It also eliminates the space required for mounting the motor. This motor makes the overall vehicle less bulky as it does not require any gear system.
In a few cases, the motor itself has inbuilt planetary gears. This type of motors does not require external gear system. It is also called as Hub motors because the wheel is directly connected to the exterior rotor. In this type, the rotor of the motor is present outside and the stator is present inside. You can learn more about BLDC motors by comparing it with normal brushed motor. The BLDC motors are the most preferred motors for the electric vehicle application due to its traction characteristics. BLDC motors are suitable for high power density design approach. BLDC motors have traction characteristics like high starting torque, high efficiency around 95-98%, etc. The commutation is done electronically in this motor because of this BLDC motors are maintenance free. It is called brushless because it does not have the commutator and brush arrangement. It is similar to DC motors with Permanent Magnets. This motor comes under the category of DC brushed motors. These motors are used in Indian railways.
The main drawback of DC series motor is high maintenance due to brushes and commutators. All these characteristics make it an ideal traction motor. The advantages of this motor are easy speed control and it can also withstand a sudden increase in load. It was the most widely used motor for traction application in the early 1900s. High starting torque capability of the DC Series motor makes it a suitable option for traction application.