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Motor Characteristic Determination

IP.com Disclosure Number: IPCOM000096226D
Original Publication Date: 1963-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Villa, G: AUTHOR

Abstract

The method is for determining the torque-rotation speed curve of low power asynchronous motors working in the unstable zone of its characteristic.

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Motor Characteristic Determination

The method is for determining the torque-rotation speed curve of low power asynchronous motors working in the unstable zone of its characteristic.

Motor AM to be tested is coaxially coupled to a D. C. motor M, the power of which is greater by about ten times that of motor AM. A dynamo G is also coaxially connected to load the system. Thus, the rotation speed of the system is imposed by motor M.

Since it is possible to vary over a large range the speed of motor M, motor AM can be held at any desired speed. Coaxial tachymetric dynamo TD is used to determine the rotation speed of the system. Motor AM is mounted on a support rockable around the axis of rotation of the system.

A pair of curved resilient plates are connected between rockable support and the frame of the system. This is in such a manner that an elongation of rockable support from its steady state increases the curvature of one plate and reduces the curvature of the other.

Upon the convex surface of each plate are fixed two strain gauges. The four strain gauges are electrically connected as the arms of a Wheatstone bridge.

When motor reaction torque rotates the rockable support, two strain gauges are compressed, and two are stretched. The output voltage of Wheatstone bridge is Ve=~VRq Delta R/R(R-Rg) where R is the resistance of a strain gauge in the quiet state, Rg is the resistance of a writing recorder, and V is the supply voltage of the bridge.

Since the variation D...