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### Author Topic: Optimizing Power Drive Circuit from Core Material Hysteresis Curve  (Read 198 times)

#### Lunkster

• Full Member
• Posts: 176
##### Optimizing Power Drive Circuit from Core Material Hysteresis Curve
« on: May 26, 2023, 02:08:50 AM »
Optimizing Power Drive Circuit from Core Material Hysteresis Curve:

Design Goal:
The design goal is to optimize the power consumption in an electromechanical device like an electric motor.

Many AC drive circuits today:
When putting power into the core material of the drive coil while the device has a full load drawing from that circuit is very inefficient.  This is common place in most drive circuits today.  Most circuits today keep the load at a constant rate during the full power drive signal.  When you look at the hysteresis curve, the rate of flux change is very low at the start of the voltage and also at the point of the saturation of the core material.  Having the maximum output load during these places of the power drive cycle adds a lot to the inefficiency of the over-all performance of the system.

Optimize the AC drive circuit:
There are some prototype motor designs that pulse the power just during the maximum performance positions of the rotor to stator positions.  These designs are very efficient.
I am looking at a different way to gain efficiency in conventional motors and other electromechanical devices.  Instead of pulsing the input power to the drive coil, pulse the load of the device.  You need to be able to switch a low load consumption with a needed load consumption of the output circuit.  In this way the output load id being operated at the most efficient performance area of the core material.  This should create better efficiency rates for the device.
One way to do this is to switch in a series resistor in the load circuit when the core material is in a low flux change area of its curve.   I believe having the output load is at its maximum draw during this time is very non-productive for the efficiency of the device.  When the power is at the maximum change of flux area of the curve, then the output circuit can be switched into the maximum load configuration.  A similar action can occur at the saturation level of the core material.

Circuit:
With the high-speed circuitry today, there are many ways to accomplish this task.
I would like to know if this is even a good idea to look at.

I would like to know if there is a circuit that already does this?
Please post the best circuits at doing this if you know of them.

Lunkster

#### bistander

• Hero Member
• Posts: 591
##### Re: Optimizing Power Drive Circuit from Core Material Hysteresis Curve
« Reply #1 on: May 26, 2023, 03:29:38 AM »
Optimizing Power Drive Circuit from Core Material Hysteresis Curve:
...
I would like to know if there is a circuit that already does this?
Please post the best circuits at doing this if you know of them.

Lunkster

I think the present state of art variable frequency drives (VFD) and high efficiency NEMA motors have you covered. I suggest to get familiar with what the industry has to offer. Perhaps study an user's manual or two. Here is an example ad:
http://www.vfds.org/flux-vector-variable-frequency-drive-865015.html
If you feel up to it, purchase a low power (small) motor and drive and experiment with it. A fan or pump can be a simple load.
bi