Data sheet

MA3
Description

Miniature Absolute Magnetic Shaft Encoder
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The MA3 is a miniature rotary absolute shaft encoder that reports the shaft position over 360 with no stops or gaps. The MA3 is available with an analog or a pulse width modulated (PWM) digital output. Analog output provides an analog voltage that is proportional to the absolute s haft position. Analog output is onlyavailable in 10-bit resolution. PWM output provides a pulse width duty cycle that is proportional to the absolute shaft position. PWM output is available in 10-bit and 12-bit resolutions. Wh ile the accuracy is the same for both encoders, the 12-bit version provides higher re solution. Three shaft torque versions are available. The standard torque version has a sleeve bushing lubricated with a viscousmotion control gel to provide torque and feel that is ideal for front panel human interface applications. The no torque added option has a sleeve bushing and a low viscosity lubricant (t hat does not intentionally add torque) for low RPM applications where a small amount of torque is acceptable. The ball bearing version uses miniature precision ball bearings that are suitable for high speed and ultralow torque applications. The shaft diameter for ball bearing ver sion option is 1/8" rather than 1/4". Connecting to the MA3 is simple. The 3-pin high retention snap-in 1.25mm pitch polarized connector provides for +5V, output, and ground.

Features
Patent pending Miniature size (0.48" diameter) Non-contacting magnetic single chip sensing technology -40C to 125C. operating temperature range10-bit Analog output - 2.6 kHz sampling rate 10-bit PWM output - 1024 positions per revolution, 1 kHz 12-bit PWM output - 4096 positions per revolution, 250 Hz

Related Products & Accessories
CA-MIC3-SH-NC 3-Pin Micro / Unterminated Shielded Cable (Base price $7.30) CA-MIC3-W3-NC 3-Pin Micro / Unterminated 3-Wire Discrete Cable (Base price $6.80) CON-MIC3 3-Pin Micro Connector (Base price $3.15)Mechanical Drawing

MA3

Miniature Absolute Magnetic Shaft Encoder
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Mechanical
Specification
Moment of Inertia Angular Accuracy Angular Accuracy Over Temperature Shaft Speed Acceleration Vibration Shaft Torque Shaft Loading Bearing Life Weight Shaft Runout

Sleeve Bushing
4.1 x 10^-6 oz-in-s² <0.5 deg. @ 25C <0.9 deg. @ -40C to 125C 100 RPM max. continuous 10,000 rad/sec² 20G. 5Hz to 2kHz0.5 ± 0.2 in. oz. (D - torque option) 0.3 in. oz. max. (N - torque option) 2 lbs. max. dynamic* 20 lbs. max. static 0.46 oz. 0.0015 T.I.R. max.

Ball Bearing
4.1 x 10^-6 oz-in-s² <0.5 deg. @ 25C <0.9 deg. @ -40C to 125C 15,000 RPM max. continuous 250,000 rad/sec² 20G. 5Hz to 2kHz 0.05 in. oz. max. 1 lb. max. (40/P)³ = life in millions of revs. where P = radial load in pounds 0.37 oz. 0.0015 T.I.R.max.

* When a pulley, gear, or friction wheel drives the shaft, the Ball Bearing option is recommended instead of the Sleeve Bushing. The c hip that decodes position uses sampled data; note that there will be fewer readings per revolution as the speed increases. The formula f or number of readings per revolution is given by:

MA3
n = (60 / (rpm * 96 usec))

Miniature Absolute Magnetic ShaftEncoder
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Environmental
Parameter
Operating Temperature Storage Temperature ESD Humidity Non-condensing

Value
-40C to +125C -55C to +125C ± 2 kV max. 5% to 85%

Mounting
Parameter
Hole Diameter Panel Thickness Panel Nut Max. Torque

Value
0.375" +0.005 / -0.0 0.125" max. 20 in.-lbs.

Materials
Parameter
Shaft Bushing

Dimension
Stainless Brass

Magnetic Field Crosstalk
The MA3 absoluteencoder contains a small internal magnet, mounted on the end of the shaft that generates a weak magnetic field extending outside the housing of each encoder. If two MA3 units are to be installed closer than 1 inch apart (measured between the center of both shafts), a magnetic shield, such as a small steel plate should be installed in between to prevent one encoder from causing small changes in...