We have known about the types of hub motors, such as outer rotor type, induction motor, switched reluctance motor, etc. among them, the outer rotor hub motor technology has a great development prospect. Today, the small series of global wind turbine will take you to understand the characteristics and application of outer rotor hub motor.
1、 Characteristics of outer rotor hub motor
1. Low speed and high torque
The speed of the outer rotor type wheel motor can reach 1500-2000 RPM up to the maximum, and the rated speed is 1000-1400 rpm, which can reach 4-5 times of overload capacity to meet the requirements of acceleration and climbing at low speed. When the vehicle enters the regenerative braking state, the braking effect is good
2. Free distribution of driving force
Because the wheel hub motor has the characteristics of independent driving of a single wheel, it can be easily realized whether it is front drive or rear drive, or four-wheel drive. It is very easy to realize full-time four-wheel drive on the vehicle driven by wheel motor. Each wheel is controlled independently, and the distribution of driving force will be very free. Therefore, we will have a great technical improvement in the research and development of anti slip device and traction control system.
3. Increase steering angle
Through the drive shaft to transmit the driving force of the car, the steering angle of the steering wheel is limited, about 40 degrees. The outer rotor hub motor is directly connected with the wheel, and the wheel can be turned to the fully transverse state, which expands the steering angle. The combination of four-wheel drive and four-wheel steering device can realize the lateral movement and super rotation of the vehicle.
4. More precise control
In the case of direct drive, the outer rotor hub motor will not be affected by the backlash of the transmission mechanism, so it is easier to control and more comfortable. And even if the reducer is used, it will not be limited by the resonance cycle number of the drive shaft, so the control force is more accurate than the motor body mounted type.
5. Reduce the moment of inertia
Choosing a suitable outer rotor hub motor can reduce the inertia moment and improve the available energy efficiency during acceleration. When an automobile accelerates, it needs two kinds of energy, one is to accelerate the body of the car, and the other is to accelerate the rotor and transmission mechanism of the motor. Therefore, the smaller the inertia moment is, the less energy is needed for acceleration.
2、 Application of outer rotor hub motor
1. Two wheeled motorcycle
The electric system of the motorcycle includes a motorcycle body, a front wheel and a rear wheel mounted on the motorcycle body, and an outer rotor hub motor driving the motorcycle to rotate is connected. The outer rotor is of 8-pole or 10 pole structure, which has sufficient winding space. If possible, increasing the number of winding turns can obtain high torque per unit current under the same speed and torque.
2. Electric vehicle
When it is applied to electric vehicle drive, it can be installed in the wheel hub and wheel edge, and integrated with mechanical braking system and suspension. The electric vehicle driven by outer rotor hub motor still needs mechanical braking system. The brake can be drum or disc brake as required. Because of the feedback braking ability of the motor, the design capacity of the mechanical brake can be reduced appropriately and the energy loss can be reduced. Heat dissipation, structure, weight and other factors should be considered in the integrated optimization design of hub motor and mechanical braking and suspension system.
The above content is the specific introduction of the characteristics and application of the outer rotor hub motor, hoping to help you. The wheel hub motor drive system is a new drive type, but because of its obvious advantages, it has become an important direction of the development of electric vehicles.
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