AGV駆動システム: 仕組み, 種類 & ホイールドライブガイド
簡単な回答
What Is an AGV Drive System?
アン AGV drive system is the integrated assembly of mechanical and electrical components that generates and controls vehicle motion. It is the subsystem that answers three questions for every AGV: how fast, how precisely, and how reliably can the vehicle move? While navigation software decides どこ to go, the drive system is what physically executes the motion—and its quality determines traction, 位置決め精度, battery life and long-term reliability.
Core components of an AGV drive system
| Component | 関数 | Typical AGV specification |
|---|---|---|
| 駆動モーター | Converts electrical energy into rotational torque | BLDC or servo, 24–48 V DC, 50 W–1.5 kW per wheel, efficiency ≥85% |
| ギアボックス / ギア減速機 | Reduces speed, multiplies torque to wheel level | 惑星 20:1–40:1, 92ステージごとに -97% |
| Drive wheel | Transfers motor torque to the floor as traction | PU-coated, Ø125–300 mm, IP54+ |
| Electromagnetic brake | Holds the vehicle on slopes and during power loss | 6–24 N·m holding torque, 24 ワシントンDCで |
| エンコーダ / フィードバック | Reports speed & position for closed-loop control | 1,000–4,096 PPR (モーター) or 24-bit absolute (サーボ) |
| Motor driver / コントローラ | Executes PWM/FOC commands from the navigation system | CANopen / EtherCAT, field-oriented control |
A modern AGV wheel drive typically integrates all of the above into a single modular unit, which simplifies integration and improves consistency across a fleet. 私たちのを参照してください complete motor selection guide for how these parts map to vehicle requirements.
How an AGV Drive System Works (ステップバイステップ)
The drive system executes a closed power-and-information loop. For a single driven wheel, power flows in six stages:
1. Battery → Controller
The battery pack (通常 24/36/48 V Li-ion) feeds a DC-DC stage and the motor driver. The controller regulates voltage and current and shapes the PWM or sinusoidal output.
2. Controller → Motor
For a BLDC, the driver runs field-oriented control (FOC): it commutates the three phases based on rotor position from Hall sensors or an encoder, delivering smooth torque across the speed range. For a servo, the same principle applies with tighter bandwidth.
3. Motor → Gearbox
The high-speed, low-torque motor shaft enters the gearbox. A planetary reduction of i = 20:1–40:1 drops speed and multiplies torque. Efficiency per stage is 92–97% for planetary, versus 50–85% for worm gears—a critical difference for battery vehicles.
4. Gearbox → Drive Wheel
The output shaft turns the wheel. Tractive force at the contact patch is F = T_wheel / r, どこ r is the wheel radius.
5. Wheel → Floor
The wheel grips the floor through friction (μ). Required preload must satisfy μ · F_N ≥ F to avoid slip—this is why floor condition and wheel material matter.
6. Encoder → Controller (closed loop)
The encoder feeds wheel speed and position back to the controller for speed regulation (error typically <1%) and dead-reckoning odometry between absolute navigation fixes. This loop is what lets an AGV hold ±1–5 mm accuracy.
Read our pillar guide on “AGVとは” to see how the drive system sits inside the full vehicle architecture.
Drive Topology Comparison Table
Three drive topologies cover virtually all warehouse and factory AGVs. The table below contrasts them on the parameters engineers weight most.
| パラメーター | Differential Drive | Steering Drive | Omni-Directional |
|---|---|---|---|
| Steering method | Left/right speed difference | Rotating drive module (0–360°) | Mecanum / omni wheel rollers |
| Turning radius | Zero (in-place spin) | Zero | Zero + lateral |
| 位置決め精度 | ±2–5 mm | ±0.1–1 mm | ±1–3 mm |
| Installation height | 低い (≥100 mm) | より高い (≥200 mm) | 中くらい |
| 相対コスト | 最低 (30–50% less) | 2–3× differential | Highest |
| Best AGV type | AMR, light tugger, AGC | Forklift AGV, heavy-load | Dense-shelf, cross-dock |
Integrated wheel drive unit comparison
| Unit type | モーター + ギアボックス | Typical torque | Key advantage |
|---|---|---|---|
| Integrated steering wheel | BLDC + 惑星の, rotating module | 10–70 N·m | Steer + drive in one, コンパクト |
| Differential wheel pair | 2× BLDC + 惑星の | 5–40 N·m each | Lowest cost, 単純なコントロール |
| Hub / wheel motor | BLDC in wheel rim | 20–100+ N·m | Zero footprint, 高いトルク密度 |
| Mecanum module | 4× BLDC + ローラー | 5–25 N·m each | True omnidirectional motion |
エンジニアリングデータ: 効率, Duty Cycles & トルクの計算式
IEC 60034-1 duty cycle mapping for AGVs
IEC 60034-1:2022 defines ten duty types (S1～S10). Most AGVs operate under S3 また S4; S1 applies only to 24/7 conveyor-style vehicles. The table below maps each class to AGV reality.
| IEC class | Thermal behavior | AGV application | Torque derating |
|---|---|---|---|
| S1 | Reaches thermal equilibrium | Conveyor-style AGV, 24/7 ライン | None — rated = continuous |
| S2 | Cools fully between runs | Batch transport, long idle | 1.5–2× S1 for short bursts |
| S3 | No cooling between cycles | Goods-to-person AMR, pick-and-place | By duty factor % (ED) |
| S4 | Starting losses included | Frequent start-stop feeder AGV | 10–20% below S1 |
| S5 | Electric braking heat added | AGV with regen braking on ramps | Braking energy must be managed |
| S6 | 継続的, load/unload alternates | Rolling mill-style continuous AGV | By load duration factor |
IEC 60034-30-1 efficiency classes & NEMA mapping
| IEC class | NEMA equivalent | Loss vs previous band | AGV relevance |
|---|---|---|---|
| IE1 | 標準 | — | Avoid—wasted battery |
| IE2 | 高効率 | −10% loss | Legacy only |
| IE3 | プレミアム (MGはありません 1 テーブル 12-12) | −10% loss | Minimum for new AGVs |
| IE4 | スーパープレミアム | −15% loss vs IE3 | 欧州連合 2023+ & US 2027 mandate |
| IE5 | — (ultra-premium) | −20% loss vs IE4 | Emerging, VSD-coupled |
MGはありません 1-2021 §12.58 permits a 20% tolerance on guaranteed losses; EU 2024/1834 ecodesign regulation and the US DOE 10 CFRパート 431 (IE4 from 2027) set the legal floors. For AGV fleets, every efficiency band saved is extra battery runtime.
Core torque & speed formulas
| 量 | 式 | 注意事項 |
|---|---|---|
| Wheel output torque | T_wheel = T_motor × i × η_gear | Planetary η ≈ 0.85–0.95 |
| Traction force | F = T_wheel / r | Single wheel; ×2 for dual drive |
| Max speed | V = 2π · r · n_motor / i | n in rpm, r in m |
| RMS torque (S3/S4) | T_rms = √(Σ T²·t / Σ t) | Must < motor continuous rating |
| Adhesion limit | μ · F_N ≥ F | Dry epoxy μ≈0.75, wet μ≈0.35 |
作業例 (per Bicontrols AGV selection method)
モータートルク 0.4 N・m, ギア比 30:1, gear efficiency 0.85, wheel radius 65 んん:
- Wheel torque
T_wheel = 0.4 × 30 × 0.85 ≈ 10.2 N·m - Single-wheel traction
F = 10.2 / 0.065 ≈ 157 N - Max speed
V = 2π × 0.065 × 2500 / 30 ≈ 34 m/min (0.57 m/s)
This is the order of magnitude a 300–500 kg AMR needs. 私たちのを使用してください AGV motor torque calculation guide と how-much-torque guide for payload-specific numbers.
Manufacturer benchmark data
| サプライヤー | 製品 | Key data | ソース |
|---|---|---|---|
| マクソン | MW 500 wheel drive | ≤500 kg/wheel, 11.4–23.7 N·m cont., 30–48V, IP54, 1024 cpt | Maxon mobility PDF |
| マクソン | IDX 56 統合された | 471–794 mNm, IP65, 24/48 V, FOC | maxon IDX |
| ファールハーバー | DualGear (BX4 + GPT) | 32 mm BLDC + 2 planetary heads, 18 N·m cont. / 25 N·m int. | Faulhaber CTE |
| ファールハーバー | GPT planetary gearhead | ≤18 N·m cont. で 42 mm dia. | Faulhaber manual |
| 安川 | Sigma-7 SGM7D | 1.3–240 N·m, 30–360 rpm, 24-bit encoder, 3.1 kHz bw, 350% overload 3–5 s, STO SIL3 | Yaskawa BL.Sigma-7.01 |
Best Applications by Drive Type
| 無人搬送車 / scenario | Recommended drive | なぜ |
|---|---|---|
| Goods-to-person AMR (50–300 kg) | Differential BLDC | Lowest cost, zero-radius, sufficient accuracy |
| Forklift / pallet AGV (>1 t) | Steering drive servo | ±0.1° heading, heavy traction, compact lift |
| Heavy transfer cart (3–5 t) | Dual steering or 4× hub | Torque distribution, no skid |
| Dense-shelf cross-dock | Omni (Mecanum) | Lateral move in tight aisles |
| Conveyor / line-fed AGV | Differential, S1 duty | 継続的 24/7, 単純なコントロール |
| アウトドア / rough floor | Steering drive, IP65, larger wheel | Traction on uneven surfaces |
Match the vehicle first in our types of AGVs guide; then size the drive to the duty cycle.
7-Step AGV Drive System Selection Guide
- Define the load. Total mass (chassis + payload). Light ≤300 kg, medium 300–800 kg, heavy ≥750 kg. This sets motor power (100 W / 200–400 W / 750 W+).
- Fix target speed & 加速度. Industrial AGVs run 30–60 m/min. Higher speed needs more power and better thermal management.
- Pick the topology. Differential for cost, steering for precision, omni for flexibility (see comparison table).
- Choose motor + ギアボックス. BLDC or servo at 24–48 V, 惑星の 20:1–40:1, output torque 5–200 N·m. 確認する
T_rms < T_continuous. - Size the wheel & ブレーキ. Wheel Ø125–300 mm; electromagnetic brake ≥6 N·m for slope/parking hold.
- Set feedback & bus. エンコーダ 1,000+ PPR (or 24-bit absolute for servo); CANopen / EtherCAT to match the controller.
- Validate thermal & コンプライアンス. Confirm IEC 60034-1 duty class and IE3/IE4 efficiency; specify IP54 (IP65 for real-world >12-month deployment).
For speed/RPM trade-offs, 私たちのを参照してください AGV motor speed and RPM guide, and for efficiency vs battery life our 効率 & battery runtime guide.
よくあるエンジニアリングの間違い
| 間違い | 結果 | Correct approach |
|---|---|---|
| Sizing on peak (カタログ) torque only | Thermal trip after 15–30 min | Size on RMS torque over the duty cycle |
| Using worm gearbox to save cost | 30% energy lost as heat | Use planetary (92ステージごとに -97%) |
| Ignoring floor friction μ | Wheel slip on ramps | Verify μ·F_N ≥ F; add preload |
| Under-specifying encoder | Odometry drift, poor docking | ≥1,000 PPR or 24-bit absolute |
| No brake on slope applications | Roll-back on power loss | Spec electromagnetic holding brake |
| Mixing duty classes | Overheating under S3/S4 | Match motor to IEC 60034-1 class |
| Skipping IP rating | Bearing/winding failure | IP54 min, IP65 for real environments |
| Wrong voltage bus | Cable loss, motor heat | Match 24/36/48 V to battery |
| Neglecting inertia match | Oscillation, step loss | Keep J_load/J_motor < 10:1 (サーボ) |
| Buying on unit price alone | 3× downtime cost | Evaluate 5-year TCO & 信頼性 |
トラブルシューティング表
| 問題 | 考えられる原因 | 解決 | Topology |
|---|---|---|---|
| AGV stalls on ramp | Insufficient continuous torque | Resize motor / lower gear ratio | All |
| Wheel slip at start | μ·F_N < ふ | Increase preload, softer accel ramp | All |
| Position overshoot | Encoder resolution too low | Upgrade to 24-bit absolute | 操舵 / サーボ |
| Overheat in 20 分 | RMS > continuous rating | Larger frame or better duty match | All |
| Uneven tracking | Wheel diameter mismatch | Match wheels, recalibrate | Differential |
| Chattering on turn | Steering encoder offset | Re-zero absolute encoder | 操舵 |
| Battery drains fast | Worm gear / low IE class | Switch to planetary + IE4 | All |
| Can’t move laterally | Wrong roller angle (Mecanum) | Verify 45° roller fit | Omni |
| Brake won’t hold | Brake torque < slope load | Spec higher holding torque | 操舵 / 重い |
| Comms drop under load | Bus noise / EMI | Shield CAN/EtherCAT, ferrite | サーボ |
よくある質問
あ: Differential drive (two driven wheels turn by speed difference), steering drive (an integrated rotating module steers and propels), and omni-directional drive (Mecanum or omni wheels for lateral movement). Differential is cheapest; steering offers the best precision; omni is the most flexible but costliest.
あ: Most AGV wheel drives use a BLDC or low-voltage servo motor coupled to a planetary gearbox. Typical spec: 24–48 V DC, 50 W–1.5 kW per wheel, 5–200 N·m continuous torque, IP54 minimum, と 1,000+ PPR encoder for odometry.
あ: 出力トルク
T_wheel = T_motor × i × η_gear. Traction force F = T_wheel / r. Required torque must cover rolling, slope and acceleration resistance plus a 1.2–1.5× safety factor. 私たちのを参照してください AGV motor torque calculation guide for the full method.あ: Most AGVs run under S3 (intermittent periodic) or S4 (intermittent with starting). S1 applies to 24/7 conveyor-style AGVs. The motor’s RMS torque over the full cycle must not exceed its S1 continuous rating or it overheats.
あ: Differential is simpler and 30–50% cheaper but needs more floor space for turning. Steering drive gives ±0.1° heading control, zero turning radius and compact integration, ideal for forklift and heavy-load AGVs. Choice depends on precision, space and budget.
あ: Planetary gearboxes give the highest torque density for a given diameter (92–97% efficiency per stage), coaxial inline assembly and low backlash—critical when the motor-gearbox-wheel unit must fit a tight AGV chassis. Worm gears lose 30% of input energy to heat and are avoided for battery vehicles.
Why Choose GreenSky Power?
GreenSky Power has designed and manufactured motion solutions for AGV and AMR builders since 2011, serving OEM customers in 50+ 国. For your AGV drive system, 私たちが提供します:
| Capability | What you get |
|---|---|
| Full architecture coverage | Differential, steering and omni wheel drive units from one supplier |
| Motor platforms | BLDC, DC servo and stepper, 12–72 V, 22–120 mm frame |
| Gearbox lineup | 惑星, ワーム, parallel-shaft, right-angle — matched to duty |
| エンジニアリングサポート | Send mass/speed/accel/grade/wheel dia → get a calculation sheet |
| 規格への準拠 | Tested per IEC 60034-1; dynamometer report per batch |
| Thermal class | クラスF (155 ℃) 標準, H (180 ℃) on request |
| 効率 | IE3 / IE4 builds to meet EU & US 2027 mandates |
| Custom design | Integrated steering wheel, ハブモーター, QDD — built to spec |
Start with our motor for AGV selection guide, compare gear motor vs direct drive, or review BLDC vs servo for AGVs. Building for Europe? 私たちのを参照してください AGV motor supplier for Europe ガイド, or our OEM manufacturing guide for production.
参照
- International Electrotechnical Commission — IEC 60034-1:2022 回転電機 - 一部 1: 評価と性能. Duty cycle classifications S1–S10. https://webstore.iec.ch/publication/60796
- National Electrical Manufacturers Association — MGはありません 1-2021 モーターと発電機 (テーブル 12-12 効率, §12.58 loss tolerance). https://www.nema.org/standards/view/mg-1
- 私たち. Department of Energy — 10 CFRパート 431 Energy Conservation Program for Certain Industrial Equipment (IE4 compliance timeline to 2027). https://www.ecfr.gov/current/title-10/chapter-II/subchapter-U/part-431
- International Energy Agency — エネルギー効率 2024 / 2025 (モーター & motor systems = 53% 世界の電力の). https://www.iea.org/reports/energy-efficiency-2024
- SKF — エネルギー効率が高い (E2) deep groove ball bearings for electric motors (30–50% friction reduction). https://www.skf.com/binary/57-121274/E2-Electric-motors-offer-sheet_13279_EN.pdf
- Siemens — Digital Enterprise: Electric Motor Factory Bad Neustadt & AGV material-flow simulation (40% shorter lead time, digital twin). https://www.siemens.com/fi-fi/campaigns/digital-transformers-electronics-factory-bad-neustadt
- Maxon — Wheel Drive for AGV and AMR (MW 500) product recommendation. maxongroup.com MW 500 PDF
- Faulhaber — DualGear drive system (BX4 + GPT planetary) for autonomous logistics. https://ctemag.com/products/drive-system-for-smart-logistics
- Yaskawa — SIGMA-7 Direct Drive Servomotors (SGM7D, 24-bit encoder, 3.1 kHz bandwidth). yaskawa.com BL.Sigma-7.01
- IEEE — J. Zhao et al., “Discrete Switched Disturbance Rejection Controller for Robust Path Following of Autonomous Ground Vehicles,” IEEEトランス. Transportation Electrification, 2025, doi:10.1109/TTE.2025.3625914. https://doi.org/10.1109/TTE.2025.3625914
This article is part of the GreenSky Power AGV knowledge center. Related: AGVとは · Types of AGVs · AGV vs AMR · How to Choose a Motor for AGV.
