Cycle time for 5hp well motor


I need to bed-in the new brushes on a 12V (7W) DC motor, according to these specs: "CW rotation for 10-12sec, pause for 10-12sec, CCW rotation for 10-12sec. Procedure to be repeated over a period of 10-12Hrs". Can anyone help me with a simple circuit to do this? Pots to adjust interval times would be nice, and on/off switch. I have a simple regulated power supply to drive it... Really hope you can help.

Don't know how much you want to spend, and the cheapest route in terms of component cost would probably be with discrete ICs, but, in that you are asking the question, probably outside of your current experience. What I would do - if only because I haven't designed such things from the chip level for a number of years, and would need to bone up on the details again - is get a "micro" controller such as a Siemens 230R Logo! to do the timing and sequencing logic, and a couple of miniature relays (one for 'DriveRun', and the other for 'Fwd/Rev' direction) for power...

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As the exact Name plate readings are not Mentioned
Assumptions for worst case scenario, since the battery has to supply for all cases.
1.You have a Inverter to convert Dc to Ac
Lets say its efficiency is 90%,
Reason : I just saw the specifications of some inverters available in market, good inverters are 90%.

2.Power factor of the Operating Induction Motor is 0.85
Reason :The power factor of induction motors varies with load, typically from around 0.85 or 0.90 at full load to as low as 0.35 at no-load, due to stator and rotor leakage and magnetizing reactance

3.The motor full load efficiency is 85%
Reason : Full load motor efficiency varies from about 85 % to 97 %, related motor losses being broken down roughly as follows:
Friction and windage, 5 % – 15 %
Iron or core losses, 15 % – 25 %
Stator losses, 25 % – 40 %
Rotor losses, 15 % – 25 %
Stray load losses, 10 % 20%. ...

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Hello All,

I am looking to make a whole house fan. I have a 1.5hp 115V single phase motor. Nominal rpm is 3600. I have fan blades for it from a 220v 1/10hp that is 800 rpm. I would like to control the 1.5hp motor to a max of 1000rpm, but also be able to have a low speed (maybe 300rpm).

I would like to do this using a PIC controlling a relay that would open and close as necessary for the PWM. I don't have any experience using any of this, so opinions on the setup would be appreciated.

It seems as if a PIC would have no problem switching power on and off to the relay quick enough, but would the relay respond fast enough? I will have to test, but I think it will have to cycle maybe 5 to 10 times a second to control the speed properly. Is a solid state relay the best choice or is there another type that I'm not aware of that would work better?

Other issues I have to work through is that this motor has start and run capacitors. Obviously I have to remove the run...

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Choosing the right small outboard on a limited budget and avoiding the pitfalls, is not an easy task for the first time buyer. This task becomes confusing due to the many decisions that need to be made, such as: New vs used, 2 cycle vs 4 cycle, weight and length, propane gas, air cooled, water cooled, Chinese vs Japanese imports (since America no longer manufactures outboards), 3 year vs 5 year warranties, free shipping and returns.
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