Direct-Drive Hub Motor

The Direct-Drive Hub Motor uses an integrated outer-rotor design and eliminates the need for a gear-reduction mechanism, allowing power to be transmitted directly to the wheel.

The motor features quiet operation, high transmission efficiency, a reliable structure, and support for regenerative breaking. Its well-designed sealing and protection system makes it suitable for urban two-wheel mobility vehicles.

It is ideal for continuous cruising on flat roads, providing a good balance between driving range and riding comfort. This makes it a mainstream drive solution for lightweight electric mobility vehicles.

Product Structure

1. Stator: Fixed axle, laminated silicon-steel core, three-phase enameled copper windings, and Hall position sensors with five Hall signal wires.

2. Rotor: Hub shell, permanent magnets, and sealed bearings at both ends.

3. Sealing System: End covers and sealing rings. Standard products provide IP54 protection, while customized high-end models can achieve IP67 dust and water resistance.

4. Wiring: Three heavy-gauge phase wires (U/V/W) and Hall sensor signal wires.

Working Principle

Battery power → Controller regulation → Stator generates a rotating magnetic field → Rotor rotates → Wheel receives driving force

The controller supplies three-phase alternating current to the stator windings, generating a rotating magnetic field. This magnetic field drives the permanent magnets on the rotor, causing the motor’s outer shell to rotate and directly drive the tire.

When the vehicle is coasting, the wheel drives the motor in reverse, allowing regenerative braking and energy recovery. This is a standard advantage of direct-drive motors, whereas geared motors with one-way clutches generally cannot recover braking energy.

Product Specifications

Product Applications

1. Two-wheel electric vehicles: Electric bicycles, urban electric motorcycles, and direct-drive motors for spoke wheels, especially for flat-road commuting and low-to-medium-speed cruising.

2. Low-speed mobility vehicles: Sightseeing vehicles and electric tricycles operating with light loads on paved roads.

3. Personal and lightweight mobility equipment: Self-balancing vehicles, electric scooters, and other light-duty vehicles.

Why Choose Qianjiang Motor?

1. Over 10 Years of Professional Experience

Starting with hub motor technology, Qianjiang Motor has accumulated over 10 years of experience in research, development, and mass production. We have developed more than 80 motor models.

2. Strong Research and Development Capabilities

We serve not only the commercial and consumer markets but also provide long-term system-level solutions integrating motors, controllers, and batteries for leading research institutions.

Our partner institutions include Tsinghua University, Harbin Institute of Technology, Nanjing University of Aeronautics and Astronautics, Chongqing University, Southeast University, Jilin University, and others.

3. Customization and Engineering Services

Qianjiang Motor has a complete R&D team covering motor structure optimization, high-torque design, efficient heat dissipation, controller matching, and software and hardware development.

We support the complete development process:

Concept design → 3D prototype → Small-batch trial production → Large-scale production under ISO 9001 standards

4. International Certifications and Quality-Control System

Our factory fully implements the ISO 9001 quality-management system.

Our products are CE certified, supported by dozens of independently owned intellectual-property rights, and designed to meet the strict market-access standards of Europe, North America, and Southeast Asia.

Frequently Asked Questions

Q1: Which parameters can you customize?

A: Qianjiang Motor has a comprehensive R&D and manufacturing system and supports in-depth customization in the following areas:

● Electrical parameters: Operating voltage, including 24V, 36V, 48V, 60V, and 72V; rated power; rated speed; and rated torque.

● Mechanical structure: Wheel diameter from 4 to 22 inches, axle length, dropout width, mounting-hole positions, and tire compatibility, including solid and pneumatic tires.

● System integration: Matching sine-wave controllers, throttle controls, and battery systems can also be supplied.

Q2: What is the difference between a direct-drive hub motor and a geared hub motor?

Q3: Does a direct-drive hub motor require extensive maintenance?

A: Compared with conventional transmission systems, direct-drive hub motors require relatively little maintenance.
Recommended routine maintenance includes:

1. Regularly inspect the motor cables and electrical connections.
2. Avoid prolonged use of high-pressure water around the motor connectors.
3. Keep the hub surface clean.
4. Check for any unusual noise or vibration.