Dynamometers

Do your own research.

So, you do not understand the meaning of 4-quadrant operation, it seems.

Here is the difference in dynamic and regenerative braking:

Obviously.

Like you, for example.

finally! we have a winner!

Jamie

Ur dense... it's obvious..

Jamie

I don't need to, I already know how it works.

Jamie

That's your normal response when you have egg on your face.

Jamie

True regenerative braking puts power back into the supply. Dynamic braking uses electromagnetic force to brake, but does not return the power to the source. DC dynamic braking can also be regenerative. AC dynamic braking is seldom regenerative. This particular unit is not. It is described as an AC 4 quadrant controller for a DC motor - and that is what it is..

In a DC system, 4 quadrant is often, (ok, usually) but not always, regenerative. Not usually on an AC supply system.

4 quadrant symple means it can controll both accelleration and decelleration in both directions - hense - 4 quadrant. Dynamic braking in a 4 quadrant AC control generally sinks (dissipates) the decelleration power, while regenerative braking in a 4 quadrant DC system generally returns the braking energy to the source.

Just my experience. 2 quadrant control can also be either regenerative or dynamic.

Please show me a circuit for 4 quadrant control of a DC motor from an AC supply that implements true regenerative braking. Explain how the output of the DC motor is syncronized to the ac line frequency. Then give me the name and manufacturer of the contoller, with specs on the amount of current it is capable of returning to the grid, and I'll believe you.

I am fully aware of DC regenerative 2 and 4 quadrant motor controls, and I know how an induction motor can be used as a generator, but I'd really like to know how to recover the power from my DC motor to the AC grid. (not just recover it into a battery)

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if you can recover it to a battery you can recover it to the grid, just like most solar systems

-Lasse

The krw response. What they know frequently happens not to be so - to quote Will Rogers.

--
Bill Sloman, Sydney

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That has some merit, but you will be required to utility mains interactive inverter and a bidirectional Watt Hour meter.

?-)

That has some merit, but you will be required to utility mains interactive inverter and a bidirectional Watt Hour meter.

?-) ================== We just got remote-reading electric meters. If installed upside-down they continue to read demand correctly and set one of the bits in the tampering word, unlike old electromechanical meters that run backwards if inverted. They appear to defeat "Net Metering" with grid-tie inverters.

The three-dot pattern represents the spinning disk. The pattern changes for every Watt-hour consumed.

-jsw

That's why Clair said "usually". Its a dumb idea so it is "usually" not done but he left it open because some nutcase probably has done it. It's cheap to stick it back in a battery (perhaps cheaper than dissipating it). It's not cheap sticking it back on the AC line and there is little need.

Of course there is. Many DC motors run from an AC source rather than batteries. Decelerating an overhauling load without throwing the energy away as heat requires that the energy be returned to the source. In fact, one of our customers manufactured hydraulic motors which they wanted to test by loading them. It was done with our regenerative drive.

Then why did you ask?

No, you can buy a DC motor controller that includes the two thyristor bridges for full 4-quadrant operation.