HP Electromagnetic Vibrating Feeders

Feature Overview: Jeffrey HP Electromagnetic Vibrating Feeders 

Homogeneous Core Only grain oriented, high flux density  steel laminations are used for our wound stator core. This produces a more powerful electromagnetic drive for higher stroke, larger capacity, and thus a smaller feeder than the competition. Plus, it results in more tonnage on deck sizes, the same as our competition.

Sub-Resonance Tuning
As the deck liner wears, sub-resonance tuning assures efficient, continued feeder operation.

Electromagnetic Operation
There are no moving parts that could wear and require replacement. With a well-maintained Jeffrey feeder, you’re assured trouble-free service.

High-Frequency Vibration
With an appropriate deck slope, high-frequency vibration affords conveying speeds as high as 65 FPM.

Recommended Hopper Design
With every order, we furnish a recommended hopper design that is the result of decades of experience. Proper installation, in accordance with our charts, assures correct deck loading, proper material withdrawal from the hopper, and continuous production.

Vibration Absorbers
Shipped with each feeder are vibration-absorbing spring assemblies for either suspension or support mounting.

Design Flexibility
Our experience and longevity in the market have resulted in a variety of deck designs.
• Open
• Enclosed
• Tubular
• Grizzly
• Power Unit Overhead
• Conveyors with Multiple Power Units
• Decks with Screen Sections

Liner Alternatives
• 235 BHN AR Plate (Standard)
• 400 BHN AR Plate
• Stainless Steel
• UHMW
• Ceramic

Rugged Construction
HP feeders are designed with the latest CAD technology and built to maintain structural integrity, as well as withstand the forces imposed by high-performance electromagnetic operation.

Control
Many control systems are available: from local manual control to automatic control, from an external signal through PLCs.

These Features Give You:
• Minimum Downtime for More Production
• Reliability
• Lower Operating and Maintenance Costs

Electromagnetic Operation

Jeffrey HP feeders operate through controlled, high-frequency vibration. This is accomplished with electrical pulses and a machine that is tuned to a mechanical resonant frequency that is higher than the electrical frequency of the power supply (sub-resonant tuning).

Electrical pulses in the coils of the encapsulated stator create a series of magnetic pulls that attract the armature and the deck. Restoring forces in the bar oppose each pull, causing the armature to spring away from the magnet or stator. At an electrical frequency of 60 cycles per second, the armature and the deck operate at 3,600 times per minute (the vibration rate of the feeder). Material is moved by a series of “jumps” that correspond to the frequency of the vibrations. The distance that the bars travel can be changed by varying the power to the stator. With this variation in the length of each “jump,” or vibration amplitude, the conveying speed of the material on the feeder deck changes, resulting in a capacity rate that fits your requirements.

Feeder Control

The electrical controllers for our HP feeders are designed around halfwave rectification of AC power. The efficient switching mechanism of silicon-controlled rectifiers produces DC impulses without wasteful resistor or rheostat energy loss. Plus, it provides a full 0 - 100% range of control. A programmable microprocessor will define your specific requirements with only two, clearly labeled adjustments. All controllers comply with NEMA design standards.

The control cabinet has a 115-volt push button for the magnetic contactor, which is in accordance with current NEC requirements. A separate control transformer is provided.

The solid-state control circuit includes a “soft-start” feature. A regulator, requiring no additional connection to the feeder(s), maintains vibration to within ± 0.002", provided the line voltage variations do not exceed + 5% and the line frequency is ± 0.5 Hz.

Manual or process variable controllers are available. There are also variations of these two basic arrangements. These include simultaneous, proportional, and sequential control for several feeders; HI/LO switches for batch weighing or filling operations; AMP demand control that affords efficient and effective feed to process machinery, such as size reduction equipment; and over-stroke protection.

Process Variable Control

Any process variable input transmittable in small current signals can automatically increase or decrease material flow.

Manual Control

Vary the flow from 0 - 100% with a stepless potentiometer.  Install the control cabinet at a local or remote location.

For the best performance and longest life, order your Feeder parts from Jeffrey, and count on Jeffrey Technical Services for field service, training and repairs. Even before you buy, Jeffrey supports you with a free material test in the Jeffrey Test Lab. You can request a material test online.

Retrofit Your HP Feeder

Now you can retrofit your HP Feeder to the latest EF Feeder techology.

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