A Practical Primer On Motor Drives (Part 16): Torque, Speed, Position, And Direction Sensing

Focus:

In most cases, optimal operation of a motor by a variable-frequency drive requires some direct sensing of the motor operation (sensored) or control system calculation of these quantities from other known data (sensorless). A motor running in a sensorless mode in normal operation would likely still be instrumented during design testing, or instrumented differently. This part 16 discusses the different parameters that are measured in motor applications—namely torque, speed, and rotor shaft position—and describes operation of the various types of analog and digital sensors used to measure these variables. Torque sensors described include those with 0-xVdc, mV/V, and frequency modulated outputs. Analog speed, direction and position sensors described include analog tachometers and resolvers. Digital speed, direction, and position sensors include pulse tachometers, Hall effect sensors, and quadrature encoder interfaces. Angle tracking observers and their use with analog and digital encoders are also discussed. Measurements of various sensor outputs and related calculations are demonstrated using Teledyne LeCroy’s Motor Drive Analyzer.

What you’ll learn:

• How to measure torque, speed and rotor shaft position in motor applications using various types of sensors

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Author & Publication:

Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y, How2Power Today, May 16 2017

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