Widened Magnet High-Torque Motor

The Widened Magnet High-Torque Motor manufactured by Qianjiang Electric delivers powerful acceleration, heavy-load capacity, and steep-slope climbing performance, all while maintaining impressive top speeds.

Featuring Class H high-temperature-resistant enameled wire and an IP67 fully sealed waterproof design, it is ideally suited for mountainous terrain, high-intensity food delivery, carrying a passenger, or cargo-hauling electric motorcycle conversions.

Core Advantages

1. Widened and Lengthened Magnet Design

The rotor uses widened, high-temperature-resistant neodymium-iron-boron magnets to increase the effective magnetic field area. Compared with motors using conventional standard magnets, torque is increased by 30%–50%.

The motor provides strong power at low speeds, allowing smooth starts under full load without sluggishness or rollback on slopes. It easily handles passenger carrying, cargo transportation, and muddy dirt roads.

2. High-Temperature-Resistant Magnets

High-temperature-resistant sintered neodymium-iron-boron magnets are used. The widened magnets provide a larger heat-dissipation contact area, resulting in lower rotor temperature rise.

During frequent acceleration and prolonged heavy-load uphill operation, the magnets are less likely to demagnetize due to high temperatures, allowing the motor to maintain consistent power.

3. Customized Thickened High-Density Windings

The stator uses thickened H-class 180°C high-temperature-resistant enameled wire with fully automatic precision winding, resulting in lower coil resistance. Power loss is reduced during high-current output, and winding temperature rises more slowly during high-torque operation, helping prevent coil burnout under heavy loads.

4. Balanced High- and Low-Speed Performance

The widened magnets optimize the magnetic field curve and solve the common problem of high-torque motors being powerful at low speed but slow at high speed.

Strong low-speed torque provides excellent climbing and heavy-load performance, while the magnetic field losses in the high-speed range are optimized, allowing the motor to achieve a respectable top speed. Suitable for both performance riding and daily commuting.

5. Waterproof and Dustproof for Harsh Conditions

The Widened Magnet High-Torque Motor uses double-layer thickened rubber sealing gaskets, waterproof cable-entry connectors, and a die-cast sealed rear cover. It can withstand riding in the rain, passing through puddles, and exposure to mud and water splashes on mountain roads, helping prevent water and mud from entering the rotor and magnets and reducing the risk of magnet rust and Hall sensor damage.

6. Efficient Heat Dissipation

Widened magnets generate more heat during operation, so the motor housing uses a thickened die-cast aluminum shell with heat-dissipation grooves. This accelerates overall heat dissipation from the stator and rotor.

During prolonged heavy-load delivery operations, the housing temperature remains more controllable, helping slow magnet aging.

7. High-Precision Dynamic Balancing

The widened magnets are individually selected, and the complete rotor undergoes dynamic balancing calibration. Even during full-load starts and low-speed heavy-load operation, the motor avoids excessive vibration, shaking, and low-frequency humming, providing a smoother and more comfortable riding experience.

8. Strong Compatibility

Standard Hall wiring and a universal disc brake mounting base are used. The motor supports sine-wave controllers, regenerative braking, and reverse functions. Multiple hub sizes from 10 to 17 inches are available, making it suitable for converting electric scooters, off-road electric motorcycles, cargo rear wheels, and heavy-duty electric tricycles.

Technical Analysis

1. Widened Magnet Principle

Motor torque fundamentally comes from the interaction between the rotor magnets and the magnetic field generated by the stator windings. Widening the magnets effectively increases the width of the magnetic force area, generating greater electromagnetic thrust under the same current.

In conventional motors, magnet width is limited, so achieving higher torque often requires significantly increasing the current, resulting in excessive heat generation. Widened magnets can produce higher torque at lower current, resulting in lower heat generation.

2. Winding Optimization

The number of winding turns is customized according to the magnetic field characteristics of the widened magnets. The low-speed high-torque version uses thicker wires with fewer turns, while the balanced high-speed version uses optimized winding specifications to achieve a balance between torque and top speed.

3. Enhanced Rotor Protection

The widened magnets are equipped with high-strength magnet fixing brackets and reinforced with adhesive. This prevents the magnets from becoming loose, shifting, or falling off under vibration and impact, making the motor suitable for off-road and uneven road conditions.

Specifications

Applications

1. Mountain and Rural Transportation: Widened-magnet high-torque performance makes it easy to climb continuous steep slopes and winding mountain roads.

2. Food Delivery and Courier Vehicles: Suitable for frequent starts and stops throughout the day and carrying heavy storage boxes, with stable power under repeated acceleration and braking.

3. Two-Person Transportation and Heavy-Load Cargo: Provides smooth and powerful starts when carrying passengers, children, or heavy items in the rear cargo area.

4. Off-Road Electric Motorcycle Conversions: Strong high-torque recovery capability for muddy roads, potholes, and uneven dirt roads.

5. Heavy-Duty Electric Tricycles and Cargo Rear-Wheel Powertrain Upgrades: Suitable for upgrading the power system of heavy-load electric tricycles and cargo vehicles.

Quality Assurance

1. Every motor undergoes aging load testing, torque testing, waterproof spray testing, and vibration testing before leaving the factory. All widened magnets are magnetically screened to ensure consistent magnetic strength.

2. Warranty coverage is provided for damage not caused by human impact, deep-water immersion, or wiring overload burnout.

3. Customization is available for magnet thickness, magnet width, cable outlet direction, axle length, mounting hole positions, and housing color. Factory bulk orders are supported.

FAQ

Q: What is the difference between a widened-magnet motor and an ordinary motor?

A: Under the same power rating and with the same controller, the widened-magnet motor provides significantly higher low-speed torque, giving it stronger performance during starting, climbing, and heavy-load operation. It also generates less heat under heavy loads and is less prone to power reduction.

Q: Will widened magnets reduce the top speed?

A: Our windings are specially matched to the widened magnetic field. For applications that prioritize climbing performance, low-speed winding can be selected. For applications that require both torque and top speed, a balanced winding version is available. Customers can provide their road and usage requirements to customer service for the appropriate configuration.

Q: What power rating should I choose for frequent mountain-road riding?

A: For daily commuting and climbing, a 3000–5000W widened-magnet version is recommended. For frequent heavy-load use and continuous long steep climbs, a 6000W or higher specification is recommended.

Q: Are the magnets likely to come loose after long-term use?

A: The rotor magnets use high-temperature-resistant structural adhesive combined with external clips for dual fixation. Each motor undergoes vibration testing before leaving the factory. Under normal use on uneven roads, the magnets will not come loose.