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10 votes
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How can single phase induction motor's direction be reversed?

Typically reversing the fan motor is done like this, an SPDT switch changes which end of run capacitor is connected to the feed, and in doing so changes which winding sees the advanced signal. ...
Jasen  Слава Україні's user avatar
5 votes
Accepted

Review my power MOSFET motor control circuit - rev4

C should give about 500ms on/off smoothing No such thing. C will just form a tank with motor's inductance and will oscillate, not smooth. You want a snubber to keep the motor turn-on and turn-off ...
Kuba hasn't forgotten Monica's user avatar
4 votes
Accepted

Salvage Washer Motor

Looks like it's a 3-phase BLDC motor. The OEM controller is shown here. You might be able to substitute a commercial VFD for the OEM controller, but they are fairly complex devices. Here you will ...
Spehro Pefhany's user avatar
3 votes

Review my power MOSFET motor control circuit - rev4

Q1 and Q2 are always on so motor will be off. And something fries when Q3 or Q4 is turned on. If the drive signals come directly from Raspberry Pi GPIO, the 3.3V signals barely turn on the NFET.
Justme's user avatar
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3 votes

How can single phase induction motor's direction be reversed?

My concern with Andy aka's solution is that when the capacitor is moved from the aux winding to the main winding, the current in the aux winding may increase, and that increase may be beyond what the ...
Math Keeps Me Busy's user avatar
3 votes
Accepted

Can I run two motors using a shared common conductor?

Electrically it's possible. I'm assuming the transformer outputs (and motor inputs) are not grounded, and that the cable is thick enough for the currents that will flow.
Jasen  Слава Україні's user avatar
2 votes

Vending machine motor: simple DC motor with microswitch, one revolution

I work on these units, testing and repairing them for in-service vending machines. Have restored hundreds of them. Couple of things, the most common issue is that the microswitches become excessively ...
Steve McDonald's user avatar
2 votes

Review my power MOSFET motor control circuit - rev3

Q1 is upside down. So is Q4 and Q6: - Once you have corrected the MOSFET positions, the external diodes (D1 to D4) won't be needed due to the internal bulk diodes in the H-bridge MOSFETs. You also ...
Andy aka's user avatar
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2 votes

Safely using a "switching power supply" with 220V raw wire input

The power supply is meant to be inside an enclosure which prevents anyone from coming into contact with exposed mains terminals. These are not intended for using as-is on your table or mounted on wall ...
Justme's user avatar
  • 149k
2 votes

What ESC matches criteria?

Just looking at the photo, I see three wires for the 3-phase motor (A, B, C), three for the PWM signal input (receiver) and two for the battery (+ and -). There are no Hall sensor inputs on this ESC; ...
Spehro Pefhany's user avatar
2 votes

Salvage Washer Motor

You are going to need either a capacitor (aka a "run" capacitor) hooked up to the unused lead to create a virtual phase for the motor. Or, a centrifugal switch that opens after a certain RPM ...
MOSFET's user avatar
  • 3,245
2 votes

BLDC motor with hall effect sensor

You need a pull-up resistor on each of the hall outputs. They are open-collector.
John Birckhead's user avatar
1 vote

Review my power MOSFET motor control circuit - rev3

As the processor's outputs toggle and drive the (relatively large) gate capacitance of the MOSFETs, there will be a brief interval when (e.g.) Q1 an Q3 are on. This will consume very large current ...
jp314's user avatar
  • 19k
1 vote

Can I use an AC SCR to control a 180 V DC motor?

Your suggestion is cheap and it will control the speed. If it is good enough for your application then fine. Low speed may be a bit bumpy, the motor may buzz due to 100 Hz and harmonics there of. The ...
Autistic's user avatar
  • 14.7k
1 vote

Safely using a "switching power supply" with 220V raw wire input

That kind of screw terminal is common on UL and ISO certified power supplies. There is a barrier between terminals, and it's likely more than the 1 mm barrier required for 220 volts, just by looking ...
Voltage Spike's user avatar
  • 82.8k
1 vote
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Review my power MOSFET motor control circuit

Basically it's highly naïve and fails to understand how a MOSFET works. The problem in a nutshell is that the upper MOSFETs are driven as source followers and, given that the gate voltage cannot be ...
Andy aka's user avatar
  • 458k
1 vote

How can single phase induction motor's direction be reversed?

how can my fan spin the other direction Well, I can't tell you precisely how they do it in your fan but consider this as a possibility: - You swap the windings over. Use the capacitor on the regular ...
Andy aka's user avatar
  • 458k

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