MAE3 Absolute Magnetic Kit Encoder

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Overview

  • Quick, simple assembly and disassembly
  • -40C to +125C operating temperature
  • Accepts ± .025" axial shaft play
  • Mounts to 0.750", 1.280" and 1.812" bolt circles
  • Fits shaft diameters from .125" to .250" or 2mm to 6mm
  • 10-bit Analog output - 2.6 kHz sampling rate
  • 10-bit PWM output - 1,024 positions per revolution, 1 kHz
  • 12-bit PWM output - 4,096 positions per revolution, 250 Hz

The MAE3 is an absolute magnetic kit encoder that provides shaft position information over 360° of rotation with no stops or gaps. This magnetic encoder is designed to easily mount to, and dismount from, an existing...

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Product Specifications

ParameterValue
Operating Temperature -40C to +125C
Storage Temperature -55C to +125C
Humidity, Non-condensing 5% to 85%
Vibration (5Hz to 2kHz) 20G.
Electrostatic Discharge, Human Body Model
MIL-STD-883E, Method 3015.7
± 2 kV
ParameterValueUnits
Max. Shaft Axial Play ±0.025 in.
Max. Shaft Eccentricity Plus Radial Play (1) 0.004 in.
Max. Acceleration 250000 rad/sec²
Moment of Inertia 8.49 x 10^-7 oz-in-s²
Mounting Screw Size (pan head) 4-40 x 1/4" -
2 Screw Bolt Circle Diameter .750 ± .005 in.
2 Screw Bolt Circle Diameter 1.280 ± .005 in.
2 Screw Bolt Circle Diameter 1.812 ± .005 in.
Required Shaft Length, including axial play (1)
  Size 220 Shaft Length-option
  Size 500 Shaft Length-option
 
0.220 (+0.015 / -0.020)
0.500 (+0.015 / -0.020)

in.
in.
 Base to Mounting Surface Torque 4 - 6  in-lbs
Shaft diameter tolerance, relative to nominal -0.0001 to -0.0006 in.
Technical Bulletin TB1001 - Shaft and Bore Tolerances Download

(1) For optimum accuracy, the magnetic hub must be fully seated on the shaft and the shaft play must meet the specified axial and radial limits.

(2) The chip that decodes position uses sampled data. There will be fewer readings per revolution as the speed increases. The formula for number of readings per revolution is given by:

10-bit PWM:

n = 625200 / rpm

12-bit PWM / Analog:

n = 156600 / rpm 

ParameterMin.Typ.Max.Units
Power Supply 4.5 5.0 5.5 Volts
Supply Current - 16 20 mA
Power-up Time - - 50 mS

10bit-analog.gifAnalog output is only available in 10-bit resolution. The analog output voltage is ratiometric to the power supply voltage and will typically swing within 15 millivolts of the power supply rails with no output load. This non-linearity near the rails increases with increasing output loads. For this reason, the output load impedance should be ≥4.7kΩ and less than 100pF. The graphs below show the typical output levels for various output loads when powered by a 5V supply.

 


ParameterMin.Typ.Max.Units
Position Sampling Rate 2.35 2.61 2.87 kHz
Propagation Delay - - 384 μS
Analog Output Voltage Maximum (1) - 4.987 - Volts
Analog Output Voltage Minimum (1) - 0.015 - Volts
Output Short Circuit Sink Current (2) - 32 50 mA
Output Short Circuit Source Current (2) - 36 66 mA
Output Noise (2) 160 220 490 µVrms
Output Transition Noise (3) - 0.03 - Deg. RMS

(1) With no output load. See graphs below.
(2) Continuous short to +5V or ground will not damage the MAE3.
(3) Transition noise is the jitter in the transition between two adjacent position steps.

 pulldown.gif

pullup.gif

The magnetic sensor chip in the MAE3 has an on-chip RC oscillator which is factory trimmed to 5% accuracy at room temperature (10% over full temperature range). This tolerance influences the sampling rate and the pulse period of the PWM output. If only the PWM pulse width ton and nominal pulse period is used to measure the angle, the resulting value also has this timing tolerance. However, this tolerance can be cancelled by measuring both ton and toff and calculating the angle from the duty cycle.

ParameterMin.Typ.Max.Units
PWM Frequency (-40C to 125C)
  10-bit
  12-bit

0.877
220

0.975
244

1.072
268

kHz
Hz
Minimum Pulse Width
  10-bit
  12-bit

0.95
0.95

1.00
1.00

1.05
1.05

μS
μS
Maximum Pulse Width
  10-bit
  12-bit

974
3892

1025
4097

1076
4302

μS
μS
Internal Sampling Rate
  10-bit
  12-bit

9.38
2.35

10.42
2.61

11.46
2.87

kHz
kHz
Propagation Delay
  10-bit
  12-bit

-
-

-
-

48
384

μS
μS
Output Transition Noise, 12-bit version (1)   .03   Deg. RMS
Output Transition Noise, 10-bit version (1)   .12   Deg. RMS
Output High Voltage (VOH: @4mA Source) (2) Vcc -0.5 - - V
Output Low Voltage (VOL: @4mA Sink) (2) - - 0.4 V

(1) Transition noise is the jitter in the transition between two adjacent position steps.
(2) Continuous short to +5V or ground will not damage the MAE3.


10-bit PWM:

x = ((t on * 1026) / (t on+ t off)) -1

If x <= 1022, then Position = x

If x = 1024 then Position = 1023

 10bit-pwm-rev3_0.jpg

12-bit PWM:

x = ((t on * 4098) / (t on+ t off)) -1

If x <= 4094, then Position = x

If x = 4096 then Position = 4095

12bit-pwm-rev3_0.jpg

Analog Output (MAE3-A):

PinNameDescription
1 5 +5VDC power
2 A Analog output
3 G Ground

PWM Output (MAE3-P10, MAE3-P12):

PinNameDescription
1 5 +5VDC power
2 A PWM output
3 G Ground

Screws

Part #: SCREW-440-250-PH
Description: 4-40 x 1/4" Pan head screw
Quantity Required for Mounting 2 per encoder
Title Date Description Download
Hub End of Life - PCN 5549 12/15/2015 This PCN is a formal notification that US Digital is discontinuing the following bore sizes for the MAE3 product line: .079 (2mm), .091 (2.3mm), .098 (2.5mm), .156 (5/32").
Download

Product Description

Restriction of Hazardous Substances

The MAE3 is an absolute magnetic kit encoder that provides shaft position information over 360° of rotation with no stops or gaps. This magnetic encoder is designed to easily mount to, and dismount from, an existing shaft to provide digital feedback information. The MAE3 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 shaft position. Analog output is only available 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. While the accuracy is the same for both encoders the 12-bit version provides higher resolution.

The MAE3 consists of three components: base, push-on magnetic hub, and encoder body. The base will accommodate 0.750", 1.280" and 1.812" mounting bolt circles. No tools are needed for the push-on, collet gripping hub. The hub mounts to a standard shaft in seconds and provides a simple and reliable means of securing the magnet to the shaft.

Two 4-40 pan head screws secure the base and encoder body to any flat surface. If desired, the encoder can be powered up and rotated by hand to any desired absolute position before the screws are tightened.

Connecting to the MAE3 is simple. The 3-pin, high retention, snap-in 1.25mm pitch polarized connector provides for +5V, output, and ground.

Product Notes
  • Cables and connectors are not included and must be ordered separately.
  • US Digital warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Cable/connector assembly not included and must be ordered separately.

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