How much do you know about electric motorcycles?
Electric motorcycle is a kind of electric vehicle, which uses battery to drive motor. The electric drive and control system is composed of drive motor, power supply and motor speed control device. Other devices of electric motorcycle are basically the same as those of internal combustion engine.
Electric motorcycle power supply
The power supply provides electric energy for the driving motor of the electric motorcycle. The motor converts the electric energy of the power supply into mechanical energy and directly drives the wheel and working device through the transmission device or. Nowadays, the most widely used power supply on electric motorcycles is lead-acid battery. However, with the development of electric vehicle technology, lead-acid battery is gradually replaced by other batteries because of its low specific energy, slow charging speed and short service life. The application of new power supply is developing, which opens up a broad prospect for the development of electric motorcycle.
Electric motorcycle motor
The function of the motor is to convert the electric energy of the power supply into mechanical energy and directly drive the wheel and working device through the transmission device or. Nowadays, DC series motor is widely used in electric motorcycles. The mechanical characteristics of this motor are very consistent with the driving characteristics of vehicles. However, due to the commutation spark, small specific power, low efficiency and heavy maintenance workload, DC motor is bound to be gradually replaced by DC brushless motor, switched reluctance motor and AC asynchronous motor with the development of motor technology and motor control technology.
Electric motorcycle control device
The motor speed control device is set for the speed change and direction change of electric motorcycle. Its function is to control the voltage or current of the motor and complete the control of the driving torque and rotation direction of the motor.
In previous electric motorcycles, the speed regulation of DC motor was realized by series resistance or changing the number of turns of motor magnetic field coil. Because its speed regulation is step-by-step, and will produce additional energy consumption or use the complex structure of motor, it has been rarely used today. Nowadays, thyristor chopper speed regulation is widely used in electric vehicles. Stepless speed regulation of the motor is realized by evenly changing the terminal voltage of the motor and controlling the current of the motor. With the continuous development of electronic power technology, it is gradually replaced by other power transistor chopper speed regulation devices. From the development of technology, with the application of new drive motor, the speed control of electric motorcycle will be transformed into the application of DC inverter technology, which will become an inevitable trend.
In the rotation direction conversion control of the driving motor, the DC motor changes the current direction of the armature or magnetic field by relying on the contactor to realize the rotation direction conversion of the motor, which makes the circuit complex and reduces the reliability. When AC asynchronous motor is used to drive, the change of motor direction only needs to change the phase sequence of three-phase current of magnetic field, which can simplify the control circuit. In addition, the use of AC motor and its frequency conversion speed control technology makes the braking energy recovery control of electric motorcycle more convenient and the control circuit more simple.
Tag:Electric motorcycle power supply,Electric motorcycle motor,Electric motorcycle control device