Hamilton Sundstrand Corporation

Jun Hu

Vietson M Nguyen

Albert L Markunas

Waleed M Said

Charles J Romenesko

A method for detecting an initial rotor angular position and starting a dynamoelectric machine having a stator and a rotor includes the steps of driving the dynamoelectric machine into partial magnetic saturation to determine the initial rotor angular position of the dynamoelectric machine, and starting the dynamoelectric machine utilizing the initial rotor angular position previously determined.

Initial rotor position detection and start-up system for a dynamoelectric machine

A controller for a power conversion system reduces common-mode voltage generated by the power conversion system by imposing a constraint on the control signals applied to the power conversion system. The power conversion system includes a plurality of switching devices that are responsive to control signals provided by the controller to selectively connect each output of the power conversion system to one of a plurality of inputs. The controller generates control signals based on a desired output of the power conversion system. In addition, the controller imposes a constraint on the control signals to reduce the common-mode voltage. The constraint is defined by assigning an integer value to each input of the power conversion system, and requiring that the selective connection of outputs to inputs must result in a sum of integer values equal to zero.

Power conversion architecture with zero common mode voltage

A method and system for estimating an angular position and an angular velocity of a rotor in a dynamoelectric machine measures an AC current and a potential for each of a plurality of windings coupled to a stator of the dynamoelectric machine, transforms the measured currents and potentials to a stationary frame to produce transformed currents and transformed potentials, and processes the transformed currents and transformed potentials to produce a first intermediate signal and a second intermediate signal. The first intermediate signal and the second intermediate signal are cross-coupled by being processed to obtain a first extended rotor flux value and a second extended rotor flux value that are each functions of the first intermediate signal and the second intermediate signal. The first extended rotor flux value and the second extended rotor flux value are applied to a phase lock loop to derive an estimated rotor angular position and an estimated rotor angular velocity for the dynamoelectric machine.

Method and system for estimating rotor angular position and rotor angular velocity at low speeds or standstill

A shaft sensorless rotor angular position and velocity sensing system for a ynamoelectric machine that includes: a reference frame transformation function for transforming measured currents and potentials applied to a stator of the dynamoelectric machine to a two-phase &#x3b1;-&#x3b2; stationary frame to produce transformed currents I,Iand transformed potentials V,V; first and second multipliers to produce signals I*R,I*R; first and second summers to produce signals V,&#x2212;I*R,V&#x2212;I*R; first and second lag functions to produce signals third and fourth multipliers to produce signals I*L,I*L; third and fourth summers to produce signals that correspond to extended rotor flux values &#x3bb;,&#x3bb;; and a phase lock loop (PLL) to derive estimated rotor angular position and velocity values {circumflex over (&#x3b8;)}, {circumflex over (&#x3c9;)} for the dynamoelectric machine from the extended rotor flux values &#x3bb;,&#x3bb;.

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Roscoe, IL, United States of America

Jun Hu