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Direct-drive, high torque, low speed PM motor with multiple pole configurations — eliminates the gearbox and its maintenance burden in beam pumps, screw pumps, and conveyors.
The gearbox is the most failure-prone, highest-maintenance component in any rod-pump or screw-pump drive train. It leaks oil, wears bearings, strips gears, and requires regular oil changes — all while consuming 3 – 8% of input power in frictional losses. The Jingtao Energy Multipole Multispeed Motor eliminates the gearbox entirely by generating rated torque at the load’s native speed. Instead of a 1,500 rpm 4-pole motor + 10:1 gearbox, a 40-pole multipole motor delivers full torque at 150 rpm — directly coupled to the polished rod or pump shaft. Multiple pole configurations (8, 12, 16, 24, 32, 40, 48 poles) allow precise speed matching to the application without mechanical reduction. The motor uses permanent-magnet rotor technology for high efficiency and power factor, and integrates with a VFD for soft starting, speed trimming, and regenerative braking. Field data from Changqing and Daqing show that eliminating the gearbox reduces total drive-train maintenance cost by 60 – 75% while improving system efficiency by 8 – 12 percentage points — savings that accumulate over the motor’s 15 – 20 year service life.
Conventional drive trains pair a 4-pole (or occasionally 6-pole) motor running at 1,500 / 1,800 rpm with a gearbox to convert high speed and low torque into the low speed and high torque the load requires. The Multipole Multispeed Motor inverts this logic:
1. Pole-count torque multiplication: Motor torque is proportional to the product of magnetic flux and the number of poles. A 40-pole motor produces — for the same flux density and current — 10 times the torque of a 4-pole motor at 1/10th the speed. This is intrinsic electromagnetic torque multiplication, achieved without mechanical components. NdFeB permanent magnets on the rotor provide the high flux density needed to make high pole counts practical in a compact frame.
2. Direct shaft coupling: The motor shaft directly drives the load at its native speed — no gearbox, no belts, no chains. For beam pumps, the multipole motor’s hollow shaft accepts the polished rod directly. For screw pumps, a flange-mount connects to the drive head. The only rotating components are the motor bearings and the load shaft — eliminating gear-mesh friction, oil-churning losses, and seal leakage.
3. Multispeed flexibility: For applications requiring occasional speed changes (e.g., different pump speeds for different well conditions), pole-changing windings provide 2 – 3 discrete synchronous speeds from a single motor winding — no VFD required. For continuous speed regulation, the motor pairs with a VFD operating in sensorless or closed-loop vector control. At very low speeds (<10 rpm), a resolver or absolute encoder provides precise rotor position feedback for smooth torque delivery without cogging.
4. Regenerative capability: On beam pumps, the downstroke is an overhauling load — gravity pulls the rod string down. The multipole motor, driven by a 4-quadrant VFD, operates as a generator during the downstroke, returning energy to the DC bus or grid. This regenerative braking recovers 10 – 15% of cycle energy that would otherwise be dissipated as heat in a mechanical brake.
| Feature | Geared Induction Motor | Single-Speed PM Motor | Jingtao Multipole Multispeed Motor |
|---|---|---|---|
| Speed Flexibility | Fixed — gear ratio determines speed | Fixed — single pole configuration | Multiple pole configs — multi-speed operation |
| Gearbox Required | Yes — adds cost, maintenance, efficiency loss | Sometimes — depends on speed match | No — direct drive, high torque at low speed |
| Starting Torque | 1.5× rated (with gear reduction) | 2× rated | 2.5× rated — handles cyclic beam pump loads |
| Maintenance Points | Motor + gearbox oil changes, bearing greasing | Motor only | Motor only — IP55, sealed bearings |
| Efficiency at Low Speed | Poor — gear losses compound | Good — but fixed speed limits optimization | Excellent — IE4+ across speed range |
| Application Fit | Fixed-speed beam pumps | Single-speed applications | Beam pumps, screw pumps, conveyors — variable duty |
Every application has a unique torque-speed requirement. Our engineers will review your load profile — speed, torque, duty cycle, and mounting constraints — and deliver a custom technical proposal with pole-count selection, frame sizing, VFD pairing recommendation, system efficiency comparison (against your current geared drive), and a total-cost-of-ownership analysis — within 48 hours.
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Or contact us directly: +86 18661390903 | [email protected]
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