An electromagnetic drive (PEV) and a motor-vibrator are the two main ways to drive a vibrating feeder. Both solve the same task — feeding bulk material evenly from a hopper or onto a process line — but they are built on fundamentally different principles, which decides where each one pays off technically and economically.
Electromagnetic drive (PEV)
In an electromagnetic drive the oscillation comes from an electromagnet pulling an armature across an air gap, so No rotating parts — no rotor, bearings or eccentrics — so maintenance is limited to periodic fastener checks and inspecting the rubber vibration isolators. Capacity is adjusted smoothly from zero to maximum by changing the coil voltage through a control unit. The feeder can even start under a full hopper, effectively acting as a hopper gate — a key advantage where the unit needs to dose material, not just convey it.
The size range of electromagnetic feeders covers a wide span of duties: from 4 m³/h on a 200 × 600 mm tray up to 300 m³/h on a 1500 × 2500 mm tray, with permissible lump sizes from 36 to 400 mm. Control is by a ШУВ cabinet or a БУВ unit, which vary the coil voltage and set output from zero to maximum; versions with a vibration sensor hold the amplitude steady as the bulk density of the material changes. Details of the available versions are on the control units page, and the full size range is in the PEV feeder catalogue.
Motor-vibrator feeders
Operate in a far-resonant mode, which increases feed stability when material properties vary (moisture, particle size) — amplitude depends less on tray loading than with resonant electromagnetic schemes. Requires bearing maintenance on the motor-vibrator, so the quality of the unit itself matters: imported units (e.g. Italian) last noticeably longer than domestic equivalents, but cost more, and replacing an overseas motor-vibrator takes longer than sourcing a Russian-made PEV drive.
Which motor-vibrator you pick matters more than it might seem: service life differs markedly between domestic and imported units, and when an imported vibrator fails, the lead time for a replacement is longer than for a Russian-built electromagnetic drive. Smooth control is possible but needs a variable-frequency drive — a separate device in the cabinet — whereas an electromagnetic drive needs a regulator in any case and it comes as part of the delivery. More on these feeders is on the motor-vibrator feeders page.
Criterion-by-criterion comparison
| Criterion | Electromagnetic drive (PEV) | Motor-vibrator |
|---|---|---|
| Rotating parts | none | yes (rotor, bearings) |
| Capacity control | smooth, 0–100% | stepped or frequency-based (VFD needed) |
| Starting under a full hopper / gate function | yes | limited |
| Maintenance | minimal | scheduled bearing lubrication/replacement |
| Stability with variable material | good | higher, due to far-resonant operation |
| Large single-unit capacity | limited by the size range | easier to scale with synchronized units |
| 5–7 year cost of ownership | lower (no bearing consumables) | higher with imported units |
Three situations where the choice is obvious
Metering as part of a weighing station. You need smooth delivery from zero and repeatability cycle to cycle — that is electromagnetic drive territory: output changes with coil voltage, with no intermediate mechanism and no VFD.
Starting under a full hopper. An electromagnetic feeder starts under a column of material and effectively acts as the chute gate. A motor-vibrator is limited in this duty, and the station then needs a separate gate.
Material with strongly variable moisture and grain size. Here far-resonant operation of a motor-vibrator wins: amplitude depends less on tray loading, and feed stays steady where a resonant scheme would need re-tuning.
Where to start the selection
Drive type is the second question, not the first. Start with the duty: required capacity in m³/h, lump size, bulk density and moisture of the material, tray width and length allowed by the site, duty cycle, and how the feeder will be controlled — by hand, remotely, or by a signal from the plant control system. The same data determines the size: lumps up to 90 mm are covered by 500 mm wide models, up to 160 mm by 700 mm models, up to 320 mm by 1200 mm models. Once those are known, the choice between an electromagnetic drive and a motor-vibrator usually comes down to two questions: is starting under a full hopper required, and how stable are the material properties.
If the material is uniform in moisture and fraction and the feeder has to meter precisely with minimal maintenance, an electromagnetic drive covers the duty outright. If the properties vary widely, or you need a single-unit capacity above the top of the size range, a motor-vibrator is worth considering — and at that point it is worth comparing two specific solutions against your figures rather than drive types in the abstract.
Which to choose
For most industrial tasks with regular automatic capacity control and a preference for minimal maintenance, we recommend an electromagnetic drive — our core product range (44 PEV sizes and 8 VEM vibro-drives). Motor-vibrator feeders make sense when you need extra feed stability with strongly variable material properties, or a large single-unit capacity that is easier to reach by synchronizing a pair of motor-vibrators than with an electromagnetic drive.
Frequently asked questions
Can a motor-vibrator be swapped for a PEV drive on an installed feeder?
No. These are different structural schemes for the tray and the drive mounting, so the change is possible only when designing a new station, not as a retrofit of an existing one.
Which drive is quieter?
With a correctly chosen amplitude and sound vibration isolators, an electromagnetic drive is usually quieter, because there is no bearing assembly with its characteristic hum at speed.
Does an electromagnetic feeder need a variable-frequency drive?
No. Output is set by varying the coil voltage through a ШУВ cabinet or a БУВ unit, and that regulator is part of the feeder delivery. It is the motor-vibrator feeder that needs a VFD if smooth control is required.
Which is cheaper to run over several years?
An electromagnetic drive has no bearing assembly, so there are no consumables and no scheduled lubrication — servicing comes down to tightening fasteners and inspecting the isolators. A motor-vibrator feeder adds bearings and their scheduled replacement to the cost of ownership, plus spare-part lead times for imported units.
Describe your task via the request form and we'll advise which drive type fits your material and required capacity best.