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For a real electric assist bicycle, it is only allowed to operate in assist mode. This means it must be a "human power + electric power" hybrid output method, without a pure electric mode. The reason for only allowing the motor drive mode is that the assist drive mode effectively ensures the safety and reliability of riding, greatly increases the mileage per charge, and effectively avoids an increase in the overall weight of the bike. It also serves a dual purpose of commuting and fitness, allowing people to retain the riding experience while riding more easily and farther. Today, we will sort out the common types of electric assist bicycle motors on the market and their differences.
High-end mountain electric assist bicycles, in order to achieve better performance, usually adopt the mid mount motor solution. As the name implies, a mid mount motor is installed in the middle of the frame (at the crankset). Based on the installation method, the mid mount motor can be divided into integrated with the frame and external types. According to the motor structure and appearance, it can be further divided into coaxial mid mount motors and parallel-axis mid mount motors.
Mid mount motors have the advantage of maintaining the front and rear weight balance of the entire vehicle as much as possible and do not affect the shock absorber's action. The motor endures less road impact, and the high degree of integration can reduce unnecessary wire exposure. Therefore, in terms of off-road handling, stability, and passability, it is better than models with hub in motors. At the same time, riders can freely choose wheelsets and derailleurs, and daily disassembly and maintenance of hubs are simpler.
Of course, this doesn't mean that mid mount motors are necessarily better than hub in motors. Any brand's products vary in grade, and comparisons should also consider multiple dimensions such as comprehensive performance, price, and use case. Hence, when choosing, it's essential to consider them rationally. In fact, mid mount motors are not without flaws. Since the driving force needs to be transmitted to the rear wheel through the chainring and chain, compared with hub in motors, it will accelerate the wear of the chainring and chain, and you need to pedal a bit more gently when shifting gears to avoid the snapping sound from the chain and flywheel.
Hub in motor, as the name implies, integrates the motor inside the hub. When powered, the motor converts electrical energy into mechanical energy, thus driving the wheel to rotate and propelling the vehicle forward.
Designers usually install the hub in motor in the rear wheel, especially for sports models, as the rear triangle structure is more stable and reliable in strength compared to the front fork. The torque and cadence signals are also easier to transmit and wire (assuming you want to buy an electric assist bicycle and not an electric moped). There are also some delicate small-wheel city bikes on the market that adopt the front wheel hub solution to balance the internal gear hub and the overall look of the vehicle, which is also ok. Some brands, in pursuit of more robust power, install motors on both the front and rear wheels, with a rated power of even up to 1000W. This type of product would already be classified as an electric motorcycle.
Hub in motors, with their mature design and relatively low cost, occupy a significant share of the electric assist bicycle market. However, since the motor is integrated into the wheel, it disturbs the front and rear weight balance of the entire vehicle, and it is more affected by bumpy impacts during mountain off-roading. For full suspension models, the rear hub in motor also increases the unsprung mass, and the rear suspension has to deal with greater inertia impact. Therefore, major brands usually opt for mid mount motors for their sports models.
sales@syimotor.com
+86-512-65975022
+86-512-65963935
No.588, Liupu Road, Wuzhong District, Suzhou/215124, JiangSu Province, China
