SAME SKY | SERIES: AMT33 | DESCRIPTION: MODULAR COMMUTATION ENCODER

date 09/12/2024 | page 10 of 11

sameskydevices.com

APPLICATION NOTES (CONTINUED)

The AMT33 series encoder requires minimal setup time for brushless DC (BLDC) motor applications. Installation can be completed with either a PC

with the AMT Viewpoint™ application installed, an AMT-OTZ-1 zero alignment module, or any 5V serial interface. The following steps explain the proper

commutation alignment procedure for the AMT33 encoder.

1.

Ensure AMT33 encoder is set for correct pole count. To verify or change settings use the AMT Viewpoint™ software.

2.

Mount encoder following AMT Assembly procedure.

3.

Use the motor manufacturer’s documentation to determine the correct motor phase to energize for alignment. Energized phase will coincide with

the rising edge of the AMT33 encoders ‘U’ signal. This typically means energizing phase 1 by applying positive voltage to the wire labeled ‘phase 1’,

and grounding the wire labeled ‘phase 2’. The third wire always remains unconnected.

4.

Using a power supply, energize the two wires found previously. This will lock the rotor into a fixed position.

5.

Connect AMT33 encoder to an AMT-OTZ-1 zero alignment module, the AMT Viewpoint™ application, or any suitable 5V serial interface.

6.

Use any of the connected devices to issue an alignment command to the encoder. This will digitally set the rising edge of ‘U’ and the ‘Z’ index to the

current angular position.

7.

Remove power from motor phase windings; connect motor and encoder to proper motor driver.

8.

If the above is done correctly your AMT33 encoder is now ready for operation. As a verification of alignment you may power the encoder, and use

an oscilloscope to monitor phase 1 of the motor and the ‘U’ channel of the encoder as you hand spin the motor. If alignment is correct, the square

wave generated on the ‘U’ channel will overlap perfectly with the sine wave generated by phase 1 of the motor. If alignment does not match, recheck

motor documentation and retry alignment procedure.

COMMUTATION ALIGNMENT AND ZERO POSITION

Additional Resources: Product Page | 3D Model