What is a servo unit?

In 2003, IR Corporation of the United States launched a single-chip rate servo control system, which includes: motor vector FOC controller, current PI regulator, speed PI regulator, SVPWM modulator, sensor interface, SPI and parallel communication interface, etc. The most important feature of the single-chip rate servo control system launched by IR Corporation is that it allows users to set hundreds of parameters in real time and initialize them. This technology implements all servo control modules such as FOC controller, current PI regulator, speed PI regulator, position PID regulator, speed feedforward controller, IIR filter, SVPWM modulator, trapezoidal speed trajectory generator, position command processor, monitoring and protection link, communication module, register stack, etc. in one FPGA, and integrates CPU internally, which can complete keyboard, display and external communication control, and is a true digital programmable system on chip (SOPC).
Since all control algorithms are implemented in hardware, the servo controller can achieve quite high performance. The sampling frequency of its current loop and speed loop can reach 20kHz, and the sampling frequency of the position loop can reach more than 10kHz. The frequency index is mainly limited by the performance of the chip itself. All internal registers can be accessed through the host computer, which can achieve various control purposes. All parameters can be modified online, including switching frequency, dead time, regulator parameters, filter parameters, etc. It is suitable for drive control of different motors such as PMSM, IM, BLDCM, and is compatible with various sensor interface signals such as Hall sensors, incremental/absolute code disks, magnetic encoders, and resolvers. It can receive various input signals such as pulse commands, analog commands, and digital commands, and can complete all operation functions through the host computer or control panel. It has a controller identification code interface, which is easy to realize multi-axis control. This single-chip controller greatly reduces the system volume, improves anti-interference, and with perfect protection measures, ensures the reliability of system operation.