Screw Pump Permanent Magnet Direct Drive Motor

The Screw Pump PM Direct Drive Motor is purpose-built for Progressive Cavity Pump (PCP) applications in heavy oil, high-sand, and deep-deviated wells. By eliminating the conventional gearbox and belt drive entirely, it mounts the PM motor directly on the polished rod — no intermediate transmission, no alignment issues, no belt slippage.

Designed for low speed (50–300 RPM), high torque operation at the wellhead, this motor solves the three persistent failure modes of conventional PCP drive systems: belt wear in sandy environments, gearbox oil leaks at high ambient temperatures, and misalignment-induced vibration. The result is 95%+ mechanical efficiency and a dramatically simplified wellhead — fewer parts, fewer failures.

How Direct Drive Transforms PCP Operations

Conventional PCP drive heads cascade energy losses through three stages: the electric motor → belt drive (3–5% loss) → right-angle gearbox (8–12% loss) → polished rod clamp. Each stage is a maintenance point, and in sandy or high-temperature wells, belt slippage and gearbox seal failure are operational constants.

The PM Direct Drive Motor uses a hollow-shaft permanent magnet rotor that slips directly over the polished rod. The rotor’s magnetic field produces high torque at low RPM — no gearing needed. A VFD provides stepless speed control from 20 to 300 RPM, and the hollow shaft design allows the polished rod to pass through the motor center, eliminating the right-angle drive head entirely.

The motor is sealed to IP56 and wound with Class H insulation (180°C), making it suitable for desert summer operations (ambient 55°C+) and dusty well sites where belt drives would fail within weeks.

Key Technical Specifications

• Motor Type: Hollow-shaft Permanent Magnet Synchronous Motor (PMSM), direct drive
• Power Range: 5.5 kW – 37 kW (7.5 HP – 50 HP)
• Speed Range: 20 – 300 RPM (continuously variable via VFD)
• Rated Torque: 300 N·m – 3,000 N·m
• Efficiency: ≥95% (motor + system, no gearbox losses)
• Power Factor: ≥0.97
• Protection Class: IP56 (dust-tight, heavy sea/water-jet resistant)
• Insulation Class: Class H (180°C continuous, 200°C peak)
• Polished Rod Diameter: Accommodates 28 mm, 32 mm, 38 mm (standard) — custom sizes available
• Ambient Temperature Range: -40°C to +55°C
• Control: Sensorless vector VFD with auto-torque compensation, Modbus RTU / 4G remote monitoring ready
• Maintenance-Free Bearings: Greased-for-life, rated 60,000 hours L10

Competitive Comparison

System efficiency (95%+) independently verified by pump test bench measurements per ISO 5198. Belt maintenance reduction based on 3-year field data from beam pumping units in Shengli Oilfield.

Field-Proven Applications

• Heavy Oil PCP Wells (API 8°–15°): High starting torque (200% rated) overcomes cold heavy oil resistance without over-sizing. Sensorless vector control maintains stable RPM even as viscosity fluctuates.
• High-Sand PCP Wells: Sealed IP56 enclosure eliminates sand ingress into bearings and windings. No exposed belts to slip or abrade in blowing sand conditions. Deployed in Xinjiang’s sandy oilfields with 98.5% uptime over 18 months.
• Deep Deviated Wells (1,500m+): High torque density enables PCP operation at depths where rod string torque exceeds conventional drive head capacity. 3,000 N·m peak handles 2,000m+ PCP installations.
• Coalbed Methane (CBM) Dewatering: Low-speed precision (20–50 RPM) for long-duration CBM dewatering pumps. Remote 4G monitoring eliminates daily wellhead visits.
• Cluster Well Pads: Compact single-unit design reduces wellhead congestion on multi-well pads. One operator can monitor 12+ wells from a central SCADA terminal.

Why Choose Jingtao Energy

• Heavy Oil Proven: 85+ units operating in heavy oil fields including Liaohe, Xinjiang, and Shengli. Mean time between failures (MTBF) exceeding 14,000 hours in sand-producing wells.
• Complete Drive Package: Delivered as a pre-configured system: PM motor + matched VFD + polished rod clamp + remote monitoring module. One vendor, one warranty, zero integration headaches.
• Rapid Retrofit: Replaces existing PCP drive head in 6–8 hours using standard wellhead adapter flange. No crane required — lift with rig service hoist.
• Remote Intelligence: Every motor ships with a 4G-enabled IoT gateway. Real-time torque, RPM, temperature, and power data stream to your SCADA or Jingtao’s cloud dashboard. Predictive maintenance alerts before failures occur.

📋 Eliminate belt changes and gearbox overhauls from your PCP maintenance schedule.

Share your PCP model, well depth, and fluid viscosity — we’ll specify the exact PM Direct Drive configuration and calculate your projected energy savings.

Request PCP Drive Specification Speak to a PCP Specialist

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