The choice of the type of motor vehicle in the elderly should take into account the economic factors such as the technical requirements of the old scooter, the performance of the motor, the weight, the volume and other technical factors and the cost. For older scooters, the efficiency of driving the motor is particularly important because all the power of the scooter is driven by the motor to the wheel. Determine the motor characteristics of the parameters based on the vehicle to meet the maximum load when driving the continuous power requirements, but also to meet the vehicle to the maximum peak torque to accelerate or climbing requirements, continuous power refers to the motor stable operation of the output power The
The basic requirements for driving motor performance are: large enough starting torque to meet the old truck scooter quick start, acceleration, climbing, frequent Kai, stop the requirements; motor speed range is small, generally 25% to 100% The maximum speed range, the approximate small torque, constant power output characteristics, to meet the requirements of the oldest scooter maximum speed driving conditions; greater than the power (specific power is defined as the maximum power per unit mass), the maximum power The (1 ~ 1.25) kW / kg or more; fast torque response characteristics, in a variety of speed range can quickly and softly control the drive and braking torque, requiring high controllable motor, steady-state accuracy and dynamic Good performance; with good environmental adaptability, in different working conditions can work reliably; maintenance is simple, low noise. Brushless DC motor is characterized by permanent magnet and excitation winding, permanent magnet is usually embedded in the rotor, the excitation winding fixed on the stator, by adjusting the excitation current control air gap flux, it can be convenient in the high-speed area Weak magnetic adjustment, improve the motor drive characteristics. At the same time, the brushless DC motor uses the discrete rotor position feedback signal to control the commutation and uses the AC square wave to supply the power, because the square wave magnetic field and the square wave current interaction produces the torque larger than the sine wave. Therefore, the permanent magnet brushless motor has the advantages of high torque, high power density, simple position detection and control method, and high efficiency.
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