MAE4 Encoder Description The MAE4 is a magnetic absolute encoder kit that provides shaft position information over 360° of rotation with no stops or gaps. This encoder is designed to mount on an existing shaft and provides digital feedback information. The MAE4 is available with an analog or a pulse width modulated (PWM) digital output.
Analog output provides a DC voltage that is proportional to the absolute shaft position with 12-bit resolution.
PWM output provides a pulse duty cycle that is proportional to the absolute shaft position. PWM output has 12-bit resolution with 2 different output frequency options.
The MAE4 consists of three components: base, push-on magnetic hub, and encoder body. Base options for 0.750 in., 1.280 in., and 1.812 in. bolt circles are available. 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 a flat surface. If desired, the encoder can be powered up and rotated by hand to a reference position before the screws are tightened.
The MAE4 is connected using a 3-pin latching,1.25mm pitch polarized connector.
Due to the MAE4's push-on hub design, it is recommended for use as a one-time installation.
Product Specifications
ENVIRONMENTAL
PARAMETER
VALUE
UNITS
Operating Temperature
-40 to +125
C
Vibration (10Hz to 2kHz, sinusoidal)
20
G
Shock (6 milliseconds, half-sine)
75
G
Electrostatic Discharge, IEC 61000-4-2
± 4
kV
MECHANICAL
PARAMETER
VALUE
UNITS
Required Shaft Length, including axial play (1)
Max. Shaft Runout (1)
0.004 T.I.R.
in.
Max. Acceleration
250000
rad/sec²
Max. Hub Moment of Inertia
9.42 x 10-7
oz-in-s²
Mounting Screw Size
#4-40 x 1/4
in.
Mounting Screw Torque
4 - 6
in-lbs
Mounting Screw Spacing Tolerance
±0.005
in.
(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 the number of readings per revolution is given by:
n = 400000 / rpm
ELECTRICAL
PARAMETER
MIN.
TYP.
MAX.
UNITS
Power Supply
4.5
5.0
5.5
Volts
Supply Current
6.5
mA
Power-up Time
10
mS
ANALOG OUTPUT OPERATION
Analog output has 12-bit resolution. The analog output voltage is ratiometric to the power supply voltage, which is typically 5.0V. To prevent excessive jitter of the output at the 0 to 360 deg. transition point, 10-LSB of hysteresis is applied to the angle position at this point.
PARAMETER
MIN.
TYP.
MAX.
UNITS
Position Sampling Rate
6.667
kHz
Propagation Delay
286
μS
Output Noise (1-σ)
0.043
Deg. RMS
Max Output Voltage
V
Min Output Voltage
V
Capacitive Load
1000
pF
PWM OUTPUT OPERATION
To measure the angular position accurately, calculate the position from the duty cycle (ton / (ton + toff )) instead of just measuring ton . This will cancel out the effect of the PWM frequency tolerance. To prevent excessive jitter of the output at the 0 to 360 deg. transition point, 10-LSB of hysteresis is applied to the angle position at this point.
PARAMETER
MIN.
TYP.
MAX.
UNITS
PWM Frequency
Hz
PWM Duty Cycle (1)
2.942
97.058
%
Position Sampling Rate
6.667
kHz
Propagation Delay
286
μS
Output Noise (1-σ)
0.043
Deg. RMS
Output High Voltage
V
Output Low Voltage
V
Capacitive Load
1000
pF
(1) PWM cycle time is 4351 internal clock periods. There are 4096 possible values of the duty cycle with a minimum value of (128/4351) and a maximum of (4223/4351).
PIN-OUTS
ANALOG OUTPUT (MAE4-A):
PIN
NAME
DESCRIPTION
1
5
+5VDC power
2
A
Analog output
3
G
Ground
PWM OUTPUT (MAE4-H, MAE3-L):
PIN
NAME
DESCRIPTION
1
5
+5VDC power
2
P
PWM output
3
G
Ground
ACCESSORIES
MOUNTING SCREWS
Part #:
SCREW-440-250-PH
Description
4-40 x 1/4" Pan head screw
Quantity Required
2 per encoder
Additional Information
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.
Assembly Instructions
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Datasheet
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