12v 120 Amps Car Alternator converted to DC Motor ( 1500 Watt High Torque ) - with BLDC Controller 

Good morning

Thanks

The field coil should be voltage adjusted based on rpm, between 5-12 volts depending on if it's running at low rpm or high rpm.

Thanks James !

As a motor the efficiency depends on rpm, at low rpm the max voltage you can get without saturating will give you the highest output power, as rpms rise you want to drop the power to the field to reduce back emf and give more efficiency at higher rpm. For example at full 12v you may only have 2500 rpm max , it if you drop the field voltage to 5 volts it's possible you might get closer to 3-4000 rpm with the same controller. Pulsed dc to the field would be less effective, yes it can handle it but that's simply because that's what old style regulators used to use to regulate power (basically a relay that would turn off the field when the battery charge voltage was reached and turn the field coil back on when the voltage dropped to low for battery charging) but using a consistent voltage to the field would be more efficient, you just need different electronics than a relay.

Some chargers are 15v and considering the full load current flow , voltage drops to 12v

Well that's bad... It has been more than a year since i bought it. They might have modified it to bring down the production costs.

I will txt you the link when i find the required controller of rating 150 A or more.

@@MrElectron . Thank you for your reply and I will appreciate your help.

Hi! I did some digging. 38 Amps is the max that is available in the no hall type.Perhaps if the a 24v volt or 48v alternator is available then the required current will decrease automatically. Anyways, my employees are still looking.If it gets available, i will text you. Link for 38A hall or no hall type : [₹3,232.67]48V to 64V 800W Electric Bicycle E-bike Scooter Brushless DC Motor Speed Controller Electrical Equipment & Supplies from Tools, Industrial & Scientific on banggood.com banggood.app.link/mTXboCav5W

Although this controller has higher volt rating so its not suitable for your purpose.

@@MrElectron Thank you for all of your efforts.

36v should be okay, but for the magnets max 12volts

Technically, if you just remove the armature and install a permanent magnet in its place, it truly becomes a brushless motor. There’s videos of that being done The armature and brushes are just there to create the needed magnetic field

Make BLDC Controller : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZGBTyr51I7Q.html

@@MrElectron thank you alot

can I increase to 150 AMPS with 12v using this Car Alternator

I didn't get your question

@@MrElectron upgrade the Amps from 120 Amps to 150 Amps

You're probably using a sensorless controller built for smaller BLDC motors. What's happening is that the switching frequency is so high that it skips over most windings, resulting in poor performance. And it's shutting down as it's not recieving proper feedback from the other phases as it's too fast. Either make or buy a sensored driver circuit. It would have extremely low torque and would need turning over to "sync".

It's pulsed dc timed between those three wires based on the phase angle of the rotor. It would be more efficient to use 3 phase ac because the windings overlap, in an alternator the windings overlap while in a bldc the windings don't overlap. This is why in an alternator the output is a sinusoidal wave form while in a bldc the output (back emf) is trapezoidal (basically pulsed dc).

There's no way you're using this on 120 or 240V AC. First, the US power system only has two phases and a neutral. These phases are 180 degrees out of phase. An alternator is for low voltage only. You need a 3-phase driver circuit and a big 3-phase step down transformer to use. Just use an induction motor made for the job..

That's a different video.

any thing is possible with electricity

Reply fast bro

no

Of course, but not directly. You need a driver circuit. Either buy it or make it.

Some are easier than others, for example it's difficult to turn a series wound motor into a generator.

The field voltage depends on the room range that you want. Lower rpm and higher torque means higher field voltage (8-14 volts) while if you want higher rpm and don't need as much torque you can use a lower field voltage (4-7 volts). I usually use a bldc controller (esc) with a BEC. That stands for battery eliminator circuit, it provides about 5 volts which is a good number for general purpose projects using an alternator as a motor.

If you can find a way to attach the motor and pulley then absolutely. As long as the blade isn't too big and you don't cut too big of lumber it should work just fine.

I used one to power a drill press with a dead motor, and another to power a CNC spindle.

@@lazyh-online4839 Thanks .

Plz reply

@@mmk4854 what do you want to know?

@@lazyh-online4839 sir can alternator motor used in e bike

@@mmk4854 yes, there's tons of videos on RU-vid of people putting them in ebikes and go carts and the like. depending on the alternator you can get over 20 horsepower out of it as long as you have a good enough controller.

@@mmk4854 what more would you like to know about the alternator motor?

The force when the rotor turns. Try to hold onto a rotor with your hands when it is turning, and try to stop it with your hands from turning. If the torque is low, your hands can easily stop the rotor from rotating. If the torque is high, your hands will not stop the rotor from turning.

03048349892

True, in a bldc the coils are isolated which gives a trapezoidal back emf waveform, while in an alternator the coils overlap which gives a sinusoidal back emf pattern, which means it's more accurate to call it a synchronous ac motor rather than a bldc equivalent.

@@lazyh-online4839 exactly my point

@@vinesnation7202 yep, that's why I was agreeing with you.

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