Incremental encoder is the most common sensor used for Field Oriented Control (FOC) of Permanent Magnet Brush Less DC (BLDC) or Permanent-Magnet Synchronous Motor (PMSM). This sensor gives relative angular position as the output in the form of pulses. A quadrature encoder, typically produces two outputs, which have pulses phase shifted by 90°. The phase shift between the two signals A and B represents the direction of rotation. The encoder interface logic uses edge detection on rising edge and falling edge of A and B. This gives a resolution that is four times the encoder resolution and produces a very high resolution from a low cost encoder.
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Features and Benefits
- Quadrature Decoding :
- Interfaces with incremental encoders using A/B signals, detecting both rising and falling edges.
- Achieves 4× resolution compared to base encoder pulses.
- Outputs electrical angle (scaled 0–262143 = 0–360°).
- Integration :
- Calculates rotor speed by measuring rate of angle change.
- Designed for 200 MHz operation with moderate LUT/DFF usage, no DSP blocks.
Licensing Options
Encrypted RTL free with any Libero license
Documentation
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| Encoder Interface User Guide | Download |