US4354145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically commutating motor
Assignee: US Philips Corp
•
Filing: 1980-11-17
•
Granted: 1982-10-12
•
Expires: 2000-11-17
Abstract
Abstract An electric machine with electronic commutation includes two Hall elements arranged at an angular spacing about the rotor axis smaller than the phase difference φ required between the energizing signals in order to obtain a correct energization of the motor. The energizing circuit for the stator coils is provided with a combining circuit for linearly combining the signals obtained from the Hall elements in order to obtain signals with a phase difference equal to φ.
Inventors
- 👤 Johannes H. H. Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:42
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
An electric machine having electronic commutation comprising, a rotor which at least partly comprises a permanent magnetic material, which rotor co-operates with at least two stationarily arranged stator coils, at least two magneto-sensitive Hall elements arranged on a common substrate for supplying signals which vary substantially sinusoidally with the rotor position in order to energize the stator coils as a function of the rotor position via an energizing circuit, the magneto-sensitive elements being arranged at angular spacings around the rotor axis which are smaller than the phase difference φ which is necessary between the energizing signals for the stator coils in order to obtain a correct energization of said stator coils, and the energizing circuit includes a combining circuit for linearly combining the signals supplied by the at least two magneto-sensitive elements so as to obtain at least two energizing signals having a mutual phase difference which is substantially equal to φ.
Claim 2
Dependent Claim
152 words
An electric machine having electronic commutation comprising, a rotor which at least partly comprises a permanent magnetic material, which rotor co-operates with at least two stationarily arranged stator coils, at least two magneto-sensitive Hall elements arranged on a common substrate for supplying signals which vary substantially sinusoidally with the rotor position in order to energize the stator coils as a function of the rotor position via an energizing circuit, the magneto-sensitive elements being arranged at angular spacings around the rotor axis which are smaller than the phase difference φ which is necessary between the energizing signals for the stator coils in order to obtain a correct energization of said stator coils, and the energizing circuit includes a combining circuit for linearly combining the signals supplied by the at least two magneto-sensitive elements so as to obtain at least two energizing signals having a mutual phase difference which is substantially equal to φ.
Claim 3
Dependent Claim
58 words
An electric machine as claimed in claim 1, adapted as a two-phase or a four-phase machine, characterized in that the combining circuit supplies a signal which is proportional to the sum of the signals supplied by the two magneto-sensitive elements and a signal which is proportional to the difference of the signals supplied by the two magneto-sensitive elements.
Claim 4
Dependent Claim
80 words
An electric machine as claimed in claim 1, wherein the combining circuit supplies a first signal C, which satisfies the equation C=A+KB, and a second signal D, which satisfies the equation D=A-KB, where A is the signal supplied by a first one of the magneto-sensitive elements, B is the signal supplied by a second one of the magneto-sensitive elements, and K is a predetermined constant such that the phase difference between the signals C and D is equal to φ.
Claim 5
Dependent Claim
80 words
An electric machine as claimed in claim 1, wherein the combining circuit supplies a first signal C, which satisfies the equation C=A-KB and a second signal D, which satisfies the equation D=B-KA, where A is the signal supplied by a first one of the magneto-sensitive elements, B is the signal supplied by a second one of the magneto-sensitive elements, and K is a predetermined constant such that the phase difference between the signals C and D is equal to φ.
Claim 6
Dependent Claim
156 words
An electric machine as claimed in claim 4, wherein the energizing circuit comprises a first comparator having a first input connected to a first one of the magneto-sensitive elements and and output connected to the series connection of a first one of the stator coils and a first resistor, means connecting a second input of the first comparator to a junction between said first stator coil and said first resistor, a second comparator having a first input connected to a second one of the magneto-sensitive elements and an output connected to the series connection of a second one of the stator coils and a second resistor, means connecting a second input of the second comparator to a junction between the second stator coil and said second resistor, and a third resistor included between the junction of the first stator coil and the first resistor and the junction of the second stator coil and the second resistor.
Claim 7
Dependent Claim
18 words
An electric machine as claimed in claim 5, characterized in that the third resistor is a variable resistor.
Claim 8
Dependent Claim
74 words
An electric machine as claimed in claim 3, 4, 5 or 6 wherein the machine is a three-phase machine having three stator coils and the combining circuit is adapted to supply signals with an electrical phase difference of 60° to a first one and second one of said stator coils and that the third one of said stator coils is connected between the first and second stator coils to form a delta connection thereof.
Claim 9
Dependent Claim
34 words
An electric machine as claimed in any one of claims 1 to 6, characterized in that the energizing circuit is at least partly incorporated in an integrated circuit together with the two magneto-sensitive elements.
Claim 10
Dependent Claim
48 words
An electric machine as claimed in claims 3 or 4 wherein the combining circuit includes means for supplying a third signal E that satisfies the equation E=-(C+D) and K has a value such that the signals C, D and E have a mutual phase difference φ of 120°.
Claim 11
Dependent Claim
38 words
An electric machine as claimed in claims 3 or 4 wherein the angular spacing between said two magneto-sensitive elements is α and K is a constant factor which depends on the angle α and the phase difference φ.
Claim 12
Dependent Claim
113 words
An electric machine as claimed in claim 1 wherein the combining circuit includes first, second and third amplifiers having gain factors of G, G, and (K-1)G, respectively, and said two magneto-sensitive elements are each coupled to said first, second and third amplifiers so as to yield three output signals G(A-KB), G(B-KA) and G(K-1)(A+B), respectively, where A and B are the signals supplied by a first and a second one of said magneto-sensitive elements, and K is a constant such as to produce a mutual phase difference φ of 120° between said three output signals, and means for coupling said three output signals respectively to three stator coils of a three phase electric machine.
References Cited (Backward Citations)
US4135120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |