Understanding The Concept Of An Electric Hub Motor


electric hub motor

Electric wheel motors are a unique innovation; they combine high-speed (high rpm) AC drive with an energy-efficient, compact battery. This design allows for a large number of installations. You’ll find them mainly in small to medium-sized urban bikes, commuter bikes, and small-toy bikes. They’re also found on recumbent bicycles and on racing bikes. In fact, many recumbent bikes actually have an electrical hub on the bottom, to help support the lower center of gravity.

Use Two Or More Parallel Rotation Sets

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Hub motor designs tend to use two or more parallel rotation sets of aluminum wheels with a central spindle. The axle is mounted on the inside of the wheel hub. They can be made of almost any material, but usually have some sort of sealed bearing. This reduces friction, increases lifespan, and makes maintenance easier. AC drives tend to use sealed bearings on both sides; this also adds to longevity and reliability.

Most modern electric drive systems come with a dual suspension system. The front suspension uses a spring arrangement to provide smooth rides. The rear is often made with a self-adjusting system, with a shock absorber bar. Both types of suspension, however, are sensitive to irregularities in the terrain and can become damaged without adequate maintenance.

Provide More Power With Less Effort

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The advantages of in-wheel electric motors over electric drivetrains are clear. They provide more power with much less effort and can reach higher speeds than comparable motors. The only real disadvantage is that they are much heavier than their electricity-powered cousins. The most common size of electric wheel motor is the seven tooth; anything longer will require a large main gear.

Other benefits include quietness and ease of maintenance. In an electric drivetrain, the motor does most of the work while the drivetrain chassis absorbs the energy of the crankshaft and the rotation speed of the spindle. This enables the motor to function more effectively under heavier loads and longer distance. Because of the suspension motor’s role, it is important to retain good ball bearing design. Hydraulic rebound and dampening systems can reduce the effect of any unwanted vibrations, which can lead to costly breakages.

Weight Of The In

On the downside, the weight of the in-wheel drivetrain often limits the usefulness of such vehicles for many consumers. As previously mentioned, the benefits of a smaller, lighter motor are obvious when talking about greater acceleration and maneuverability. However, the biggest drawback of these vehicles is their inability to make turns at low speeds and during slow driving conditions. The main problem occurs when the braking force is applied to the wheel that already has deformed from heat build-up or from uneven handling. These issues can be solved by fitting a wheel chock to the vehicle that forces the vehicle tires to brake laterally to provide lateral support, thus counteracting the hydrostatic pressure that develops on the brakes.

Final Thoughts

In general, an electric drivetrain simplifies the process of driving, particularly when it comes to heavy loads. The lack of a drivetrain requiring a crankshaft results in a smaller overall size, as well as a lighter overall vehicle weight. With a smaller overall size, the vehicle’s center of gravity is moved forward, improving the effectiveness of the shock absorbers. Finally, there is no need to use a drivetrain with a heavy transmission tunnel or clutch to allow the driver to accelerate and decelerate the vehicle. Because of these benefits, many manufacturers have offered concept vehicles with electric wheels for sale, especially those that can fit into limited space.

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