Method and apparatus for high efficiency operation of electromechanical energy conversion devices
First Claim
1. A method for minimizing, by use of a predetermined optimizing function, the loss of power in a separately excited electromechanical energy conversion device and in a controller of said energy conversion device, said energy conversion device having n spatially fixed windings, n≧
- 1, for producing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said method comprising;
the step of first generating a command signal having a magnitude A;
the step of generating currents I1 (A), I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively;
and the step of generating currents In+1 (A), In+2 (A), . . . ,In+m (A) in said m movable windings, respectively;
wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A),In+2 (A), . . . , In+m (A) are selected in such a manner that their magnitudes as a function of said command signal having a magnitude A satisfy said predetermined optimizing function;
and wherein said predetermined optimizing function takes into account the incremental changes in said first and second magnetic fields caused by each of said n+m currents in each of said n+m windings.
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Abstract
A method and apparatus are disclosed for controlling the conversion of electrical energy to mechanical energy as well as for controlling the conversion of mechanical energy to electrical energy. In a separately excited electromechanical energy conversion system, total system power losses are minimized by simultaneously controlling the currents flowing in the different windings of the energy conversion device such that these currents are related by an optimizing function. This method and apparatus are applicable to a wide variety of electric motors and generators.
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Citations
21 Claims
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1. A method for minimizing, by use of a predetermined optimizing function, the loss of power in a separately excited electromechanical energy conversion device and in a controller of said energy conversion device, said energy conversion device having n spatially fixed windings, n≧
- 1, for producing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said method comprising;the step of first generating a command signal having a magnitude A; the step of generating currents I1 (A), I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and the step of generating currents In+1 (A), In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A),In+2 (A), . . . , In+m (A) are selected in such a manner that their magnitudes as a function of said command signal having a magnitude A satisfy said predetermined optimizing function; and wherein said predetermined optimizing function takes into account the incremental changes in said first and second magnetic fields caused by each of said n+m currents in each of said n+m windings.
- 1, for producing a first magnetic field, and having m movable windings, m≧
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2. An apparatus for minimizing, by use of a predetermined optimizing function, the loss of power in a separately excited electromechanical energy conversion device and in a controller of said energy conversion device, said energy conversion device having n spatially fixed windings, n≧
- 1, for producing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal having a magnitude A; means for generating currents I1 (A), I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A), In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A),In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal having a magnitude A satisfy said predetermined optimizing function; and wherein said predetermined optimizing function takes into account the incremental changes in said first and second magnetic fields caused by each of said n+m currents in each of said n+m windings. - View Dependent Claims (3, 4, 5, 6, 7, 8)
- 1, for producing a first magnetic field, and having m movable windings, m≧
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9. A method for minimizing, by use of an optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings, n≧
- 1, for providing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said method comprising;the step of first generating a command signal A; the step of generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and the step of generating currents In+1 (A),In+2 (A), . . . , In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . In (A),In+1 (A), In+2 (A), . . . In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said first and second magnetic fields caused by each of said n+m currents in each of said n+m windings.
- 1, for providing a first magnetic field, and having m movable windings, m≧
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10. An apparatus for minimizing, by use of an optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings, n≧
- 1, for providing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal A; means for generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A),In+2 (A), . . . , In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A), In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said first magnetic field caused by said n currents in each of said n windings.
- 1, for providing a first magnetic field, and having m movable windings, m≧
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11. An apparatus for minimizing, by use of an optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings, n≧
- 1, for providing a first magnetic field, and having m movable windings, m≅
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal A; means for generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A),In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A), In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said first magnetic field caused by said m currents in each of said m windings.
- 1, for providing a first magnetic field, and having m movable windings, m≅
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12. An apparatus for minimizing, by use of an optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings having resistance, n≧
- 1, for providing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal A; means for generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A),In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A), In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said resistance of said n windings as a function of said n currents.
- 1, for providing a first magnetic field, and having m movable windings, m≧
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13. An apparatus for minimizing, by use of an optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings, n≧
- 1, for providing a first magnetic field, and having m movable windings having resistance, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal A; means for generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A),In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A), In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said resistance of said m windings as a function of said m currents.
- 1, for providing a first magnetic field, and having m movable windings having resistance, m≧
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14. An apparatus for minimizing, by use of an optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings having resistance, n≧
- 1, for providing a first magnetic field, and having m movable windings having resistance, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal A; means for generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A),In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A), In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said resistance of said n+m windings as a function of said n+m currents.
- 1, for providing a first magnetic field, and having m movable windings having resistance, m≧
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15. An apparatus for minimizing, by use of a predetermined optimizing function, the total loss of power in a circuit having power loss components including a separately excited electromechanical energy conversion device, a controller of said energy conversion device, and a power source if said energy conversion device is a motor or a load if said energy conversion device is a generator, said energy conversion device having n spatially fixed windings, n≧
- 1, for providing a first magnetic field, and having m movable windings, m≧
1, for producing a second magnetic field which opposes said first magnetic field produced by said n spatially fixed windings, such that said first magnetic field produced by said n spatially fixed windings can be varied, at least in part, independently of said second magnetic field produced by said m movable windings, said apparatus comprising;means for first generating a command signal A; means for generating currents I1 (A),I2 (A), . . . ,In (A) in said n spatially fixed windings, respectively; and means for generating currents In+1 (A),In+2 (A), . . . ,In+m (A) in said m movable windings, respectively; wherein said currents I1 (A),I2 (A), . . . ,In (A),In+1 (A), In+2 (A), . . . ,In+m (A) are selected in such a manner that their magnitudes as a function of said command signal A satisfy said optimizing function; and wherein said optimizing function takes into account the incremental changes in said first and second magnetic fields caused by each of said n+m currents in each of said n+m windings. - View Dependent Claims (16, 17, 18, 19, 20, 21)
- 1, for providing a first magnetic field, and having m movable windings, m≧
Specification