关键词: 电动机保护, FPGA, 同步采样, Wi-Fi技术

Abstract:

At present, most motor protectors use single-chip microcomputer as the controller, but the computing capability is weak and it is difficult to achieve synchronous sample for the multi-channel analog signal of the three-phase motor. The FPGA microprocessor EP4CE10F17C8 with high-speed parallel computing capability was adopted as the controller to achieve high-speed signal processing. The multi-channel synchronous sampling chip AD7606 was adopted to achieve synchronous sample for the multi-channel analog signal of the three-phase motor. In addition, the Wi-Fi technology was used to achieve wireless communications between the mobile devices and protectors, parameter settings and real-time monitoring were realized. The controller FPGA, signal sampling, human-computer interaction, wireless communications and other hardware circuits were designed, and the system software was conducted. Experimental results validate that overload protection, blocking, short circuit, phase failure, reverse phase, three-phase unbalance and grounding protection functions can be achieved by this protector, and the protection action is accurate.

Key words: motor protection, FPGA, synchronous sampling, Wi-Fi technology