Control for a brushless generator operable in generating and starting modes
AssigneeSundstrand Corporation
InventorsGregory I. Rozman, Albert L. Markunas, Michael J. Hanson
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Abstract
A detector for detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) having a set of armature phase windings and a main generator portion having a set of armature phase windings includes a circuit coupled to the armature phase windings of the PMG for deriving a number of interval pulses per revolution of the motive power shaft. A circuit measures time periods between adjacent interval pulses and the measured time periods are converted into an indication of the angular position of the motive power shaft in accordance with a parameter of power delivered to one of the main generator portion armature phase windings.
Claims31
A detector for detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) coupled to the shaft, the PMG having a set of armature phase windings at which a set of PMG phase outputs are produced, and a main generator portion coupled to the shaft, the main generator portion having a set of armature phase windings capable of receiving AC power, comprising:
- means coupled to the PMG armature phase windings for deriving a number of internal pulses per revolution of the motive power shaft from the PMG phase outputs;
- means coupled to the deriving means for measuring time periods between adjacent interval pulses;
- and
- means coupled to the measuring means for converting the measured time periods into an indication of the angular position of the motive power shaft.
A detector for detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) coupled to the shaft, the PMG having a set of armature phase windings at which a set of PMG phase outputs are produced, and a main generator portion coupled to the shaft, the main generator portion having a set of armature phase windings capable of receiving AC power, comprising:
- means coupled to the PMG armature phase windings for deriving a number of internal pulses per revolution of the motive power shaft from the PMG phase outputs;
- means coupled to the deriving means for measuring time periods between adjacent interval pulses;
- means coupled to the measuring means for converting the measured time periods into an indication of the angular position of the motive power shaft;
- and
- wherein the measuring means comprises a counter which accumulates clock pulses during time periods between adjacent interval pulses.
A starting system control for operating a brushless generator in a starting mode to convert electrical power into motive power wherein the brushless generator includes a motive power shaft, a permanent magnet generator (PMG) having a set of armature phase windings at which a set of PMG phase outputs are produced and a main generator portion having a set of armature phase windings which receive AC power during operation in the starting mode, comprising:
- means coupled to the PMG armature phase windings for deriving a number of interval pulses per revolution of the motive power shaft from the PMG phase outputs;
- means coupled to the deriving means for measuring time periods between adjacent interval pulses;
- means coupled to the measuring means for converting the measured time periods into indications of the speed and angular position of the motive power shaft;
- and
- means coupled to the converting means for delivering AC power to the set of main generator portion armature phase windings in dependence upon the speed and angular position indications.
A method of detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) having a set of armature phase windings at which a set of PMG phase outputs are produced and a main generator portion having a set of armature phase windings capable of receiving AC power and coupled to an exciter portion, the method comprising the steps of:
- deriving a number of interval pulses per revolution of the motive power shaft from the PMG phase outputs;
- measuring time periods between adjacent interval pulses;
- deriving a reset signal from a parameter of AC power on one of the main generator portion armature phase windings;
- and
- converting the measured time periods into an indication of the angular position of the motive power shaft in accordance with the reset signal.
Dependencies are inferred from the claim text.