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Dynamic Torque Tester for a Stepper Motor Disclosure Number: IPCOM000059944D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue


Related People

Morris, CH Westerman, GS [+details]


A stepper motor has its torque measured without the necessity of a torque transducer between the stepper motor and a load. A stepper motor 1, which is to have its torque tested and can be a permanent magnet, virtual reluctance, or hybrid motor, is directly coupled to a DC motor 2 through a bellows coupling 3. The DC motor 2 is used to both drive the stepper motor 1 to a desired constant speed and then to act as a variable load. The relationship of the torque and current of the DC motor 2 is approximately linear so that the DC motor 2 serves as a torque-measuring device when the DC motor 2 acts as a load. An IBM personal computer 4 automatically controls the testing to reduce test time to a minimum.