US6552509B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and a device for sensorless estimating the relative angular position between the stator and rotor of a three-phase synchronous motor
Assignee: Electroproject BV
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Filing: 2001-05-10
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Granted: 2003-04-22
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Expires: 2021-05-10
Abstract
Abstract A method for sensorless estimation of the relative position between the stator and the rotor of a three-phase synchronous motor during operation. The method comprises the steps of low-pass filtering of the terminal voltage, low-pass filtering of the terminal current, high-pass filtering of the terminal current and determining the rotor speed. Next the relative angular position is determined from the filtered magnitudes and corrected with an angular correction derived from the rotor speed.
Inventors
- 👤 Andre Veltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:36
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/006; H02P6/14; H02P6/16; H02P6/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
109 words
A method for sensorless estimation during operation of a three-phase synchronous motor, comprising a stator, having a stator winding comprising terminals for connecting terminal voltage and terminal current, and a magnetic rotor, of the relative position between said stator and said rotor, said method comprising the steps of: low pass-filtering the terminal voltage; low-pass filtering the terminal current; high-pass filtering the terminal current; determining a rotor speed of the magnetic rotor; and determining the relative angular position from the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current, and correcting the determined relative angular position with angular correction derived from said rotor speed.
Claim 2
Independent Claim
109 words
A method for sensorless estimation during operation of a three-phase synchronous motor, comprising a stator, having a stator winding comprising terminals for connecting terminal voltage and terminal current, and a magnetic rotor, of the relative position between said stator and said rotor, said method comprising the steps of: low pass-filtering the terminal voltage; low-pass filtering the terminal current; high-pass filtering the terminal current; determining a rotor speed of the magnetic rotor; and determining the relative angular position from the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current, and correcting the determined relative angular position with angular correction derived from said rotor speed.
Claim 3
Dependent Claim
54 words
A method according to claim 1 , further comprising the steps of supplying said stator winding with electric energy by a pulse width modulator and determining a stator winding impedance, for use in the step of determining said relative angular position, from a modulator-induced switching ripple in the terminal voltage and the terminal current.
Claim 4
Dependent Claim
39 words
A method according to claim 2 , further comprising the step of determining said stator winding impedance from a modulator-induced switching ripple in the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current.
Claim 5
Dependent Claim
53 words
A method according to claim 3 , further comprising the steps of determining said switching ripple by removing a fundamental component by band-pass filtering after transforming the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current to a system of coordinates that is synchronous to said rotor.
Claim 6
Dependent Claim
50 words
A method according to claim 4 , wherein said step of transformation to said system of coordinates that is synchronous to said rotor comprises the steps of rotating the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current through said determined relative angular position.
Claim 7
Dependent Claim
52 words
A method according to claim 5 , further comprising the step of deriving an estimate of an instantaneous stator winding impedance, comprising an instantaneous resistance portion and an instantaneous inductivity portion, from said switching ripple of the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current.
Claim 8
Dependent Claim
56 words
A method according to claim 6 , further comprising the step of estimating said instantaneous inductivity portion from a quotient of a low-pass filtered dot-product of the switching ripple of the low-pass filtered terminal voltage and the high-pass filtered terminal current, and a low-pass filtered dot-product of the switching ripple in the high-pass filtered terminal current.
Claim 9
Dependent Claim
56 words
A method according to claim 6 , further comprising the step of estimating said instantaneous resistance portion from a quotient of a low-pass filtered dot-product of the switching ripple in the low-pass filtered terminal voltage and the high-pass filtered terminal current, and a low-pass filtered dot-product of the switching ripple in the low-pass filtered terminal current.
Claim 10
Dependent Claim
38 words
A method according to claim 7 , further comprising the step of determining said quotient from the dot-products and continuous averages of the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current.
Claim 11
Dependent Claim
38 words
A method according to claim 8 , further comprising the step of determining said quotient from the dot-products and continuous averages of the low-pass filtered terminal voltage, the low-pass filtered terminal current, and the high-pass filtered terminal current.
Claim 12
Dependent Claim
26 words
A method according to claim 6 , further comprising the step of assuming a fixed value for said instantaneous resistance portion of said stator winding impedance.
Claim 13
Dependent Claim
52 words
A method according to claim 2 , further comprising the steps of interrupting said electric energy that is supplied to said stator winding by said pulse width modulator near standstill of said rotor, and estimating said relative angular position from said stator terminal voltage measured during said interruption of said electric energy.
Claim 14
Dependent Claim
62 words
A method according to claim 12 , further comprising the steps of alternatively switching said pulse width modulator to a condition of high impedance wherein no electric energy is supplied to said stator winding, and to an active condition for supplying electric energy to said stator winding, and measuring said terminal voltage during said high-impedance condition for estimating said relative angular position.
Claim 15
Dependent Claim
35 words
A method according to claim 1 , further comprising the step of removing high-frequency noise from said determined relative angular position by means of non-delayed low-pass filtering in accordance with a Phase Locked Loop structure.
Claim 16
Dependent Claim
47 words
A method according to claim 1 , further comprising the step of correcting said determined angular position for at least one of asymmetries in the three-phase synchronous motor; induced voltage effects at near-standstill of the rotor and near full-speed of the rotor; and 5 th harmonic disturbances.
Claim 17
Dependent Claim
10 words
A device for performing said method of claim 1 .
Claim 18
Dependent Claim
12 words
A three-phase synchronous motor comprising a device according to claim 16 .
References Cited (Backward Citations)
US4763058A
Cited
US5585709A
Cited
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