Control systems and methods for permanent magnet rotating machines
DC CAFCFirst Claim
1. A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising:
- receiving a rotor torque demand; and
calculating a scaled torque demand from the received torque demand as a function of a speed of the machine to obtain a substantially constant rotor torque over a range of rotor speeds.
6 Assignments
Litigations
2 Petitions
Accused Products
Abstract
Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. A controller outputs a control signal to the drive in response to inputs of demanded torque, rotor position and/or speed. Control methods include calculating a scaled torque demand from the received torque demand to obtain substantially constant torque over a range of motor speeds, calculating an optimal dr-axis injection current using a cost function and a starting method that switches from speed control mode to torque control mode at a predetermined rotor speed or at predetermined start-up timing intervals.
75 Citations
23 Claims
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1. A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising:
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receiving a rotor torque demand; and calculating a scaled torque demand from the received torque demand as a function of a speed of the machine to obtain a substantially constant rotor torque over a range of rotor speeds. - View Dependent Claims (2, 3, 4, 5, 9, 10, 11)
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6. A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable chase windings situated therein, the method comprising:
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receiving a rotor torque demand; and calculating a scaled torque demand from the received torque demand to obtain a substantially constant rotor torque over a range of rotor speeds, including calculating the scaled torque demand such that scaled torque demand=a torque offset value+the torque demand*((torque multiplier)+a speed offset value). - View Dependent Claims (7, 8)
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12. A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising:
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calculating an IQr demand from a speed or torque demand; calculating a dr-axis injection current demand as a function of a speed of the rotor; and combining the IQr demand and the dr-axis injection current demand to produce an IQdr demand that is compensated for any torque contribution of dr-axis-current. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification