Embedded Systems · Hardware & Software
3 Phase Signal Generator
A computer-controlled, adjustable frequency and amplitude three-phase sinusoidal waveform generator. The device serves as the core control unit ("brain") of an electric motors test bench.
The output signals of the generator are boosted by 3-channel power amplifiers and then fed directly to a 3-phase electric motor. Below is technical information about the generator unit itself, which was the primary engineering objective of this project.
Main features and specifications:
- Powered via computer USB interface or external 5V power supply
- Output signal waveform: Sinusoidal
- Frequency range: 1...2000 Hz
- Frequency resolution / step: 1 Hz
- Output amplitude: 0...2 V [p-p]
- Amplitude adjustment steps: 1000
- Phase shift angle: 120°
Block Diagram & Hardware PCB
Logical block diagram and assembled printed circuit board (PCB):
Hardware Architecture
Microcontroller: ATMEGA16
4-channel Parallel DAC: AD7305
Low-pass filters: TLC072
PC Interface: FT232 USB-UART
Control Software
Dedicated PC application developed for interactive generator parameters configuration:
PC application interface for frequency, amplitude, and phase monitoring