How does an electric car depend on the accelerator to control speed? What is the principle?
Governor brushless motor is a little more complex, it is the first throttle and brush motor hardly what two things, change is the MCU program, is not a single motor loop to adjust duty cycle, also occurs in three-phase asynchronous pulse timing signal to the motor is composed of 6 groups of field effect tube driving circuit. At the same time, the brushless motor also needs to be equipped with a Holzer sensor speed sensor, which makes the following sequence of three-phase current follow the motor speed gradually.
Now the field effect tube before the current carrying a small volume greater than the old 3DD15 transistor N times, high power FET conduction resistance is very small, the pressure drop is small, it is waste heat is very small, the governor also follow the small fins, the controller will do small volume controller used; a warm hand without desperately hot, it is representative of the overall system efficiency is high,Resistor? What's the resistance on the circuit of the motor? Braved the raging fire even opium, "furnace" white power consumption for heat resistance as the motor speed does not exist.
Don't answer if you don't understand;Two kinds of electric vehicle brushless motor; and a brush, brush motor governor slightly simple, generally use the N field effect tube single loop electronic switch composed of high current, by turning on hundreds of Hertz and disconnected time ratio (i.e. duty ratio) control can realize electric machine, speed governor the power device is a N field effect tube, the core part of SCM, receiving the temperature of the motor, the motor speed, the speed regulator is hand in sliding potentiometer (now do not have the contact speed adjustment device -- commonly known as "your throttle"! Slowly to no adverse eddy current, electromagnetic mutual inductance, Holzer sensor development.
