Electric vehicles have become the strategic focus of the automotive industry in various countries around the world(8352 brushless motor). High-quality wheel motors and their control systems are important research directions and hotspots in the field of electrical engineering at home and abroad(single drive esc for belt motor). Because of their obvious advantages, they have become electric vehicles.
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With the advent of more compact planetary gear reducers(8352 motor), inner rotor hub motors are more competitive in terms of power density than low speed outer rotor types. The duration is 120 ° electrical angle, and the flat top part of the trapezoidal wave back-EMF is also 120 ° electrical angle(dual drive esc for hub motor). The two are strictly synchronized, and the motor will generate a constant electromagnetic torque at this time.
There are sensors and no sensors, and some electric bicycles must be stepped on to run because there are no sensors inside(dual hub motor esc). It directly measures the back-EMF of the motor to know the position of the rotor and perform commutation(dual drive esc for belt motor). Geared and non-geared, motors with reduced starting current in order to prevent demagnetization of magnetic steel must use reduction gears to improve starting efficiency.
After the magnetic steel material is improved, it is not necessary to use gears(single drive esc for hub motor). Permanent magnet brushless DC motors should meet the following requirements in ideal conditions: the three-phase windings are completely symmetrical, the air gap magnetic field is a square wave, the stator current is a square wave, and the back electromotive force is a trapezoidal wave(mini skateboard remote control). Energy and environmental issues are prominent.
Wheel drive motors for other electric vehicles(electric skateboard esc). As early as 1900, Porsche first produced electric vehicles equipped with in-wheel motors for front wheels. In the 1970s, in-wheel motor technology was also called wheel-mounted motor technology. Its biggest feature was the power(electric longboard remote control), Transmission and braking devices are integrated into the hub, so the mechanical part of the electric vehicle is greatly simplified.
Before starting the brushless motor, a sensor must be used to know the relative position of the rotor and stator(6384 190kv). At present, there are also domestic brand car manufacturers starting to develop this technology. In-wheel motor technology is not new(electric skateboard wireless remote control). Sensors are required to know the relative position of the rotor and stator before starting. An important direction of development.
The non-inductive motor directly measures the back-EMF of the motor to know the position of the rotor, and the controller drives the power tube for commutation(6354 brushless motor). High-speed and low-speed magnetic manual gear clutch high-speed brushless hub motors are lightweight, low-speed brushless hub motors are simple in construction, low in noise and high in power(e skateboard motor). But the in-wheel motor solves this problem very well.
It also means saving more space(5065 270kv). For in-wheel motors used in passenger cars, Japanese manufacturers have developed this technology earlier and are currently in a leading position. International automotive giants including GM and Toyota are also involved in this technology(sliding gloves for skateboarding). The Ruiqi X1 extended range electric vehicle exhibited at the 2011 Shanghai Auto Show uses wheel motor technology.