Turntide Technologies Inc.

Software Motor Company

Illinois Institute of Technology

Other

Tokyo Institute of Technology

Piyush C Desai

Mark A Johnston

Mahesh Krishnamurthy

Trevor A Creary

Timothy Knodel

Ali Emadi

Bryan Dale Knodel

Akira Chiba

Tim Knodel

Fernando Rodriguez

Earl Fairall

Jihad Furqani

Candra Adi Wiguna

A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter.

Method and apparatus for quasi-sensorless adaptive control of switched reluctance motor drives

An SR drive with an acoustic noise reduction system for reducing vibration and acoustic noise in a switched reluctance motor (SRM). The vibration and acoustic noise at specific harmonics of current excitation in SRM are in a proportional relationship with the radial force harmonics acting at SRM stator teeth. The acoustic noise reduction system includes a processor on which is installed an acoustic noise reduction application designed to derive an optimum current waveform for generating an average torque satisfying an optimum torque condition and creating radial force with minimum amplitude at the desired order of harmonics of current excitation. A reduction in the amplitude of the specific radial force harmonics utilizing the optimum current waveform minimizes the vibration and acoustic noise in the SRM. The acoustic noise reduction system applies turn-on and turn-off angles at the optimum current waveform to improve the system efficiency.

Noise reduction in switched reluctance motor with selective radial force harmonics reduction

The present embodiment is a high rotor pole switched reluctance machine (HRSRM) which provides a plurality of combinations of the number of rotor poles Rand number of stator poles Sutilizing a numerical relationship defined by a mathematical formula, R=2S&#x2212;F, when S=m&#xd7;F, wherein Fis the maximum number of independent flux paths in the stator when stator and rotor poles are fully aligned, and m is the number of phases. The mathematical formulation provides an improved noise performance and design flexibility to the machine. The mathematical formulation further provides a specific number of stator and rotor poles for a chosen m and Fp. The HRSRM can be designed with varying number of phases. The HRSRM provides a smoother torque profile due to a high number of strokes per revolution.

Low-noise, high rotor pole switched reluctance motor

A switched reluctance machine exhibiting reduced noise and vibration, the machine comprising at least one rotor arranged to rotate about a central axis, the at least one rotor comprising a set of rotor poles arranged about the central axis; at least one stator positioned concentric to and radially outward from both the central axis and the at least one rotor, the at least one stator having an outer surface and an outer surface active zone; a housing having a sleeve positioned only radially outward from the stator outer surface active zone; at least one housing endplate coupled to an end of said housing; and wherein said stator has no direct connection to said housing.

Reduced noise and vibration switched reluctance machine

A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least two stators having a plurality of stator poles. The at least two rotors and the at least two stators are positioned about a central axis with the stator placed between the rotors. In other embodiments, the number of stators equals the number of rotors and effectively operate as a single stator and rotor. In yet another embodiment, the effective single stator and rotor type high rotor pole switched reluctance machine is realized as single stator and rotor positioned concentrically around a central axis.

Mirroring of high rotor pole switched reluctance machines

Apparatus for quasi-sensorless adaptive control of switched reluct ange motor drives

Apparatus for quasi-sensorless adaptive control of switched reluctance motor drives

A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least one stator having a plurality of stator poles. The at least two rotors and the at least one stator are positioned about a central axis with the stator placed between, and laterally adjacent to the rotors. A multiple stator HRSRM comprises at least two stators having a plurality of stator poles and at least one rotor having a plurality of rotor poles. The at least two stators and at least one rotor are positioned about a central axis with the rotor placed between and laterally adjacent to the stators.

A switched reluctance machine (SRM) having a rotor and stator pole numerical relationship of S number of stator poles and R number of rotor poles, where R=2S&#x2212;2, when S is greater than 4; provides improved power density, torque production, torque ripple, and acoustic noise, and is readily adaptable to existing hardware such as known controllers and the like.

Switched reluctance machine

A digital controller is easily implemented for variable speed or torque control of an electric motor or generator by using a comparator to determine a choice of control state outputs.

Growing community of inventors

Des Plains, IL, United States of America

Piyush C Desai