mosfet driver needed for logic-level mosfets?

Started by Anonymous in sci.electronics.basics3 years ago 43 replies

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an...

Hello, I've discovered logic-level mosfets, and am using an Arduino to drive a small 12VDC (about an amp or so) pump motor with PWM, using an IRLZ34N as the power mosfet. Would a mosfet-driver be recommended to switch that mosfet on and off more quickly? Or is a logic-level mosfet already designed to efficiently turn on and off with the weak logic level signal? Thanks, Michael


how to get this PWM DC motor control to handle more power

Started by causalitist in sci.electronics.basics11 years ago 16 replies

this is the circuit in question, page 3 is the part I'm asking about, not the PWM circuit on page 1,2: http://kitsrus.com/pdf/k166.pdf The...

this is the circuit in question, page 3 is the part I'm asking about, not the PWM circuit on page 1,2: http://kitsrus.com/pdf/k166.pdf The IRF4905 and IRFZ44 limit current to 74A and 49A respectively. The LM324 Quad op-Amp limits Voltage to 32V What is an op-amp that will work here, but be able to handle 100v or maybe 55v min? As far as current and total wattage , I'm looking for min ...


All Ob A Sudden, Starter Motors Is So Small & Light You Can Carry 'em Home In A Filmy Shoppin Bag

Started by Bret Cahill in sci.electronics.basics5 months ago 4 replies

Summin didn't look right. The replacement starter motor was 2/3rds the dia of the original, mebbe haf the wait. I tink, WTF? Weren't all them...

Summin didn't look right. The replacement starter motor was 2/3rds the dia of the original, mebbe haf the wait. I tink, WTF? Weren't all them optimum nummers well settled back in the early Nicolacene? I toght, heck, no need to strap it onto the bike rack. I'll just stick hit into a shoppin bag. Affer an easy installation, the thang _akutually werked._! Affer about 2 days a theory he...


Electric Motor Cost/Watt Is Impervious To Size

Started by Bret Cahill in sci.electronics.basics3 years ago 4 replies

There doesn't seem to be much in the way of economies of scale when it comes to the cost/watt of electric motors. Most 50 kW motors cost...

There doesn't seem to be much in the way of economies of scale when it comes to the cost/watt of electric motors. Most 50 kW motors cost between 6 cents / watt and 20 cents / watt. Most 1 kW motors cost between 6 cents / watt and 20 cents / watt. Is this simply a matter of materials volume/ weight and therefore costs are linear with power? Bret Cahill


Anyone here know BLDC motors well? Hobby ones particularly?

Started by Anonymous in sci.electronics.basics2 years ago 5 replies

I want to use a hobby BLDC motor to power a compact high speed spindle to be used for engraving and the like. Mainly because they are so...

I want to use a hobby BLDC motor to power a compact high speed spindle to be used for engraving and the like. Mainly because they are so compact for the power and speed. I cannot find, for a price I can justify, a 24,000 to 40,000 RPM spindle that will fit in the space I want to put it. Looking at some hobby BLDC motors and then buying some to experiment with leads me to think that on...