**Akarin Servo PCB (Rev. F)**

- Processor: ADSP-21479 floating point DSP
- Bus voltage(max): 60v
- Output power(max): 400W
- Modulation frequency(max): 24000Hz
- Servo mode: position, velocity, torque
- Encoder resolution: 14bit
- Modbus-RTU over RS-485

**Features:**

**Motor state estimation using the Kalman filter**

A Kalman filter is utilized to estimate the kinematic state of the motor. Smooth velocity estimation is accomplished to achieve high performance velocity control, even at very low speed.

**Real-time vibration detection and suppression**

The hardware FFT accelerator provided by the digital signal processor is utilized to analyze the error signal. Ten IIR notch filters are tuned in real-time based on the FFT result to detect and suppress mechanical vibration.

**Jerk limited trigonometric velocity profile**

A trigonometric velocity profile with jerk limitation is applied in the trajectory generation and interpolation for optimum kinematic performance.

**Space vector modulation(SVPWM) / Field orientation control(FOC)**

The modulation method applied is FOC based on SVPWM.

**Multi-axis synchronized motion test**

A multi-axis CNC milling machine is built to test the servo drives. It has 6 degrees of freedom - X, Y, Z, A, B and spindle. All axes are driven by AKARIN AC servos. X, Y, Z servos are rated 200W, A axis is rated 125W, B axis is rated 150W and spindle is rated 400W.

In this demonstration, two pencil leads were chucked onto the A axis, a flange with corresponding holes and two screws was installed on the spindle servo. A series of complicated motions were implemented using the AKARIN servos, running at very high speed(up to 3000RPM), without breaking the pencil leads.

**High speed arc interpolation**

**Drawing demo**

Wow, amazing job! I have one question. Would it be possible to increase the voltage to 100 - 150V ? I have a few 100v ac , 1000w sanyo denky servos motors. Wondering if I can make them work?

I am impressed with the demos and your cnc build. Great job!