PATENT CLAIM ANALYSIS

Application Number: 15748926
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2019-01
Patent Classification: ["318", "400020"]

Abstract:
The invention proposes a fault-tolerant field-oriented control method of five-phase interior permanent-magnet fault-tolerant linear motor (IPM-FTLM) with two nonadjacent short-circuit phase faults. Firstly, the extended Clark transformation matrix can be obtained according to the principle that magnetic motive force (MMF) keeps constant before and after the two-phase open-circuit faults, the constraint that the sum of healthy phase currents is zero and the adjacent two-phase current amplitude is equal. The back electric motive force (EMF) can be estimated by the transposed matrix. The nonlinear strong coupling system becomes the first-order inertia system when using the internal mode controller, the first-order inertia feed-forward voltage compensator and back-EMF observer, as the motor is with fault. Then, according to the principle that the sum of MMF of the healthy phase short-circuit compensation currents and two phases short-circuit fault currents is zero, the short-circuit compensation voltage can be obtained, and then these voltages add vector-controller output voltages, respectively. The invention not only restrains the thrust force fluctuation caused by two nonadjacent short-circuit phase faults, but also more importantly keeps the same dynamic and steady performance as the normal conditions, and also it has the constant switching frequency of voltage source inverter.

Claim (Index 4):
The fault-tolerant field-oriented control method of five-phase IPM-FTLM with two nonadjacent short-circuit phase faults of  claim 6  wherein Step 6 further comprises:\n (6.1) in this invention, the phase inductance is almost constant L s ; After the motor phase voltages subtract the back-EMFs, the model with phase-B and phase-E short-circuit faults in natural frame can be expressed as follows: \n \u2003 { u Ae = u A - e A = Ri A + L s \ue89e di A dt - e B = Ri B + L s \ue89e di B dt u Ce = u C - e C = Ri C + L s \ue89e di C dt u De = u D - e D = Ri D + L s \ue89e di D dt - e E = Ri E + L s \ue89e di E dt where u A , u C , and u D  are the healthy phase voltages, e A , e B , e C , e D  and e E  are the phase back-EMF; u Ae , u Ce  and u De  are the values of the healthy phase voltages subtracting phase back-EMFs, respectively, and R is phase resistance;\n (6.2) the healthy phase currents are handled according to the Step 5; then the model of two nonadjacent short-circuit phase faults in the natural frame is transformed into model in the synchronous rotating frame by using the extended Clark transformation matrix T post  and Park transformation matrix C 2s/2r ; and \n { u de = i d \ue89e R + L s \ue89e di d dt - \u03c9 \ue89e \ue89e L s \ue89e i q u qe = i q \ue89e R + L s \ue89e di q dt + \u03c9 \ue89e \ue89e L s \ue89e i d . (6.3) by using magnetic co-energy and transformation matrix T post , C 2s/2r , and C 2r/2s , when the motor is with two nonadjacent short-circuit phase faults, the thrust force equation can be obtained as: F = 2.5 \ue89e \u03c0 \u03c4 \ue89e i q \ue89e \u03bb m where \u03bb m  is permanent magnet linkage.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 86.0
- Lexical Diversity: 1.87931
- Patent Class: 318.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15741629', '12720366', '14797940', '13859304', '12838442']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6590400134729274
- 35 USC 102 Novelty (BERT): 0.519285592357817
- Combined Prediction Score: 0.6450645713614164
- Mean Citation Score: 235.027966
- Max Citation Score: 273.48117
- Similarity Product: 174.70333179233555

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test