What is the hub motor?
Hub motors place electric motors inside the car’s wheel hub to achieve driving force transmission. It uses a method of the electric motor being directly connected to the wheel axle of the vehicle without a traditional transmission device.
What is the structure of the hub motor?
The main parts are as follows:
Motor: The motor is the core component of the hub motor and is responsible for generating driving force.
Controller: The controller is responsible for controlling the speed and torque of the motor.
Reducer: The reducer is used to reduce the speed of the motor and increase the torque.
Sensor: The sensor is used to detect the operating status of the motor, such as rotation speed, temperature, and so on.
What is the feature of the hub motor?
The hub motor is also called wheel-mounted motor technology. It is a motor designed to integrate the car’s “power system, transmission system, and braking system”.
What are the advantages of the hub motor?
1. It can omit a great number of transmission components, making the vehicle structure simpler and lighter in weight;
2. The hub motor can be installed in any wheel hub of the car, so it can achieve a variety of drive forms, such as front-wheel drive, rear-wheel drive, and so on, which greatly improves the performance and controllability of electric vehicles.
3. To facilitate braking energy recovery, the wheel hub motor can directly convert braking energy into electrical energy and store it in the battery, which can improve the cruising range of electric vehicles;
4. It facilitates the adoption of a variety of new energy vehicle technologies.
What are the disadvantages of the hub motor?
1. Increase the mass under the spring and the rotational inertia of the hub, which will affect the vehicle’s control, comfort, and suspension reliability;
2. Electric braking performance is limited, and a lot of electrical energy is consumed to maintain the operation of the braking system;
3. High conversion efficiency, lightweight four-wheel hub motors are expensive;
4. Putting a precision motor on the wheel hub will lead to failure problems caused by long-term severe up and down vibration and harsh working environment, unstable reliability, and high maintenance costs;
5. The motor itself generates heat, and due to the increased unsprung mass, the braking pressure is greater, requiring high braking performance;
6. The hub motor is located inside the wheel, so the space for heat dissipation is limited and it is difficult to dissipate heat, which will affect the performance and service life of the motor.
What are the classification methods of the hub motors?
There are four main classification methods, the details are as follows:
（1）Classification by motor type: permanent magnet motor (PM), induction motor (IM), switched reluctance motor (SRM), and transverse flux motor (TFM);
（2）Classification by structural form: inner rotor hub motor and rotor type hub motor;
（3）Classification by driving mode: direct drive and reduction drive;
（4）Classification by drive type: single-wheel drive and multi-wheel drive.
What is the working principle of the hub motor?
First of all, when current passes through the hub motor, the motor generates a rotating magnetic field;
Secondly, the rotating magnetic field interacts with the stator and rotor inside the motor to generate torque;
Thirdly, the torque of the wheel hub motor is directly transmitted to the wheels, thereby pushing the vehicles forward.
Some HONEST’s advantages of the hub motor:
A. Rich experience;
B. Many professional R&D personnel;
C. Sophisticated equipment;
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The details of HONEST’s hub motor winding machine are as follows:
The hairpin hub motor block stator winding machine through wire-folding module and stator core servo differential compensation winding, automatic winding, wire trimming, optional paint removing function, automatic wire pair interface is reserved for the stand-alone machine and can be grafted to hairpin in-wheel motor stator assembly automatic line.
The equipment process includes block stator core assembly into fixture → block stator winding → finished product unloading.
Equipment Parameters:
A. Production efficiency: ＜60s;
B. Change time: 30min;
C. Yield rate: ≥99.5%;
D. Utilization rate: ≥95%
E. Voltage: AC380V/AC220V 50HZ
F. Control mode: man-machine interface, programmable logic controller PLC, communication module.
Equipment advantages:
A. Configure high-precision sensors;
B. The equipment prompts various misoperations and bad states in real-time;
C. Every part of the manual assembly is equipped with a leak inspection and error-proofing machine;
D. The equipment is ergonomically designed and easy to operate;
E. Use technological means to reduce or avoid the phenomenon of wrong installation, missing installation, reverse installation, and so on;
F. Compared with the conventional winding method, the angle of the arc fits better, and the copper wire at the angle and the arc of the skeleton can fit perfectly without bulging.
HONEST Automation provides hub motor winding and assembly customized equipment solutions. Contact us now to get specifications and quotes.
