US6008614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor with permanent magnets and motor system
Assignee: Honda Motor Co Ltd
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Filing: 1996-09-18
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Granted: 1999-12-28
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Expires: 2016-09-18
Abstract
Abstract In a motor with permanent magnets and a motor system, the value α produced by dividing, by the induced voltage constant ke, the product of the inductance Lm of the motor itself or the inductance Ls of the motor system in the d-q coordinate system is selected to meet a predetermined condition. The range of rotational speeds in which the motor can be operated while maintaining a predetermined output under field weakening control can be widened. If a condition is established to determine a ratio by which the rated rotational speed under normal operating conditions is multiplied into a rotational speed under field weakening control, then conditions for a motor or a motor system that can be used can be determined.
Inventors
- 👤 Nobuyuki Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:06
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/06; H02P25/00; H02P25/02; H02P25/022; H02P25/03
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
87 words
A synchronous motor optimized for running under equivalent field weakening control, having a rotor comprising permanent magnets; an inductance La which is determined by an equation (a), where Ip is a rated current, Ke is an induced voltage constant in a d/q-axis conversion system of the synchronous motor, and α is in a range represented by an inequality (b): ##EQU16## where k is a ratio by which a rated rotational speed can be multiplied to a rotational speed for operation without reducing motor output below rated output.
Claim 2
Dependent Claim
87 words
A synchronous motor optimized for running under equivalent field weakening control, having a rotor comprising permanent magnets; an inductance La which is determined by an equation (a), where Ip is a rated current, Ke is an induced voltage constant in a d/q-axis conversion system of the synchronous motor, and α is in a range represented by an inequality (b): ##EQU16## where k is a ratio by which a rated rotational speed can be multiplied to a rotational speed for operation without reducing motor output below rated output.
Claim 3
Dependent Claim
18 words
A synchronous motor according to claim 1, wherein said value α represented by the equation (a) is 1.
Claim 4
Dependent Claim
105 words
A motor system optimized for running under equivalent field weakening control, comprising a synchronous motor having a rotor comprising permanent magnets; and a driver circuit for driving the synchronous motor, the motor system having an inductance Ls which is determined by an equation (c), where Ip is a rated current, Ke is an induced voltage constant in a d/q-axis conversion system of the motor system, and α is in a range represented by an inequality (d): ##EQU17## where k is a ratio by which a rated rotational speed can be multiplied to a rotational speed for operation without reducing motor output below a rated output.
Claim 5
Dependent Claim
105 words
A motor system optimized for running under equivalent field weakening control, comprising a synchronous motor having a rotor comprising permanent magnets; and a driver circuit for driving the synchronous motor, the motor system having an inductance Ls which is determined by an equation (c), where Ip is a rated current, Ke is an induced voltage constant in a d/q-axis conversion system of the motor system, and α is in a range represented by an inequality (d): ##EQU17## where k is a ratio by which a rated rotational speed can be multiplied to a rotational speed for operation without reducing motor output below a rated output.
Claim 6
Dependent Claim
18 words
A motor system according to claim 3, wherein said value α represented by the equation (c) is 1.
Claim 7
Dependent Claim
27 words
A motor system according to claim 3, further including correcting inductances connected to windings of the synchronous motor for making the inductance Ls satisfy the equation (c).
Claim 8
Dependent Claim
22 words
A motor system according to claim 5, wherein the correcting inductances are connected in series to the windings of the synchronous motor.
Claim 9
Dependent Claim
22 words
A motor system according to claim 5, wherein the correcting inductances are connected in parallel to the windings of the synchronous motor.
Claim 10
Independent Claim
83 words
A method of configuring a synchronous motor having a rated speed and rated output to operate at a speed higher than the rated speed, comprising the steps of selecting the synchronous motor with permanent magnets to have an inductance La, a rated current Ip, and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor; adjusting the inductance La such that the inductance La, the rated current Ip, and the induced voltage constant Ke remain in proportion of La·Ip=Ke.
Claim 11
Independent Claim
83 words
A method of configuring a synchronous motor having a rated speed and rated output to operate at a speed higher than the rated speed, comprising the steps of selecting the synchronous motor with permanent magnets to have an inductance La, a rated current Ip, and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor; adjusting the inductance La such that the inductance La, the rated current Ip, and the induced voltage constant Ke remain in proportion of La·Ip=Ke.
Claim 12
Dependent Claim
32 words
A method according to claim 8 further comprising operating the synchronous motor at a speed up to √2 times higher than the rated speed without reducing motor output below the rated output.
Claim 13
Dependent Claim
108 words
A synchronous motor optimized for running under equivalent field weakening control, comprising: a stator comprising armature windings; a rotor comprising permanent magnets; correcting inductances connected to the armature windings; a driver circuit for driving the synchronous motor; and the synchronous motor having a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor characterized in that the motor has an inductance La which falls in a range represented by an inequality (c): ##EQU18## where k is a ratio by which a rated rotational speed can be multiplied to a rotational speed for operation without reducing motor output below rated output.
Claim 14
Dependent Claim
108 words
A synchronous motor optimized for running under equivalent field weakening control, comprising: a stator comprising armature windings; a rotor comprising permanent magnets; correcting inductances connected to the armature windings; a driver circuit for driving the synchronous motor; and the synchronous motor having a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor characterized in that the motor has an inductance La which falls in a range represented by an inequality (c): ##EQU18## where k is a ratio by which a rated rotational speed can be multiplied to a rotational speed for operation without reducing motor output below rated output.
Claim 15
Dependent Claim
72 words
A synchronous motor optimized for running under field weakening control, comprising: a stator comprising armature windings; a rotor comprising permanent magnets; correcting inductances connected to the armature windings; a driver circuit for driving the synchronous motor; and the synchronous motor having a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor characterized in that the motor has an inductance La equal to Ke/Ip.
Claim 16
Dependent Claim
72 words
A synchronous motor optimized for running under field weakening control, comprising: a stator comprising armature windings; a rotor comprising permanent magnets; correcting inductances connected to the armature windings; a driver circuit for driving the synchronous motor; and the synchronous motor having a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor characterized in that the motor has an inductance La equal to Ke/Ip.
Claim 17
Dependent Claim
107 words
For a synchronous motor have windings, a method for configuring the synchronous motor to run under equivalent field weakening control at a rotational speed which is higher than rated speed, comprising the steps of selecting the synchronous motor having a rotor with permanent magnets with a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor; choosing a rotational speed to run the motor which is a factor k times higher than the rated speed; adjusting inductance La of the motor windings such that the inductance La falls in a range represented by an inequality in equation (c): ##EQU19##
Claim 18
Dependent Claim
107 words
For a synchronous motor have windings, a method for configuring the synchronous motor to run under equivalent field weakening control at a rotational speed which is higher than rated speed, comprising the steps of selecting the synchronous motor having a rotor with permanent magnets with a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor; choosing a rotational speed to run the motor which is a factor k times higher than the rated speed; adjusting inductance La of the motor windings such that the inductance La falls in a range represented by an inequality in equation (c): ##EQU19##
Claim 19
Dependent Claim
27 words
A method according to claim 10 further comprising operating the synchronous motor at a speed higher than the rated speed without reducing motor output below rated output.
Claim 20
Dependent Claim
32 words
A method according to claim 13 further comprising operating the synchronous motor at a speed up to √2 times higher than the rated speed without reducing motor output below the rated output.
Claim 21
Dependent Claim
15 words
A method according to claim 10 further comprising adjusting the inductance La to equal Ke/Ip.
Claim 22
Dependent Claim
81 words
For a permanent magnet synchronous motor having permanent magnets and windings, a method for optimizing the motor for running under equivalent field weakening control at a rotational speed which is higher than rated speed, comprising the steps of identifying a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system for the synchronous motor; adding correcting inductances to the windings of the synchronous motor to set a total inductance Ls of the synchronous motor equal to Ke/Ip.
Claim 23
Dependent Claim
81 words
For a permanent magnet synchronous motor having permanent magnets and windings, a method for optimizing the motor for running under equivalent field weakening control at a rotational speed which is higher than rated speed, comprising the steps of identifying a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system for the synchronous motor; adding correcting inductances to the windings of the synchronous motor to set a total inductance Ls of the synchronous motor equal to Ke/Ip.
Claim 24
Dependent Claim
32 words
A method according to claim 16 further comprising operating the synchronous motor at a speed up to √2 times higher than the rated speed Ip without reducing motor output below rated output.
Claim 25
Dependent Claim
21 words
A method according to claim 16 further comprising connecting the correcting inductances in series to the windings of the synchronous motor.
Claim 26
Dependent Claim
86 words
A synchronous motor system adapted to be optimized for running under equivalent field weakening control at a rotational speed which is higher than rated speed, comprising: a stator comprising armature windings; a rotor comprising permanent magnets; a driver circuit for driving the synchronous motor, the synchronous motor having a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor; correcting inductances connected to the armature windings for modifying total inductance Ls of the motor system equal to Ke/Ip.
Claim 27
Dependent Claim
86 words
A synchronous motor system adapted to be optimized for running under equivalent field weakening control at a rotational speed which is higher than rated speed, comprising: a stator comprising armature windings; a rotor comprising permanent magnets; a driver circuit for driving the synchronous motor, the synchronous motor having a rated current Ip and an induced voltage constant Ke in a d/q-axis conversion system of the synchronous motor; correcting inductances connected to the armature windings for modifying total inductance Ls of the motor system equal to Ke/Ip.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-27 | 2003-06-28 | 2003-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-27 | 2007-06-28 | 2007-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-27 | 2011-06-28 | 2011-12-28 | $7700.00 | Window Closed / Lapsed |