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Dynamic Response Measurement of Motor Characteristics

IP.com Disclosure Number: IPCOM000074945D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Chambers, RL: AUTHOR [+2]

Abstract

This method of motor response measurement provides a record of motor characteristics for all four quadrants of the torque-versus-speed curve. The motor 1 to be tested is mounted on stationary fixture 2 by a torque transducer 3. An inertia load 4, such as a flywheel, and a motor speed transducer 5, such as a DC tachometer, are attached to motor shaft 6.

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Dynamic Response Measurement of Motor Characteristics

This method of motor response measurement provides a record of motor characteristics for all four quadrants of the torque-versus-speed curve. The motor 1 to be tested is mounted on stationary fixture 2 by a torque transducer 3. An inertia load 4, such as a flywheel, and a motor speed transducer 5, such as a DC tachometer, are attached to motor shaft 6.

The motor is then energized in two modes of operation, for both rotational directions by motor control system 7. The first mode is a drive-coast-dynamic brake mode. The second is a drive forward-drive reverse mode. The motor torque and speed developed during these operations are simultaneously recorded by instrumentation tape recorder 8. The speed of operation of the tape recorder is then reduced, as by a factor of 16-to-1, and the recorded results are reproduced on X-Y graphic recorder 9.

Alternatively, the output of transducers 3 and 5 can be connected to a computer that is programmed to compare the characteristics of the motor to a standard characteristic.

This method can be used to continuously record the motor acceleration torque during the period from zero velocity to terminal velocity, to measure the time required for the motor to develop its maximum torque when accelerated from zero velocity, to measure the dynamic braking torque which the motor develops when it is dynamically braked at any given speed, and to compare the dynamic characteristics of a mot...