Electric Tug Motor — BLDC Gear Motor for AGV Electric Tugger and Tow Tractor
Electric tugs, AGV electric tuggers and tow tractors need a motor that delivers high torque at low speed, runs continuously without brush replacement, and fits into a compact drive unit. That is exactly what a BLDC gear motor does. This page covers how to select the right brushless DC gear motor for your electric tug application — from payload calculation to voltage selection to gearbox matching — and shows which Shenghe motor series fits each tug class.
What Is an Electric Tug and Why BLDC?
An electric tug (also called an electric tugger, electric tow tractor, or pedestrian-operated tug) is a battery-powered vehicle that pulls carts, dollies, trailers or heavy loads across a factory floor, warehouse or airport. AGV tuggers and tugger AGVs are the automated version — they follow a programmed path without a human operator.
Both types rely on one or two BLDC gear motors as their traction drive. BLDC (brushless DC) motors are the standard choice for electric tugs because they combine three properties that matter in towing applications:
- No brush wear — electric tugs run 8–16 hours per shift, often 24/7 in multi-shift factories. A brushed motor needs brush replacement every 2000–4000 hours; a BLDC motor eliminates that maintenance cost entirely.
- Flat torque curve at low speed — towing requires peak torque at startup (breakaway force) and sustained torque at 0.5–2 m/s travel speed. BLDC motors with gear reduction deliver exactly this profile.
- Compact integration — the motor + planetary gearbox + controller package fits inside the tug chassis or wheel hub, leaving maximum space for the battery pack.
Motor Selection by Electric Tug Class
| Tug Class | Tow Capacity | Voltage | Motor Power | Gearbox | Shenghe Series |
|---|---|---|---|---|---|
| Light-duty pedestrian tug | 500–1000 kg | 24V | 200–400W | Planetary 30:1–50:1 | 4GU-80 / 5GU-90 |
| Medium electric tugger | 1000–3000 kg | 24V / 48V | 400–750W | Planetary 50:1–100:1 | 5GU-90 / 6GU-104 |
| Heavy tow tractor | 3000–6000 kg | 48V | 750–1500W | Planetary 50:1–100:1 | 7GU-120 |
| AGV tugger (automated) | 1000–5000 kg | 48V | 400–2000W | Planetary / worm | 7GU-120 (dual drive) |
| Heavy-duty AGV tow tractor | 5000–50000 kg | 48V (dual) | 2 × 1000–2000W | Planetary 100:1 | Electric Tank Carrier |
How to Calculate Motor Power for Your Electric Tug
The required motor power depends on three factors: total towed load, floor surface, and target speed.
Step 1 — Determine traction force
F = m × g × μ × S
- m = total towed mass (cart + payload), kg
- g = 9.81 m/s²
- μ = rolling friction coefficient (smooth concrete: 0.02; epoxy: 0.015; rough concrete: 0.04; steel rail: 0.005)
- S = safety factor (1.3–1.5 for flat floor; 2.0+ for ramps)
Step 2 — Calculate motor power
P = F × v ÷ η
- v = target speed, m/s (typical: 0.5–1.5 m/s for warehouse tugs)
- η = drivetrain efficiency (planetary: 0.85; worm: 0.55–0.65; helical: 0.90)
Example calculation
Towing 2000 kg on smooth concrete at 1 m/s with planetary gearbox:
F = 2000 × 9.81 × 0.02 × 1.5 = 589 N
P = 589 × 1.0 ÷ 0.85 = 693W → select 750W motor (48V 750W 6GU-104)
Gearbox Selection for Electric Tugs
| Gearbox | Best for | Ratio Range | Efficiency | Self-locking |
|---|---|---|---|---|
| Planetary | Most electric tugs — best torque/size ratio | 3:1 – 500:1 | 85–92% | No |
| Worm | Tugs on ramps, incline hold | 5:1 – 60:1 | 55–65% | Yes |
| Helical/spur | Quiet indoor tugs, cleanroom | 3:1 – 1000:1 | 88–95% | No |
Controller Integration
Every Shenghe BLDC motor for electric tugs ships with a factory-matched controller. The controller handles electronic commutation (Hall sensor or sensorless), speed regulation, direction change, and regenerative braking. Interface options include 0–5V analog speed input, PWM, RS485 (Modbus) and CAN bus for AGV tugger integration. Motor and controller are tested together on a dynamometer before shipping — no field tuning needed.
Why Source Electric Tug Motors from Shenghe
Motor + Gearbox + Controller
Complete drive package from one factory. No cross-vendor compatibility issues.
In-house CNC + Assembly
20CrMnTi case-hardened gears (HRC 58–62), AGMA Q9–Q11. Full traceability from raw material to finished motor.
OEM Ready
Custom shaft, flange, ratio, voltage, controller interface. MOQ 50. Sample 7–10 days, production 2–3 weeks.
Frequently Asked Questions
What motor is used in an electric tug?
Electric tugs use BLDC (brushless DC) gear motors, typically 24V or 48V, 200W to 2000W. The motor is paired with a planetary or worm gearbox for high torque at low speed. BLDC is preferred over brushed DC because it requires zero brush maintenance in continuous-duty towing applications.
How do I calculate the motor power for my electric tug?
Required power = (total towed mass × 9.81 × friction coefficient × safety factor × target speed) ÷ drivetrain efficiency. For 2000 kg on smooth concrete at 1 m/s with planetary gearbox: approximately 700W. See the full calculation above.
What is the difference between an electric tug and an AGV tugger?
An electric tug is manually steered by a walking operator. An AGV tugger follows a programmed path automatically. Both use the same BLDC gear motor for traction — the AGV adds navigation sensors, safety scanners and a PLC layer.
Which gearbox is best for an electric tug?
Planetary for most tugs (best torque/size). Worm for ramp/incline applications (self-locking). Helical for quiet indoor/cleanroom tugs.
Can I get a custom motor for my tug design?
Yes. Shenghe is vertically integrated — CNC, winding, gearbox, controller, test bench all in-house. Custom shaft, flange, ratio, voltage and controller interface. MOQ 50 for custom mods, project-based for full ODM.
Need a BLDC Motor for Your Electric Tug?
Tell us your tow capacity, speed, voltage preference and quantity. Engineering team replies within 24 hours with motor recommendation and FOB Ningbo pricing.