Nelson Products
The Nelson Liquid Drive is a heavy-duty power transmission designed for use in continuous operating installations demanding a high level of reliability. It is an efficient, simple and reliable device for controlling speed or toque and acceleration of driven equipment.
Nelson fluid drives allow the use of standard design motors without the need for less efficient, high starting torque motor designs. The Nelson Liquid Drive provides infinite variable speed with the proper cooling, no-load starts, smooth application of torque, ability to balance loads between multiple drives and will not transmit shock loads.
Our Technology, the Mainstay of the Nelson Drive
The Nelson Liquid Drive is a hydro-kinetic power transmission. The basic Nelson Liquid drive concept of transferring energy or power is dependent upon the employment of hydro-kinetic principals. Consequently, it transfers power by imparting, and subsequently removing, kinetic energy from a liquid medium contained within the functional elements of the transmission. It is the application of these hydro-kinetic principles that permit the Nelson Liquid Drive to control output, speed and power.
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Provide No-Load Starting
- Since starting load requirements are greatly reduced, you can use a more economical starting system. Less expensive motors can be selected based on running loads rather than starting loads. Normal torque motors may be used.
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Infinitely Variable Speed Control
- Of driven equipment through a wide range of speeds.
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Protection from Shock and Vibration
- Nelson Liquid Drives protect driver and driven equipment from initial starting shock and running vibration. To our customers, this means lighter duty gears, drivetrains and cost reduction.
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Torque Limiting Capabilities
- Provide drivetrain or driven equipment protection.
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Minimize Starter, Motor and Geartrain Wear
- If the process requires intermittent driven machine operation. Rapid declutching eliminates demand charges, shocks and wear and tear.
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Automatic or Manual Control
- Nelson Liquid Drives can be easily adapted to either manual or completely automatic control.
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Controlled Acceleration or Deceleration
- Nelson Liquid Drives can control the rate of acceleration or deceleration of driven equipment once the driver reaches full speed.
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Minimize Horsepower Requirements
- On centrifugal equipment by supplying flow requirements rather than throttling at full speed.
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Minimize Driven Machine Maintenance, Wear and Noise
- Since driven machines often run at reduced speed.
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Ruggedness and Reliability Second to None
- A Nelson Liquid Drive’s construction assures rigidity and internal component alignment. And, since the only wear parts are bearings and seals, we use only high-quality bearings and seals designed for long life.
PM2
The PM2 “POWER MATE” is a recirculating oil-operated variable speed liquid drive. It is foot-mounted and uses a standard NEMA “C”, face mounted, round frame electric motor. Solid cast iron or aluminum housing.
- Four Models: 235, 275, 320, 370
- 7.5 to 150 HP @ 3600 RPM
- 1 to 125 HP @ 1800 RPM
- Built-in oil reservoir
- External electric motor-driven circulating pump
- Externally mounted heat exchanger
- Bi-directional rotation
PM4
The PM4 “POWER MATE” is a recirculating oil-operated variable speed liquid drive. It is horizontally foot mounted with input and output shafts and uses a standard NEMA electric motor. Solid cast iron or aluminum housing.
- Twelve Models: 235, 275, 320, 370, 435, 460, 505, 565, 590, 685, 800, 935
- 7.5 to 150 HP @ 3600 RPM
- 1 to 1000 HP @ 1800 RPM
- 7.5 to 800 HP @ 1200 RPM
- Built-in oil reservoir
- Externally mounted heat exchanger
- Special reservoir and housing arrangement provide unequalled compactness
- Bi-directional internal or external recirculating pump
- Bi-directional rotation
PM5
The PM5 “POWER MATE” is a horizontal, heavy-duty recirculating, oil-operated variable speed liquid drive. Fabricated steel, horizontally split housing utilizing anti-friction main bearings. Foot-mounted with input and output shafts.
- Five Models: 590, 685, 800, 935, 1090
- 600 to 5000 HP @ 1800 RPM
- 200 to 5000 HP @ 1200 RPM
- Externally mounted, electric motor-driven, oil circulating pump permits easy inspection and service.
- Removable split housing cover allows inspection and maintenance of internal parts without disturbing input or output shaft alignment.
- Pressure lubricated anti-friction bearings
- Available in either rotation
PM6
The PM6 “POWER MATE” is a heavy-duty, recirculating oil-operated, fabricated steel, horizontal, variable speed liquid drive. Horizontally split housing utilizing radial sleeve and tilting pad thrust bearings. Foot mounted with input and output shafts.
- Ten Models: 320, 370, 435, 460, 505, 562, 590, 685, 800, 935
- 150 to 5000 HP @ 3600 RPM
- 20 to 5000 HP @ 1800 RPM
- 7.5 to 5000 HP @ 1200 RPM
- Externally mounted, electric motor driven, oil circulating pump permits easy inspection and service.
- Removable split-housing cover allows inspection and maintenance of internal parts without disturbing input or output shaft alignment.
- Input and output shafts are equipped with sleeve radial bearings and tilting pad, thrust bearings that can be replaced in position.
- Available in either rotation
PM7
The PM7 “POWER MATE” is a self-contained, oil-operated, vertical variable speed liquid drive. Its output shaft thrust capacity can accommodate most deep-well vertical turbine pumps. Output shaft can be furnished as keyed, keyed and ring groove or threaded design.
- 7.5 to 150 HP @ 3600 RPM
- 1 to 1000 HP @ 1800 RPM
- 7.5 to 5000 HP @ 1200 RPM
- Externally mounted, electric motor driven circulating pump provides flexibility of mounting and design for both load and control requirements.
- Externally mounted oil circulating pump permits easy inspection and service.
- Easily adaptable to most hollow-shaft motors with motor modification