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Methods and arrangements for testing induction motors

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TLDR
In this article, the shafts of induction machines are coupled together such that they will turn in the same direction through a motor or motor and gearbox combination, which enables the torques in the shaft of the motors being tested to be balanced.
Abstract
Method apparatus Apparatus for testing induction machines by the back-to-back technique. The shafts of the motors are coupled together such that they will turn in the same direction through a motor or motor and gearbox combination. The motor or motor and gearbox combination enables the torques in the shafts of the motors being tested to be balanced.

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Patent

Method of testing induction motors

TL;DR: In this paper, a method is provided for testing induction motors, particularly single-phase fractional horsepower motors, which enables routine testing of all motors in production for both starting and running torque and other desired characteristics.
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Method of measuring characteristics of a DC motor, apparatus for implementing the method, and method of calculating inductive voltage thereof

TL;DR: In this paper, an inductive voltage is calculated based on a relationship that the elapse of time after the application of a voltage to the DC motor is stopped is proportional to the voltage across the terminals of the DC motors.
References
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Improvements in or relating to methods of and apparatus for testing dynamo-electric machines

TL;DR: In this paper, a method of testing dynamo-electric machines comprises connecting a pair of similar machines electrically to a supply and mechanically through a differential gear, the gear being driven to cause one machine to act as a motor and the other as a generator.