The vast majority of Electric Bike Kit have hub motors. It can be installed in your original bike and will not incur additional costs. The wheel motor described below will make you much like having one.
The advantages of the wheel motor on an electric bicycle: the motor is easily placed in the hub, making the basic design of the bike unchanged. Because of this positioning, the conversion kit can be used to convert the wheel motor to almost any bicycle. If you already have a suitable bike, this may reduce the cost. The hub motor is relatively simple to the motor and is completely independent. This means that you can use a motor on almost any bike, and if you want to upgrade your bike, you can install it on your bike which helps keep the cost of this bike down. Because the motors are sealed, their maintenance is extremely low. They are usually not affected by wind, rain, snow and sleet.
The hub motor is directly connected to the wheels that are being powered, and for high efficiency, the motor can move the wheels very efficiently, just like a wheel. The center of gravity of the bike with the hub motor installed is quite low, which is conducive to balance and maintain a classic sense of cycling. If the motor is damaged, it is usually only necessary to replace the motor without affecting the rest of the bicycle. If necessary, you can easily update to newer motors.
As the hub motor is more complex than other motors, the cost is relatively high. The seal of the motor means that there may be overheating problems, because there is no simple way to make the heat escape. The hub motor is to be installed in the rim, which makes the reed quality of the vehicle less favorable for handling.