Panpu SRM Switched Reluctance Motor Drive System Case Study | Oilfield Production Zone | Beam Pump Load Speed Control and Soft Start Retrofit

The pumping unit in this work area experiences periodic load variations: heavy load during the upstroke and near-zero load during the downstroke. The original asynchronous motor was sized for peak load, resulting in an average utilization rate of less than 40%. Additionally, starting current reached over 5 times the rated value each time, causing grid voltage fluctuations and mechanical stress on belts and gearboxes. The retrofit uses an SRM200L1-30 switched reluctance motor paired with an SRD intelligent controller. Leveraging the system's high starting torque and low starting current, it enables soft starting. Speed is adjusted within a range from 50r/min to rated speed based on stroke frequency requirements, ensuring precise matching between motor output and actual load. The controller is wall-mounted next to the wellsite distribution cabinet and includes protection against overvoltage, undervoltage, phase loss, overload, jamming, overcurrent, and overheating. In unmanned wellsite operations, faults are self-diagnosed and can be manually reset. After retrofitting, the system connects to a digital motor IoT platform. Operators can monitor real-time power consumption, operating conditions, and alerts via PC or mobile devices, enabling quick detection of no-load running and frequency reduction events.