Cómo elegir un motor para aplicaciones AGV: Guía de selección completa

Cómo elegir un motor para aplicaciones AGV: Complete Selection Guide — Types, Torque Calculation & Specifications

Seleccionando el derecho motor for AGV (Vehículo guiado automatizado) systems is one of the most consequential design decisions in mobile robotics. The drive motor directly determines traction performance, tiempo de ejecución de la batería, precisión de posicionamiento, comportamiento térmico, and maintenance intervals — all of which feed into the total cost of ownership over a multi-year deployment.

This guide consolidates selection methodology used by AGV/AMR manufacturers worldwide. It covers motor type comparison, torque calculation formulas, gearbox matching, payload-based sizing, protección del medio ambiente, and controller integration — with reference data from industrial motor platforms.

What Is an AGV Motor?

An AGV motor is an electric motor that provides propulsion, gobierno, and lifting force for automated guided vehicles and autonomous mobile robots. Unlike industrial motors that run at fixed speeds on mains power, AGV motors operate from battery voltage (typically 24V or 48V DC), must handle frequent start-stop cycles, and require closed-loop feedback for positioning accuracy.

The motor works as part of an integrated drive system that includes a gearbox, codificador, freno, and motor controller. Each component must be matched to the vehicle’s payload, diámetro de la rueda, target speed, slope requirements, and operating environment. A mismatched motor — even one with adequate rated power — can cause overheating, wheel slip, positioning drift, or premature bearing failure.

Key Functions of an AGV Motor

AGV Motor Types: BLDC, servo, paso a paso, and Brushed DC

Four motor technologies compete in the AGV drive space. Each has distinct efficiency, costo, mantenimiento, and control characteristics that make it suitable for specific payload classes and precision requirements.

1. CC sin escobillas (BLDC) Motor — The Dominant Choice

BLDC motors have become the mainstream drive solution for AGVs and AMRs due to their combination of high efficiency (85–92%), larga vida útil (10,000–20,000+ hours), and low acoustic noise. They use electronic commutation instead of mechanical brushes, eliminating the primary wear component found in brushed motors.

Para aplicaciones AGV, BLDC motors are typically paired with planetary gearboxes to multiply torque at the wheel. The integrated BLDC planetary gear motor — where motor and gearbox are supplied as a single unit — is the most common configuration for warehouse AMRs and logistics AGVs in the 50–500 kg payload range.

Key advantages for AGV deployment:

• Eficiencia de la batería: 85–92% efficiency vs. 60–75% for brushed DC, directly extending operating time per charge
• Maintenance-free operation: No brush replacement; bearing life is the limiting factor
• Ruido bajo: 48–55 dB typical, suitable for hospital and office environments
• Closed-loop control: Compatible with Hall sensors and encoders for FOC (Control orientado al campo)
• Gestión térmica: Lower resistive losses reduce heat generation in enclosed chassis
• Compact form factor: High torque density in 42mm, 56milímetro, and 80mm frame sizes

For BLDC motor product specifications and configurations, ver nuestro Página de producto del motor BLDC.

2. DC Servo Motor — For Precision Applications

DC servo motors use closed-loop control with high-resolution encoder feedback to achieve millimeter-level positioning accuracy (repeatable error < ±0.1 mm with 17-bit absolute encoders). They offer 300% instantaneous overload capacity and superior dynamic response compared to standard BLDC motors.

Servo motors are typically specified for heavy-load AGVs (>1 ton payload), high-speed precision docking (≥2 m/s with ±5 mm stopping accuracy), and complex path control scenarios such as S-curve obstacle avoidance or synchronized multi-axis movement.

3. Stepper Motor — For Light-Load Precision

Stepper motors provide open-loop position control without encoder feedback, making them cost-effective for light-load AGVs and AGCs (Automated Guided Carts) where positioning accuracy requirements are moderate (±1–5 mm). They deliver high holding torque at zero speed and simple integration with stepper drivers.

Sin embargo, steppers lose torque rapidly at higher speeds and are susceptible to step loss under sudden load changes. Closed-loop stepper variants (hybrid steppers with encoder feedback) address these limitations for applications requiring higher reliability. For a detailed comparison of servo and stepper motor characteristics, ver nuestro Servo Motor vs Stepper Motor guide.

4. Brushed DC Motor — The Legacy Option

Brushed DC motors remain in use for low-cost AGV platforms due to their simple two-wire control and low upfront cost (30–50% cheaper than BLDC). They provide high starting torque and respond well to PWM speed control.

The trade-offs are significant: brush wear limits service life to 2,000–5,000 hours, efficiency is 60–75%, and brush arcing generates electrical noise and acoustic noise. For AGV fleets operating multiple shifts, the maintenance cost of brush replacement quickly exceeds the initial savings.

Motor Type Comparison Table

Torque Calculation for AGV Drive Motors

Torque calculation is the foundation of AGV motor selection. Estimating torque from catalog data without calculating actual wheel-side requirements leads to either undersized motors (calentamiento excesivo, parar) o motores de gran tamaño (wasted battery capacity, mayor costo).

Wheel Torque Formula

The required torque at each drive wheel is the sum of rolling resistance torque and acceleration torque:

T_rueda = (m × g × μ × r) + (m × a × r)

Ejemplo resuelto: 150 kg Warehouse AMR

Por un 150 kg AMR with 75 mm wheel radius (150 mm de diámetro), smooth warehouse floor (μ = 0.02), y 0.5 m/s² acceleration:

• Rolling resistance torque: 150 × 9.81 × 0.02 × 0.075 = 2.21 Nuevo Méjico
• Acceleration torque: 150 × 0.5 × 0.075 = 5.63 Nuevo Méjico
• Total wheel torque (two wheels): 7.84 Nuevo Méjico
• Per motor (dual drive): 3.92 Nuevo Méjico
• With safety factor 1.5–2.0×: 5.9–7.8 N·m per motor

Torque Requirements by Operating Scenario

AGV drive motors face different torque demands depending on the maneuver being performed. Data from automotive manufacturing logistics applications shows the following patterns for a two-wheel differential AGV:

The safety factor of 1.5–2.0× applied to calculated torque accounts for floor irregularities, wheel wear, payload distribution asymmetry, and transient acceleration peaks. For slope-climbing AGVs, verify that the motor can sustain the higher torque without exceeding its thermal limit over the expected climb duration.

Voltage and Power Specifications

AGV motors operate on DC battery power, with 24V and 48V being the dominant voltage platforms. The choice of voltage affects motor current draw, wiring gauge, controller sizing, and battery configuration.

Voltage Platform Comparison

Power Sizing by Load Class

When sizing motor power, verify that the motor’s continuous torque rating (not just peak torque) exceeds the calculated RMS torque over the duty cycle. Peak torque covers acceleration transients; continuous torque determines whether the motor can sustain operation without thermal shutdown.

Gearbox Selection for AGV Motors

The gearbox multiplies motor torque and reduces output speed to match wheel RPM requirements. For a motor spinning at 3,000 RPM and a wheel needing 100 RPM, a 30:1 reduction ratio is required. The gearbox type directly affects torque density, reacción, ruido, y costo.

Gearbox Type Comparison for AGV Applications

For AGV wheel drive applications, planetary gearboxes provide the best balance of torque density, durabilidad, y costo. The 5–15 arc-min backlash is sufficient for traction — sub-arc-min precision is unnecessary when the wheel itself has tire deformation of several millimeters. For a deeper comparison of spur vs planetary gear motor characteristics, ver nuestro Spur Gear Motor vs Planetary Gear Motor analysis.

Common Gear Ratios for AGV Applications

For gearbox product options compatible with AGV drive systems, ver nuestro página de producto de la caja de cambios.

Motor Sizing by Payload Class

AGV motor specifications should be selected based on the total vehicle mass (chassis + batería + maximum payload). The following matrix provides a starting point for motor selection, with specific configurations depending on drive layout (2WD vs 4WD), floor conditions, and slope requirements.

AGV Motor Selection Matrix

Nota: Payload ranges overlap because the correct selection depends on drive configuration (number of driven wheels), floor friction coefficient, maximum slope angle, and duty cycle. A 4WD configuration distributes torque across four motors, allowing smaller individual motor sizes for the same payload.

For custom motor configurations tailored to specific AGV platforms, ver nuestro servicios de motores electricos personalizados.

Environmental Protection and Noise

IP Rating Requirements

Proper sealing addresses the two most common BLDC motor failure modes in AGV service: bearing contamination and winding corrosion. For AGVs operating in food processing or pharmaceutical environments, stainless steel housings and food-grade grease may be required in addition to IP66+ sealing.

Noise Requirements

The single most effective noise reduction method is using helical (angled) gear teeth instead of straight (estimular) teeth. Ground gear profiles further reduce noise by 3–5 dB compared to powder-metal gears.

Freno, Codificador, and Controller Integration

The AGV motor does not operate in isolation — it must integrate with a brake (for safety holding), un codificador (for feedback), and a motor controller (for commutation and motion control). Mismatches between these components are a common source of AGV performance issues.

Brake Requirements

Encoder and Feedback Options

Controller Communication Protocols

AGV motor controllers must interface with the vehicle’s central control system. Common communication protocols include:

For motor controller products compatible with AGV drive systems, ver nuestro página de producto del controlador de motor.

Drive Configurations: 2WD, 4WD, Differential, and Hub

The number and placement of drive motors affects torque distribution, steering method, and motor sizing. Each configuration has different implications for motor selection.

Motor Selection Impact by Configuration

In a differential drive configuration, each motor must provide approximately half the total required wheel torque. In a 4WD configuration, each motor provides roughly one-quarter, allowing smaller frame sizes. Sin embargo, 4WD systems require tighter speed synchronization between motors to prevent wheel slip during skid steering.

Hub motor configurations eliminate the external gearbox by integrating the gear reduction inside the wheel hub. This simplifies mechanical layout but makes motor replacement more complex. For a comparison of direct drive vs gearbox approaches, ver nuestro Direct Drive Motor vs Gear Motor guide.

Seven-Step AGV Motor Selection Framework

The following framework synthesizes best practices from AGV manufacturers and motor suppliers into a structured selection process:

Paso 1: Define Vehicle Parameters

Document total mass (chassis + batería + max payload), diámetro de la rueda, número de ruedas motrices, target speed, and maximum slope angle. These parameters are the inputs for all subsequent calculations.

Paso 2: Calculate Required Wheel Torque

Apply the torque formula: T_rueda = (m × g × μ × r) + (m × a × r). Apply a safety factor of 1.5–2.0× to account for real-world conditions. Divide by the number of drive wheels to get per-motor torque.

Paso 3: Seleccionar tipo de motor

Choose BLDC for most warehouse/logistics AGVs (50–500 kilogramos). Select servo for heavy-load (>1 tonelada) or precision docking (±0.1 mm). Consider stepper for light AGCs (<100 kg) with moderate accuracy needs. See the motor types section arriba.

Paso 4: Determine Voltage Platform

Use 24V for payloads under 300 kg. Use 48V for payloads above 300 kg or when motor current at 24V would exceed 20A continuously. Verify battery configuration supports the selected voltage.

Paso 5: Select Gearbox and Ratio

Calculate required gear ratio: motor RPM ÷ required wheel RPM. Choose planetary gearbox for AGV traction (best torque density and noise). Verify gearbox continuous torque rating exceeds calculated wheel torque.

Paso 6: Specify Environmental Protection

Minimum IP54 for indoor warehouse. IP65 recommended for any AGV with >12 month deployment. IP66+ for wash-down environments. Select helical gears for noise-sensitive applications.

Paso 7: Integrate Brake, Codificador, and Controller

Specify electromagnetic brake for parking/emergency/slope holding. Select encoder resolution based on positioning accuracy requirement. Match controller communication protocol to AGV central control system (CANabierto, Modbus, EtherCAT).

Total Cost of Ownership Analysis

The lowest-priced motor is rarely the lowest-cost motor over an AGV’s deployment lifetime. A TCO analysis should consider four cost categories:

Para una flota de 50 AGVs operating 24/7, investing in higher-quality BLDC planetary gear motors typically reduces total cost of ownership by 30–50% over a 5-year deployment period compared to brushed DC alternatives. The energy savings alone — from 90% VS. 75% efficiency — can offset the higher initial procurement cost within the first 12–18 months.

For motor testing and quality validation processes that support long-life AGV deployment, ver nuestro normas de prueba de motores electricos page.

Application-Specific Motor Recommendations

Warehouse AMR (50–200 kg)

Carretilla elevadora AGV (500–1,500 kg)

Heavy-Duty Platform AGV (> 1,500 kg)

AGC ligero / Cart (< 100 kg)

For light AGC applications using stepper motors, ver nuestro stepper motor product page. For motor comparison in the context of AGV vs AMR platform differences, ver nuestro Guía AGV vs AMR.

Preguntas frecuentes

What voltage motor is used in AGV?

The most common AGV motor voltages are 24V and 48V DC. 24V systems are used for compact AMRs and light AGVs (50–300 kg payload), while 48V systems are standard for medium to heavy AGVs (300–2,000+ kg). 12V is occasionally used for very light AGCs, and 72V for very heavy industrial AGVs. The voltage choice is driven by the battery platform and affects motor current draw, requisitos de cableado, and controller sizing.

How much torque does an AGV motor need?

AGV motor torque depends on total vehicle mass, radio de la rueda, rolling friction, target acceleration, and slope angle. Por un 150 kg AMR with 75mm wheel radius on smooth floor (μ=0.02) y 0.5 m/s² acceleration, the calculated wheel torque is approximately 7.8 N·m total (3.9 N·m per motor in dual drive). With a 1.5–2.0× safety factor, the design target is 5.9–7.8 N·m per motor. Heavy AGVs (>1 tonelada) may require 30–120 N·m per motor depending on configuration.

BLDC or servo motor for AGV — which is better?

BLDC motors are the preferred choice for most AGV and AMR applications in the 50–500 kg payload range due to their balance of efficiency, costo, and maintenance-free operation. Servo motors are better for heavy-load AGVs (>1 tonelada), applications requiring ±0.1 mm positioning accuracy, or scenarios with frequent high-dynamic maneuvers requiring 300% capacidad de sobrecarga. Para logística de almacén estándar, BLDC with planetary gearbox and encoder feedback provides sufficient performance at lower cost.

What gearbox ratio is used for AGV motors?

Common AGV gearbox ratios range from 10:1 a 50:1, con 15:1–25:1 being typical for warehouse AMRs. The ratio is calculated as motor RPM ÷ required wheel RPM. Por ejemplo, a motor running at 3,000 RPM with a wheel needing 150 RPM requires a 20:1 relación. Planetary gearboxes are the standard choice for AGV traction due to their high torque density, baja reacción (5–15 minutos de arco), y bajo ruido.

How long do AGV motors last?

A well-designed BLDC planetary gear motor with IP65 sealing and quality bearings typically lasts 10,000–20,000 hours before first maintenance. This equates to 4–8 years of single-shift operation or 2–4 years of 24/7 continuous operation. Brushed DC motors last 2,000–5,000 hours before requiring brush replacement. The most common failure modes for BLDC motors in AGV service are bearing contamination and winding corrosion — both addressable through proper sealing.

Can stepper motors be used for AGV?

Stepper motors can be used for light AGVs and AGCs (< 100 kg de carga útil) where positioning accuracy requirements are moderate (±1–5 mm) and speed is low. They offer cost advantages and simple integration. Sin embargo, steppers lose torque at higher speeds, are susceptible to step loss under sudden load changes, and are not suitable for heavy payloads or continuous operation. circuito cerrado (híbrido) steppers with encoder feedback address some of these limitations.

Referencias

1. Motor de giro. “How to Select the Right BLDC Gear Motor for AMR and AGV Robots.” Disponible en: https://www.twirlmotor.com/how-to-select-the-right-bldc-gear-motor-for-amr-and-agv-robots/
2. DMK Motor (BeUDMKE). “High-Performance AGV Motor for AMR/AGV.” Disponible en: https://www.dmkmotor.com/agv-motor/
3. X-TEAM Brushless DC Motor. “How to Choose a Suitable BLDC Motor for AGV?” Disponible en: https://www.x-teamrc.com/how-to-choose-a-suitable-bldc-motor-for-agv/
4. ROBOT HKT (AGVMotor.com). “AGV Motor for AGV/AMR Applications.” Disponible en: https://agvmotor.com/blogs/knowledge/agv-motor-for-agv-amr-applications
5. MyTen-Tech. “AGV’s Power Heart: Motor Selection Guide and Core Technology Analysis.” Disponible en: https://myten-tech.com/news/components-introduction-and-selection/agvs-power-heart-motor-selection-guide-and-core-technology-analysis/
6. motores orientales. “AGV — Automatic Guided Vehicle Sizing Tool.” Disponible en: https://www.orientalmotor.com/motor-sizing/agv-sizing.html
7. Sunrise Motor. “The Guide to BLDC Motors: From AGV Powerhouses to Medical Precision.” Disponible en: https://www.sunrisemotor-cn.com/The-Guide-to-BLDC-Motors:-From-AGV-Powerhouses-to-Medical-Precision.html
8. El motor Dunker. “AGV/AMV/AMR Gear Motors.” Disponible en: https://www.dunkermotoren.com/en/industries/warehouse-automation/agv-gear-motor
9. YIKONG (BiControls). “Torque Calculation and Optimization for AGV Drive Motors: Enabling Flexible Logistics in Automotive Manufacturing.” Disponible en: https://en.bicontrols.com/news_detail/50.html
10. Corporación Nidec Motor. “AGV Motors — Reliable and Robust AGV/AMR Motor Platforms.” Disponible en: https://moen.nidec.com/automation/Products/AGV-Solutions/AGV-Motors