罗马尼亚采购需求：步进电机、电机轮、步进驱动器、机器人轮、机器人电机、AMR 直流电机

We are developing a mobile robot with a weight capacity of around 20kg and are interested in your hub motor wheels. We're specifically looking for wheel sizes ranging from 4 inches to 8 inches. Additionally, we require integrated electronics for control purposes, preferably utilizing either UART or RS485 communication protocols. Could you provide recommendations on suitable products in your lineup that meet these specifications? We'd also appreciate details regarding your lead times and the expected price range for these components. Looking forward to your suggestions!