US6630809B2
Expired / Lapsed
US
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System and method for induction motor control
Assignee: Vitesco Technologies USA LLC
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Filing: 2001-11-29
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Granted: 2003-10-07
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Expires: 2021-11-29
Abstract
Abstract Field oriented induction motor system including a field oriented induction motor having an associated torque current and an associated flux current and a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current, and wherein the predetermined current ratio is dependent upon the saturation state of the motor. A method for selecting the ratio of torque current to flux current for a field oriented induction motor including applying an allocation factor to the torque current and flux current, wherein the allocation factor is dependent upon the saturation state of the motor. The saturation state of the motor is determined based upon motor parameters.
Inventors
- 👤 Li Chen
- 👤 Xingyi Xu
- 👤 Vinod Reddy
- 👤 Richard Joseph Hampo
- 👤 Kerry Eden Grand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:33
CPC Classifications
H; H02; H02P; H02P21/00; H02P21/22
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
72 words
A field oriented induction motor system, comprising: a field oriented induction motor having an associated torque current and an associated flux current; and a torque-flux current ratio controller that substantially maintains a ratio of torque current to flux current by use of a first relationship when the induction motor is in a substantially nonsaturated state, and by use of a second relationship when the induction motor is in a substantially saturated state.
Claim 2
Dependent Claim
72 words
A field oriented induction motor system, comprising: a field oriented induction motor having an associated torque current and an associated flux current; and a torque-flux current ratio controller that substantially maintains a ratio of torque current to flux current by use of a first relationship when the induction motor is in a substantially nonsaturated state, and by use of a second relationship when the induction motor is in a substantially saturated state.
Claim 3
Dependent Claim
33 words
The field oriented induction motor system of claim 1 , wherein the first relationship comprises: a relationship between the torque current and flux current defined by the equation i qs =i ds .
Claim 4
Dependent Claim
45 words
The field oriented induction motor system of claim 1 , wherein the second relationship comprises: a relationship between the torque current and flux current defined by the equation i qs =K i ds , where K is a variable having a value greater than 1.
Claim 5
Dependent Claim
105 words
A field oriented induction motor having an associated torque current and an associated flux current, the field oriented induction motor comprising: a torque-flux current ratio controller that provides a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current; and wherein the predetermined current ratio is dependent upon the saturation state of the motor such that (a) the motor has a first predetermined current ratio when the motor is in a nonsaturated state, and (b) the motor has a second predetermined current ratio when the motor is in at least a partially saturated state.
Claim 6
Dependent Claim
105 words
A field oriented induction motor having an associated torque current and an associated flux current, the field oriented induction motor comprising: a torque-flux current ratio controller that provides a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current; and wherein the predetermined current ratio is dependent upon the saturation state of the motor such that (a) the motor has a first predetermined current ratio when the motor is in a nonsaturated state, and (b) the motor has a second predetermined current ratio when the motor is in at least a partially saturated state.
Claim 7
Dependent Claim
31 words
The field oriented induction motor of claim 4 , wherein the first predetermined current ratio is 1:1, and wherein the current ratio is expressed as: i qs i ds = 1.
Claim 8
Dependent Claim
39 words
The field oriented induction motor of claim 4 , wherein the second predetermined current ratio is determined according to the equation: i qs i ds = K , where K is a variable having a value greater than 1.
Claim 9
Dependent Claim
22 words
The field oriented induction motor of claim 6 , wherein K is dependent upon the mutual, or magnetizing, inductance of the motor.
Claim 10
Dependent Claim
21 words
The field oriented induction motor of claim 6 , wherein K is expressed as: K = L mNonSaturated L mSaturated .
Claim 11
Dependent Claim
22 words
The field oriented induction motor of claim 4 , wherein the saturation state of the motor is determined based upon motor parameters.
Claim 12
Independent Claim
83 words
A method for selecting the ratio of torque current to flux current for a field oriented induction motor, the method comprising applying an allocation factor to the torque current and flux current, wherein the allocation factor is dependent upon the saturation state of the motor, such that (a) the motor applies a first allocation factor when the motor is in a nonsaturated state, and (b) the motor applies a second allocation factor when the motor is in at least a partially saturated state.
Claim 13
Independent Claim
83 words
A method for selecting the ratio of torque current to flux current for a field oriented induction motor, the method comprising applying an allocation factor to the torque current and flux current, wherein the allocation factor is dependent upon the saturation state of the motor, such that (a) the motor applies a first allocation factor when the motor is in a nonsaturated state, and (b) the motor applies a second allocation factor when the motor is in at least a partially saturated state.
Claim 14
Dependent Claim
32 words
The method of claim 10 , wherein the torque current is equal to the flux current multiplied by the allocation factor, as expressed by the following equation: i qs =Ki ds .
Claim 15
Dependent Claim
21 words
The method of claim 11 , wherein the allocation factor is dependent upon the mutual, or magnetizing, inductance of the motor.
Claim 16
Dependent Claim
23 words
The method of claim 12 , wherein the allocation factor is expressed by the following equation: K = L mNonSaturated L mSaturated .
Claim 17
Dependent Claim
19 words
The method of claim 10 , further comprising determining the saturation state of the motor based upon motor parameters.
Claim 18
Independent Claim
104 words
A method for selecting the ratio of torque current to flux current for a field oriented induction motor, the method comprising: receiving the saturation state of the motor, wherein the saturation state of the motor determined based upon motor parameters; and applying an allocation factor to the torque current and the flux current, wherein the allocation factor is dependent upon the saturation state of the motor, such that (a) the motor applies a first allocation factor when the motor is in a nonsaturated state, and (b) the motor applies a second allocation factor when the motor is in at least a partially saturated state.
Claim 19
Independent Claim
104 words
A method for selecting the ratio of torque current to flux current for a field oriented induction motor, the method comprising: receiving the saturation state of the motor, wherein the saturation state of the motor determined based upon motor parameters; and applying an allocation factor to the torque current and the flux current, wherein the allocation factor is dependent upon the saturation state of the motor, such that (a) the motor applies a first allocation factor when the motor is in a nonsaturated state, and (b) the motor applies a second allocation factor when the motor is in at least a partially saturated state.
Claim 20
Dependent Claim
14 words
The method of claim 15 , wherein the motor is in a nonsaturated state.
Claim 21
Dependent Claim
26 words
The method of claim 16 , wherein the torque current is equal to the flux current, as expressed by the following equation: i qs =i ds.
Claim 22
Dependent Claim
14 words
The method of claim 15 , wherein the motor is in a saturated state.
Claim 23
Dependent Claim
28 words
The method of claim 18 , wherein the torque current is related to the flux current according to following the equation: i qs i ds = K .
Claim 24
Dependent Claim
21 words
The method of claim 19 , wherein the allocation factor is dependent upon the mutual, or magnetizing, inductance of the motor.
Claim 25
Dependent Claim
23 words
The method of claim 20 , wherein the allocation factor is expressed by the following equation: K = L mNonSaturated L mSaturated .
Claim 26
Dependent Claim
107 words
A field oriented induction motor system, comprising: a field oriented induction motor having an associated torque current and an associated flux current; and a torque-flux current ratio controller that provides a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current, and wherein the predetermined current ratio is dependent upon the saturation state of the motor such that (a) the motor has a first predetermined current ratio when the motor is in a nonsaturated state, and (b) the motor has a second predetermined current ratio when the motor is in at least a partially saturated state.
Claim 27
Dependent Claim
107 words
A field oriented induction motor system, comprising: a field oriented induction motor having an associated torque current and an associated flux current; and a torque-flux current ratio controller that provides a predetermined current ratio, wherein the predetermined current ratio is defined as the ratio of the torque current to the flux current, and wherein the predetermined current ratio is dependent upon the saturation state of the motor such that (a) the motor has a first predetermined current ratio when the motor is in a nonsaturated state, and (b) the motor has a second predetermined current ratio when the motor is in at least a partially saturated state.
Claim 28
Dependent Claim
32 words
The field oriented induction motor system of claim 22 , wherein the first predetermined current ratio is 1:1, and wherein the current ratio is expressed as: i qs i ds = 1.
Claim 29
Dependent Claim
40 words
The field oriented induction motor system of claim 22 , wherein the second predetermined current ratio is determined according to the equation: i qs i ds = K , where K is a variable having a value greater than 1.
Claim 30
Dependent Claim
23 words
The field oriented induction motor system of claim 24 , wherein K is dependent upon the mutual, or magnetizing, inductance of the motor.
Claim 31
Dependent Claim
22 words
The field oriented induction motor system of claim 24 , wherein K is expressed as: K = L mNonSaturated L mSaturated .
Claim 32
Dependent Claim
23 words
The field oriented induction motor system of claim 22 , wherein the saturation state of the motor is determined based upon motor parameters.
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