Agilent Technologies U8001A Specifications download pdf (Page 45)

Instrumentation Laboratory Exercise 42

Laboratory Exercise 5

Motor speed-torque characteristics

Apparatus

• One 0.5 Ω, 5 W resistor

• Inferred reflective- type emitter/detector (IRPD)

• Small permanent magnet (PM) DC motor

• Test/prototyping board

• Agilent U2351A, U2352A, U2353A, or U2354A USB multifunction

data acquisition device

• Agilent E3620A 50 W dual output power supply or Agilent

U8001A/U8002A single output DC power supply

5.1 Introduction and objectives

The purpose of this lab is to measure the speed of a motor as a

function of input voltage. The motor spins an "index wheel" which has

eight regularly spaced holes near the periphery. A reflective type

inferred emitter- detector pair will detect these as they pass by.

The IR sensor should be aligned to give a nearly square wave output.

The frequency of this signal is eight times the motor's speed. The

motor voltage and speed signal will be read into the DAQ setup. You

will calculate the motor speed based on the frequency of the speed

signal and the number of transitions per revolution on the index

wheel. The raw signal and processed output (speed in rpm) should be

displayed, and the speed should be graphed as a function of motor

voltage on a two- dimensional plot.

The motor voltage should be varied from zero to the maximum setting

over the course of several seconds to get a good graph. Additionally

you should capture the "spin up and down" curves of the motor. To

do this the power supply should be set to the motors maximum

rating, and disconnected from the motor.

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Agilent Technologies U8001A Specifications Page 45