Drives for packaging machinery: servo drives, gear motors and VFDs
A modern packaging line is dozens of drive axes synchronized within a millimetre and tens of milliseconds. Liquid filling lines for bottles and pouches, dry product filling, blister thermoforming and MAP packaging, carton-erecting and folding machines, inkjet coding and grouping into case packers — every operation needs its own servo drive, gearbox and VFD set. Critical factors here are a compact footprint inside a tight machine frame, start-stop dynamics up to 200 cycles per minute, and accurate torque holding during film forming.
Industry-typical tasks
- Drives for dosing and filling modules on liquid filling lines (bottles, Tetra/SIG cartons, pouches) — 0.18–3 kW per axis, positioning accuracy ±0.1 mm
- Auger and weigh fillers for dry products (flour, sugar, grains, cement in small packs) — 0.55–7.5 kW drives with VFD speed control
- Vacuum packaging machines and thermoforming lines (blister, MAP) — servo drives for film advance and heated punches, 7.5–45 kW per machine
- Carton-erecting and folding equipment — folder-gluers and rotary die-cutters, 1.5–11 kW drives with servo synchronization
- Labelling and coding lines (inkjet, laser, thermal transfer) — compact 0.2–0.75 kW servo drives for label feed and cutoff
- Case packers and strapping machines — conveyor and forming-frame drives 3–15 kW
- Palletizers and bundlers for finished packs — vertical lift and column-rotation drives 11–75 kW with brake modules
- Hydraulic power units for secondary-packaging compactor presses and balers — 7.5–22 kW pump groups
Electric motors and servo drives
In packaging the motor almost always works with a VFD or servo drive — direct on-line starting is found only on simple auxiliary drives. The main requirements are a small footprint to fit inside the line frame, low rotor inertia for 100–200 starts per minute, IP54–IP65 protection for CIP/SIP washdown zones in food packaging, and inverter compatibility (class F insulation with class B thermal margin). Servo motors are a separate class with high-resolution encoders for accurate positioning.
Servo drives for film advance and cutoff
On blister thermoforming and MAP lines the BoPP/PE film advance drives must hold speed and position accurately — a 1 mm cut error means a reject pack. Inovance ISMH/MS1H servo motors with 17–23 bit encoders deliver repeatability better than ±0.05 mm at peak torque 3× rated.
- — Power 0.4–5 kW, torque 1.3–24 N·m
- — Absolute encoder 17–23 bit
- — IP65 protection on the shaft side (oil splash, film dust)
- — EtherCAT/CANopen support for axis synchronization
Motors for product preparation pumps and mixers
Mixers for liquid products (juices, dairy drinks, sauces) and dry-blend mixers ahead of the filler use general-purpose induction motors Wolong YE3/YE4 and Huali YE3 rated 5.5–30 kW. Inverter duty requires a thermal-margin design and optionally a separate fan to maintain cooling at reduced speeds.
- — IE3/IE4 efficiency, class F insulation
- — Inverter-duty rated (NEMA MG1 Part 31)
- — Optional 24 V forced ventilation for frequencies below 25 Hz
- — IP55 minimum, stainless steel fasteners for food zones
Servo motors for palletizer column positioning
On column and robotic palletizers, servo motors lift the gripper module and rotate the column. They need high holding torque at standstill (the gripped load weighs heavy), an integrated holding brake, and high peak acceleration torque.
- — Power 3–22 kW, holding torque up to 140 N·m
- — Built-in electromagnetic holding brake
- — Peak torque 2.5–3× rated
- — STO/SS1 functional safety support
Motors for auxiliary drives
Empty-pack infeed conveyors, finished-pack discharge conveyors and CIP wash pumps are the domain of 0.18–3 kW induction motors. They typically run on INVT GD20/GD200A VFDs for line-rate speed control.
- — Power 0.18–3 kW, IE3
- — IP55, self-fan ventilation
- — Inverter compatibility (1:20 speed range)
- — Optional PTC thermistors in the windings
Gear motors and gearboxes
Packaging lines call for compact gear motors in R (helical inline), F (parallel-shaft flat), K (helical-bevel) and S (helical-worm) series. The main criteria are a small mounting envelope to fit inside the line frame, low noise (< 70 dB(A)) for clean rooms, and inverter/servo compatibility. A service factor of 1.2–1.5 is usually sufficient because the load is steady with no shock peaks.
Gear motors for filling-line conveyors
Boneng R- and F-series gear motors drive chain and slat conveyors for bottles, cartons and pouches. The inline (R) version saves space on narrow lines; the parallel flat (F) version suits overhead mounting above the belt. Ratios 5–200 cover typical conveyor speeds of 0.1–1.5 m/s.
- — Torque 50–1,500 N·m
- — Ratio 5–200
- — Service factor at least 1.3
- — Paint suitable for food zones (epoxy enamel option)
Gear motors for dry-product fillers and augers
Auger fillers for flour, sugar and small-pack cement need accurate speed control at 5–60 rpm and steady torque against startup jams. Boneng K-series (helical-bevel) gear motors with a flanged output for standard auger and an optional anti-reverse backstop are a good fit.
- — Torque 200–3,000 N·m
- — Low output speed 5–60 rpm
- — Reinforced bearings for radial auger loads
- — Compatible with anti-reverse backstop coupling
Gearboxes for thermoforming and carton machines
Folder-gluers and rotary die-cutters use industrial Boneng HB and parallel F-series gearboxes rated 7.5–45 kW. The high frequency of start-stop cycles (up to 60 per hour) calls for an S4-duty thermal check and a 30 % thermal-power margin.
- — Torque 500–10,000 N·m
- — Thermal margin for S4 duty (60 cycles/h)
- — Low noise < 72 dB(A)
- — Brake-motor mounting option
Gear motors for palletizer columns
Vertical lift and column rotation on a palletizer use 11–75 kW gear motors with a built-in brake and an anti-reverse backstop to prevent self-lowering of the load. Boneng HB-series in combination with a Huawu motor and brake forms a complete drive train with redundant safety.
- — Torque 3–25 kN·m
- — Built-in brake at 100 % of rated torque
- — Anti-reverse backstop
- — Encoder support for absolute positioning
Worm gear motors for auxiliary drives
Labelling and coding modules, label web feeds and cutoff knives use compact worm S-series gear motors rated 0.18–1.5 kW. Their advantages are self-locking on power loss and low noise.
- — Torque 10–200 N·m
- — Self-locking (ratio > 30)
- — Compact flange mounting
- — Noise level < 65 dB(A)
Brakes, couplings and power feeds
Three classes of auxiliary components matter for packaging lines: brakes for palletizer lift sections (safety on power loss), compact couplings between motor and gearbox or pump, and flexible power feed systems — busway conductor rails and cable reels — for moving line modules (overhead transfer cars, turntables, mobile palletizers).
Brakes for palletizer vertical axes
Huawu YPZ2 thrustor disc brakes are mounted on the lift winch drum of a palletizer column. Engaging within 0.1–0.2 s on power loss, they prevent the gripper module and a load up to 200 kg from dropping.
- — Braking torque with a 1.75 margin over rated lift torque
- — Engagement time on power loss ≤ 0.2 s
- — IP55, ambient temperature up to +50 °C
- — Limit switch for pad wear monitoring
Compact motor-gearbox and motor-pump couplings
Yongjing LX (LMC) flexible pin couplings with elastic bushings connect motors to auger fillers, CIP pumps and press hydraulic units. They damp startup shock loads and absorb small misalignment after thermal expansion.
- — Torque 5–500 N·m
- — Radial misalignment compensation 0.2–0.5 mm
- — Standard bore diameters 19–55 mm
- — NBR/polyurethane elastic elements, 30,000 h service life
Busway conductor rails for flexible packaging lines
Lines with moving sections (overhead transfer cars between palletizers, turntables, mobile palletizers) use Anneng SAFE-Conductor 4–6 pole busways rated 100–200 A for reliable power feed without a trailing cable. The IP23 enclosed housing protects against accidental contact and dust.
- — Current 100–200 A, 4–6 poles
- — IP23 minimum, enclosed housing
- — Section length up to 200 m, thermal expansion compensation
- — Sliding collector with carbon brushes, 5,000 h service life
Cable reels for moving line modules
Mobile line sections and turntables with 5–30 m travel use Anneng spring-driven and motor-driven cable reels. Selection is by reel type — spring-driven for light cables up to Ø25 mm, motor-driven for heavy cables or longer travel.
- — Wind length 5–30 m
- — Cable diameter up to Ø50 mm
- — Travel speed up to 60 m/min
- — Slip rings for control signal transmission (optional)
Electronics, hydraulics and heat exchange
Beyond purely mechanical components, packaging machinery relies on extensive electronics — VFDs for conveyor and pump speed control, servo controllers for axis synchronization, PLCs and HMIs for recipe management. Plus hydraulic power units for secondary-packaging presses and heat exchangers for pasteurization circuits ahead of the filler and for cooling thermoforming punches.
VFDs for filling and dry-product conveyor speed control
INVT GD20/GD200A frequency inverters rated 0.4–22 kW deliver soft starts and accurate speed control for pack infeed. Sensorless vector control holds torque at low speeds — critical to prevent overfill on a line stop.
- — Power 0.4–22 kW, 380 V
- — V/f and SVC vector control
- — Built-in PID controller (for line-rate sensor sync)
- — Modbus RTU/CANopen for line PLC connection
Servo systems for accurate pack positioning
Inovance SV660/IS810 servo drives with EtherCAT support are used for BoPP/PE film advance on thermoforming lines, folder-gluer synchronization and accurate label cutoff. Multi-axis synchronization for up to 32 axes in one control loop, 250 µs cycle time.
- — Power 0.4–7.5 kW per axis
- — EtherCAT support, cycle time ≤ 1 ms
- — Electronic cam for synchronization with a master axis
- — Integration with Inovance AM600/AC800 PLCs
Hydraulic power units for compactor presses
Secondary-packaging presses (paper, film and PET-flake balers), hydraulic case compactors and carton-tray forming presses are served by Donly hydraulic power units rated 7.5–22 kW with vane and gear pumps. Standard pressure 16–25 MPa, 30–60 s pressing cycle.
- — Power 7.5–22 kW
- — Pressure 16–25 MPa
- — 100–250 L tank with heat exchanger
- — Proportional valves for pressing-force control
Heat exchangers for thermoforming and pasteurization lines
Ahead of the filler the product often goes through pasteurization or cooling in Deo plate heat exchangers. On thermoforming lines, heat exchangers cool the supply water for forming punches (from +12 °C inlet) and heat the supply water for heating plates up to +180 °C.
- — Plate design, AISI 316L for the food side
- — Thermal capacity 50–500 kW
- — Food-grade EPDM gaskets (FDA)
- — Demountable construction for CIP cleaning
Applications gallery
Our solutions for this industry
SDS portfolio brands that cover typical applications in this industry.
- BONENGcompact R/F/K/HB gear motors for filling and packing lines, auger fillers, carton folder-gluers and palletizer columns
- WOLONGcompact YE3/YE4 induction motors for mixers and pumps, plus servo motors for lines that require accurate positioning
- HUALIgeneral-purpose YE3 motors for auxiliary conveyor drives, CIP pumps and discharge conveyors
- INOVANCESV660/IS810 servo systems for accurate pack positioning and BoPP/PE film advance — the key brand for thermoforming and MAP
- INVTGD20/GD200A frequency inverters for filling-conveyor, dosing-auger and mixer-pump speed control
- ANNENGSAFE-Conductor busways and cable reels for flexible packaging lines with moving sections
- HUAWUYPZ2/YWZ5 thrustor brakes for palletizer and bundler lift sections
- YONGJINGcompact LX (LMC) flexible pin couplings for connecting motors to gearboxes, pumps and auger fillers
- DONLYhydraulic power units for secondary-packaging compactor presses, balers and carton-tray forming presses
- DEOAISI 316L plate heat exchangers for pasteurization circuits ahead of the filler and for cooling thermoforming punches
Image credits: AlfvanBeem (CC0) · KUKA Roboter GmbH, Bachmann (Public domain) · MSDN.WhiteKnight (CC0) · M5s (CC BY-SA 4.0) · Jwallingford1 (CC BY-SA 3.0)