Vibrating Motors / Unbalanced Vibrating Motor / Unbalanced Vibratory Motor
A vibrating motor is the heart of every vibratory feeder, screen, table, and furnace charger. Mitool Equipments manufactures heavy-duty unbalance-type vibrating motors — totally enclosed, 3-phase squirrel cage induction motors with adjustable eccentric weights mounted on extended shafts that convert rotational energy directly into useful mechanical vibration.
Used singly or in pairs across feeders, screens, tables, fluidising units, bin activators, and de-stickers, Mitool vibrating motors are built with carefully sized bearings to withstand the heavy radial loads imposed by eccentric weights, and rugged frames to survive 24×7 service in dusty, hot industrial environments.
How an unbalance vibrating motor works
A standard induction motor has its shaft balanced. In a vibrating motor, the shaft is extended at both ends and fitted with eccentric weight stacks. When the motor runs, these weights generate a centrifugal force that vibrates the entire motor body — and any structure bolted to it. Two motors mounted parallel and rotating in opposite directions cancel horizontal forces and leave only a strong linear vibration. This is the principle behind every electromechanical vibrating feeder, linear motion screen, and furnace charger that Mitool builds.
Construction
• Frame: high-tensile cast iron or fabricated steel, ribbed for rigidity
• Stator: copper-wound, Class F or Class H insulation
• Rotor: squirrel-cage, balanced before eccentric weight assembly
• Bearings: heavy-duty roller bearings sized for radial load from eccentric weights — much higher capacity than standard motor bearings
• Eccentric weights: stack-adjustable on both shaft ends; vibration amplitude varied by adjusting weight angle
• Enclosure: IP65 standard
• Terminal box: heavy gauge, with double cable entry, designed for vibration-resistant termination
Vibrating motor specifications
| Parameter | Range |
|---|---|
| Type | 3-phase squirrel cage induction with adjustable eccentric weights |
| Centrifugal force range | 100 N – 30,000 N (custom higher available) |
| Speed (synchronous) | 750 / 1000 / 1500 / 3000 RPM (2 / 4 / 6 / 8 pole) |
| Voltage | 415 V, 3-phase, 50 Hz (other voltages on request) |
| Insulation class | F (Class H available) |
| Protection class | IP65 standard |
| Mounting | Foot-mounted, 4-bolt, 6-bolt and 8-bolt standard pattern |
| Bearing | Heavy-duty roller, designed for full centrifugal load |
| Duty cycle | S1 — continuous |
Industries & applications
• Vibratory feeders: single motor or paired counter-rotating pair
• Linear motion screens: paired motors at fixed angle
• Vibrating tables: compaction of concrete, mould packing
• Furnace chargers: feeding scrap or charge material into furnaces
• Bin activators & de-stickers: preventing arching and bridging in hoppers and silos
• Fluidising units: agitating powders in storage tanks
• Spiral elevators & vibrating conveyors: vertical and horizontal bulk material transport
Key advantages of Mitool vibrating motors
• Adjustable vibration amplitude: stack weights can be repositioned without dismantling the motor
• Long bearing life: premium roller bearings selected for full centrifugal load — typically 30,000+ running hours
• Robust for dusty environments: IP65 enclosure prevents fines ingress in steel mills, foundries, cement plants
• Wide centrifugal-force range: from compact 100 N units for fine-bin activators to 30,000 N+ units for heavy feeders
• Easy spare-part support: common bearings and weight kits stocked at Ambernath
Frequently Asked Questions
A. A normal motor has a perfectly balanced rotor and produces only rotational torque. A vibrating motor has eccentric weights bolted to extended shaft ends, deliberately producing centrifugal vibration. The bearings, frame, and shaft are specifically engineered to withstand the resulting radial loads.
A. Each shaft end has a stack of eccentric weight plates. You loosen the locking bolt, rotate the outer weights relative to the inner ones to change the effective centrifugal force, then re-tighten. This adjustment is performed with the motor switched off and locked out.
A. As a thumb rule, the total centrifugal force should be 4–5 times the weight of the vibrating mass (tray plus material). Share your tray dimensions and material density, and our engineers will recommend the correct motor.
A. Standard units are IP65 protected. For explosion-hazard areas such as coal handling, flour mills, or chemical plants, flameproof Ex-d certified motors can be supplied on request.
A. With correct sizing, regular re-greasing (every 2,000–3,000 hours), and operation within the rated centrifugal load, bearing life of 25,000–30,000 hours is typical. Mitool provides a recommended greasing schedule with every motor.
