The Timken Company

Illinois Tool Works Inc.

Bradley Mularcik

Xiaolan Ai

Richard A Knepper

Keith A Neiferd

Barry Cargould

Joseph A Wnek

An electric motor comprising a rotor, a stator and a field weakening device. The rotor has a plurality of magnets mounted thereto, and the stator is located adjacent to the rotor and has a plurality of slots defined therein. The slots define raised teeth and are wound with electrical wiring to generate a magnetic field when the wiring is energized with current. The field weakening device is made from a highly magnetically permeable material and a comparatively lower magnetically permeable material. The field weakening device is disposed between the rotor and the stator and is selectively movable between a first position to align the highly magnetically permeable material between the teeth of the stator and the magnets of the rotor and a second position to align the comparatively lower magnetically permeable material between the teeth of the stator and the magnets of the rotor.

Electric motor with field weakening

An axial flux electric motor comprising a rotor and a first and second stator. The first and second stators have a first and second air gap located between the first and second stators and the rotor, respectively, and the second air gap is greater than the first gap. In one embodiment, the coils of the first stator and the coils of the second stator are in parallel. The motor further comprises switches which alternatingly energize the coils of the first stator and of the second stator based upon required torque and required speed of the motor. In a second embodiment, the coils of the first stator and the coils of the second stator are in series and the motor further comprises switches which selectively bypass the coils of the second stator in order to reduce the back EMF of the motor and increase the maximum speed of the motor at a given input voltage.

Virtual moving air gap for an axial flux permanent magnet motor with dual stators

A method and apparatus for chucking tires to be tested in a tire testing apparatus. A lower chuck assembly or spindle includes a lower rim that is engageable with a bead region of the tire to be tested. An upper chuck assembly includes an upper rim that is engageable with an upper bead region of the tire to be tested. The upper rim is reciprocally movable towards and away from the lower rim. A plurality of sensors associated with the movable rim monitors the closing distance between the upper rim and the side wall of the tire that is being chucked, during the chucking process. A controller controls the movement of the upper rim in response to the distance data obtained from the sensors. If the data obtained indicates that the tire is mispositioned on the lower rim, the controller will slow the rate of downward movement of the upper rim and reinitiate a chucking cycle if the upper rim reaches a predetermined lower position and the data from the distance sensors still indicates that the tire is not properly positioned. The sensors are mounted to an adjustable stripping mechanism that forms part of the upper chuck assembly. The positions of the sensors are adjusted as the tire strippers are adjusted.

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Copley, OH, United States of America

Bradley Mularcik