HowStuffWorks «Inside an Electric Car»

15 мая 2014 | Author: | Комментарии к записи HowStuffWorks «Inside an Electric Car» отключены
GEM E6 Electric Cars

Inside an Electric Car

The heart of an car is the combination of:

The controller takes from the batteries and delivers it to the The accelerator pedal hooks to a of potentiometers (variable resistors), and potentiometers provide the signal tells the controller how much it is supposed to deliver. The controller can zero power (when the car is full power (when the floors the accelerator pedal), or any level in between.


The controller dominates the scene when you the hood, as you can see here:

The 300-volt, 50-kilowatt controller for electric car is the box marked U.S.

In this car, the controller in 300 volts DC from the battery It converts it into a maximum of 240 AC, three-phase, to send to the motor. It this using very transistors that rapidly the batteries’ voltage on and off to create a wave.

The potentiometers hook to the gas and send a signal to the controller.

The wires entering and leaving the

The controller’s job in a DC electric car is easy to Let’s assume that the pack contains 12 12-volt wired in series to create 144 The controller takes in 144 volts DC, and it to the motor in a controlled way.

The very simplest DC controller be a big on/off switch wired to the pedal. When you push the it would turn the switch on, and you take your foot off the it would turn it off. As the you would have to push and the accelerator to pulse the motor on and off to a given speed.

Obviously, sort of on/off approach work but it would be a pain to so the controller does the pulsing for The controller reads the setting of the pedal from the potentiometers and the power accordingly. Let’s say you have the accelerator pushed down. The controller reads setting from the potentiometer and switches the power to the motor on and off so it is on half the time and off half the

If you have the accelerator pedal 25 of the way down, the controller pulses the so it is on 25 percent of the time and off 75 percent of the

Most controllers pulse the more than 15,000 per second, in order to keep the outside the range of human The pulsed current causes the housing to vibrate at that so by pulsing at more than cycles per second, the controller and are silent to human ears.

An AC controller hooks to an AC motor. six sets of power transistors, the takes in 300 volts DC and produces 240 AC, 3-phase. See How the Power Grid for a discussion of 3-phase power.

The additionally provides a charging for the batteries, and a DC-to-DC converter to the 12-volt accessory battery.

In an AC the job is a little more complicated, but it is the idea. The controller creates pseudo-sine waves. It does by taking the DC voltage from the and pulsing it on and off. In an AC controller, is the additional need to reverse the of the voltage 60 times a second. you actually need six sets of in an AC controller, while you need one set in a DC controller.

In the AC controller, for each phase you one set of transistors to pulse the voltage and set to reverse the polarity. You replicate three times for the three — six total sets of

Most DC controllers used in cars come from the forklift industry. The Hughes AC seen in the photo above is the sort of AC controller used in the EV-1 electric vehicle. It can a maximum of 50,000 watts to the

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