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)
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.
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.
| 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 |
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.
Describe your task and we'll advise which drive type fits your material and required capacity best.