 Interior permanent magnet synchronous motor |
| The present invention has been made in view of the foregoing disadvantage of the prior art. A... |
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| Electric machine with integrated power electronics |
| Referring now to FIG. 1, an electric machine 10 is illustrated in a circumference mount ... |
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| Brushless motor for partable electronic equipment with wire treatment technique of coils |
| Thus, the present invention has an object to provide a wire treatment technique which can make ... |
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| Spindle motor |
| A primary object of the invention is to provide a spindle motor which makes it possible to prevent ... |
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| Lanced strip and edgewise wound core |
| Among the several objects of the present invention may be noted the provision of an improved ... |
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| Axial flux reluctance machine with two stators driving a rotor |
| The present invention concerns an axial flux reluctance machine and methods for operating such a ... |
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| Axial bolt-in cage stator frame assembly and method for assembling a stator |
| The invention is embodied in a stator cage design that allows parallel manufacturing of the stator ... |
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| Methods of making an electric motor and thrust bearing assembly for same |
| This invention relates generally to bearing assemblies and, more particularly, to thrust bearing ... |
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| Apparatus for reusing hangers with size indicia |
| OF THE INVENTION Referring now in detail to the drawings, and to the embodiments depicted in FIGS. ... |
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| Reluctance-type motor having widened bottom |
| It is therefore an object of the present invention to provide a reluctance-type motor that has less ... |
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Method and apparatus for control of a switched reluctance motor
| Details |
Inventors: Taylor, David G.; Rehman, Saeed Ur;
Assignee: Georgia Tech Research Corp. (Atlanta, GA)
Primary Examiner: Martin; David
Assistant Examiner:
Attorney, Agent or Firm: Deveau, Colton & Marquis
A method for estimating and controlling the rotor position of a SRM comprises the steps of sampling phase currents and estimating phase fluxes from at least one excited phase of the SRM, sampling phase currents and estimating phase inductances from at least one unexcited phase of the SRM, and estimating the rotor position by determining a rotor position that is common to the estimated phase flux and the estimated phase inductance solutions to predetermining flux and inductance models. The estimation of rotor position can be less sensitive to measurement noise by applying a least squares technique. Once the rotor position has been estimated by the above method, the position of the rotor can be controlled so as to provide an overall effective control of the SRM. In particular, once the position of the rotor is estimated, the excitation provided to the motor is then adjusted to urge the rotor from its current position, velocity or torque toward a desired position, velocity or torque. |
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DETAILED DESCRIPTION In the preferred form, the present invention comprises a method and apparatus for estimating the rotor position of a SRM.
The estimated rotor position can then be used in a closed loop SRM position or velocity control as the actual position of the rotor.
The method generally comprises the steps of sampling the phase currents and voltages of the SRM, estimating the phase flux for at least one excited phase of the SRM from the phase currents and voltages, estimating the phase inductance for at least one unexcited phase of the SRM from the phase currents and voltages, estimating the indicated rotor position domain from the estimated phase flux, estimating the indicated rotor position domain from the estimated phase inductance, and resolving the ambiguity in rotor position obtained from the indicated phase flux domain and the indicated phase inductance domain.
In the implementation shown, the ambiguity in the dual positions provided by the phase flux estimate on the one hand, and the dual positions provided by the phase inductance estimate on the other hand, is resolved effectively by determining which rotor position domain is unambiguously common to both estimates.
This is accomplished according to the invention in a facile manner by using piecewise representations of the motor characteristics of phase flux and phase inductance.
Each piecewise representation (one for phase flux as a function of phase current and rotor position and one for phase inductance as a function of phase current and rotor position), forming a surface in 3-dimensional space, is divided into a number of rectangular regions or domains which are assigned unique domain indicators.
By choosing the common region where the domain indicators match, the ambiguity in rotor position is resolved.
A unique rotor position estimate can then be reported as the common position calculated from the phase flux function and phase inductance function in the common domain using least squares data fitting.
According to one feature of the invention, the step of estimating the phase flux of at least one excited phase includes sampling the phase voltage and phase current, and taking an integration of the sampled phase voltage and phase current to obtain a phase flux estimate
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Generators or Motors 
