1 - 7 of 7 Posts

Nothing will change up to the speed at which more than 200 volts is required to produce full power; past that, power will be restricted. It won't be able to produce power at all at the usual maximum speed.What happen if I run a Tesla drive train at 200v? What will change? Max speed? Power output? What will happen in term of performance? What will decrease?

Nothing will change up to the speed at which more than 200 volts is required to produce full power; past that, power will be restricted. It won't be able to produce power at all at the usual maximum speed.What happen if I run a Tesla drive train at 200v? What will change? Max speed? Power output? What will happen in term of performance? What will decrease?

So basically it will have like a rpm limit? Roughly half of the speed it will give at 400v? I guess also want give the same kw? Meaning power output?

What to expect other than reduce top speed? What about torque and horsepower?

Thank you very much for the reply!!!

You will probably be able to have about half the power as you would at 400v.

You will be able to have full torque up to about 30-33mph (half of the 62mph).

After that the torque will fall.

You will be able to rev it to its top speed but not with the same torque as with 400v.

Best Regards

/Per

Most of the voltage goes to overcoming back EMF, which is proportional to both current and motor speed. So half the voltage can maintain the same current (and so the same torque) to about half the speed.So basically it will have like a rpm limit? Roughly half of the speed it will give at 400v? I guess also want give the same kw? Meaning power output?

What to expect other than reduce top speed? What about torque and horsepower?

The motor can still run faster than that, but with more limited current, and so more limited torque, and so less power (power = torque X speed).

You don't get to independently choose voltage and current. The controller applies voltage, current flows as a result, and the product of the two is power. How much voltage is required to push a specific current is dependent on motor speed, so for a given motor speed and power there is only one combination of current and voltage required.

Since performance charts are normally published only for maximum power output, many people don't seem to realize that a motor is driven with all of the available voltage very little of the time. Even when accelerating as hard as possible, voltage is limited to keep current within its limit at low speeds.

This is a good point. I was only considering the effect of available voltage to motor performance, but the controller/inverter does need to cooperate.

1 - 7 of 7 Posts

- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

DIY Electric Car Forums

A forum community dedicated to DIY electric car owners and enthusiasts. Come join the discussion about electric vehicle conversions, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!

Full Forum Listing
Recommended Communities

Join now to ask and comment!