifth excitation winding disposed adjacent to said element, a sixth magnetic pole having a sixth excitation winding disposed adjacent to said element, means connecting said first excitation winding to said fourth excitation winding to form a first circuit, means connecting said second excitation winding to said fifth excitation winding to form a second circuit, means connecting said third excitation winding to said sixth excitation winding to form a third circuit, means connecting a first low frequency current to said first circuit, means connecting a second low frequency current substantially 60* out of phase with said first current to said second circuit, means connecting a third low frequency current which is substantially 60* out of phase with said second current and which is substantially 120* out of phase with said first current to said third circuit, whereby the combination of a magnetic force generated by said first circuit and a magnetic force generated by said second circuit and a magnetic force generated by said third circuit minimizes vibration and noise.
Claim 12
Dependent Claim
246 words
Induction heating appliance comprising: an exciter for induction heating a heated element, said exciter comprising a first magnetic pole having a first excitation winding disposed adjacent to said element, a second magnetic pole having a second excitation winding disposed adjacent to said element, a third magnetic pole having a third excitation winding disposed adjacent to said element, a fourth magnetic pole having a fourth excitation winding disposed adjacent to said element, a fifth magnetic pole having a fifth excitation winding disposed adjacent to said element, a sixth magnetic pole having a sixth excitation winding disposed adjacent to said element, means connecting said first excitation winding to said fourth excitation winding to form a first circuit, means connecting said second excitation winding to said fifth excitation winding to form a second circuit, means connecting said third excitation winding to said sixth excitation winding to form a third circuit, means connecting a first low frequency current to said first circuit, means connecting a second low frequency current substantially 60* out of phase with said first current to said second circuit, means connecting a third low frequency current which is substantially 60* out of phase with said second current and which is substantially 120* out of phase with said first current to said third circuit, whereby the combination of a magnetic force generated by said first circuit and a magnetic force generated by said second circuit and a magnetic force generated by said third circuit minimizes vibration and noise.
Claim 13
Dependent Claim
41 words
Induction appliance in accordance with claim 10 wherein said second circuit is 60* plus or minus 12* out of phase with said first current and said third current is 60* plus or minus 12* out of phase with said second current.
Claim 14
Dependent Claim
15 words
Induction heating appliance in accordance with claim 10 wherein said element comprises a cooking pot.
Claim 15
Dependent Claim
17 words
Induction heating appliance in accordance with claim 12 wherein the bottom of said cooking pot is planar.
Claim 16
Dependent Claim
36 words
Induction heating appliance in accordance with claim 10 wherein said first, second, third, fourth, fifth and sixth poles are disposed on the same side of said element and each pole is equally spaced from adjacent poles.
Claim 17
Dependent Claim
47 words
Induction heating appliance in accordance with claim 10 wherein said first and fourth poles are diagonally disposed relative to each other, said third, second and fifth poles are diagonally disposed relative to each other and said third and sixth poles are diagonally disposed relative to each other.
Claim 18
Dependent Claim
24 words
Induction heating appliance in accordance with claim 10 wherein the top surfaces of said first, second, third, fourth, fifth and sixth poles are coplanar.
Claim 19
Dependent Claim
23 words
Induction heating appliance in accordance with claim 10 further including a cover plate covering said first, second, third, fourth, fifth and sixth windings.
Claim 20
Dependent Claim
17 words
Induction heating appliance in accordance with claim 17 wherein said cover plate is comprised of stainless steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |