Questions tagged [universal-motor]

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What does forward rotation of armature mean?

Does forward rotation of motor mean clockwise or anticlockwise?
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How can I determine rotation direction when rewinding armature coils

I want to rewind a burnt armature coils of universal motor. Which segment of commutator with respect to the armature slot should I begin with in order to make it rotate clockwise? I will apreciate if ...
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AC universal motor changed rotation direction after armature rewinding

I repaired the armature of my juicer machine by rewinding it because it got burnt. The machine should rotate clockwise in order to operate normally, but after rewinding, it is now rotating anti-...
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Most accurate way to measure universal (AC) motor current?

I'm designing a control circuit for a universal (AC) motor (single phase, brushed). I've simulated the control circuit and it works as expected. Circuit below is controlled by a STM32G4 series ...
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2 answers
141 views

Old sewing machine motor filter/capacitor schematic/wiring

I have an old Pfaff 97 sewing machine that suddenly started to run at full speed regardless of the pedal input. I disassembled and checked the foot pedal and it is working perfectly. I took out the ...
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Blender - Universal Motor Speed Control

I disassembled a blender and removed the motor. It is a universal-type motor, and it appears that there are different taps on the field coil for different speed settings (I never really understood why ...
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MOSFET failed when I connected an AC universal motor

I connected the following AC chopper circuit to control the brightness of a lamp and it is working as expected. Expected behavior: I observe that when the pulse is 0, the light is completely off. When ...
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universal motor wiring help needed

I have a NOS universal ac/dc motor and don't know how to wire it. The motor has 4 unmarked leads. Two black, one red and one white. The motor label is marked VOLTS 115, CYCLES 60, AMPS. 1.0, SER. ...
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Can a repulsion motor be connected like a series or shunt DC motor?

Recently I bought an old repulsion-start induction-run motor made by Asincron in Argentina, exactly identical to the one in this video. I can't find much documentation and information about how ...
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How do I control the speed of a universal AC motor and measure the voltage and current flowing through it?

It is desired to be able to control the speed of my rotary drill as well as measure the average torque (or is RMS torque a thing?) of the universal AC motor. I am using this torque equation: τ = (I * ...
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90 views

Speed regulation for universal motor

I'm building a grinder, which consists of a shaft on which the grinding wheels sit, and the shaft is driven by a universal motor out of a washing machine via a belt and a pulley. I'm using an off-the-...
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Universal motor DC vs AC which will give more speed and torque

I have shortlisted a universal motor for a DIY project requiring High speed and torque of the motor. Motor looks like below and some characteristics. DC Motor : Washing Machine Input Power: 750 Watt ...
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Reversed universal universal motor sparks and shows arcing even though brushes are completely perpendicular to the commutator

I need to reverse the rotation of the universal motor in question so I swapped the wires leading to the brushes and that successfully reversed the rotation, but now the commutator is arcing and is ...
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246 views

Proper soft starter for vacuum cleaner universal motor

According to this question: Max startup current for vacuum cleaner motor We have the problem of tripping the dental clinic circuit breakers during the starting the universal motor. I am trying to test ...
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1 answer
1k views

Sewing machine motor repair

I'm a sewing machine mechanic, trying to increase my electric motor knowledge. I have a Bernina 830 sewing motor where the carbon brushes ran down and the wire damaged the commutator and ran a groove ...
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Why is it an advantage that carbon brushes have 'high resistance'?

I recently heard that in a universal motor (and I'm presuming regular DC motors too) they use "high resistance carbon brushes", and I can't seem to find anywhere that explains why they need to use "...
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Universal Motor as a magnetic brake

Hello friends of stackexchange, I want to make a magnetic brake based on a universal motor from a Candy wash machine TYPE 20584.528. I suppose that the best way is to use the motor as a DC generator ...
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2 answers
1k views

How to wire an old single phase AC brushed motor to be reversable

I have searched several forums and found a lot of interesting stuff, but nothing yet that really applies to my situation. I have an old Westinghouse FH motor 1 1/2HP single phase brushed AC motor. ...
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Is there anything that can be done about this U5215 universal motor? [closed]

Recently my hairdryer stopped working properly. While drying my hair, the fan would suddenly turn off after a minute or two (it seems as if a thermal switch in series with the motor cut the current to ...
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isolation of Universal motor

Im working on a AC triac motor controller for universal motors For this I want to measure the motor current and the speed. For the speed the motor provides a tacho-signal. To isolate the measurement ...
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2 answers
985 views

Max startup current for Vacuum cleaner motor

We used the vacuum cleaner motor 2200W 220v in one dental device (vacuum former) as you can see here: So now one of our costumers said when they used this device the power cable is warmed and when ...
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1 vote
3 answers
450 views

How to make linear actuators go in both directions? (Using arduino/microcontroller)

I'm stuck here, I want to make the lineal actuators to go up and down, both of the actuators move to the same direction at the same time. The arduino receives a signal as input and then the ouptut ...
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4 answers
210 views

Phase control universal motor dimmer

I need to control the speed of a 220v universal motor using arduino and I am thinking to use an atteny85 ic with a phase control circuit (ltv814 to detect zero crosses and moc3052 to drive a triac to ...
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2 votes
1 answer
446 views

220V universal motor Arduino control

I bought a 220V 100W sewing machine motor to use in a project. I thought that the motor works only on AC because 220V is written on it, but I tried it with 30V Dc and surprisingly it spun. Is that ...
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2 votes
1 answer
547 views

I don't understand the windings inside my power drill. [closed]

I was curious about how my power drill worked and I disassembled it. I understand the general principles at work here but I don't understand why the winding is set up this way. I assume running ...
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Sizing Transistors for 2.2hp universal motor controller

my background is mechanical and as you can see I have just enough electrical knowledge to be dangerous. I have an application where I'm trying to use 2xFDP51N25 in parallel to drive a (2.2hp) ...
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1 answer
1k views

Universal motor as DC generator

I want to use universal motor as a DC generator. The motor specifications are 180 Watt 230 V 10000 rpm When I supply the motor with 3000rpm it gives 1.5V. I thought it was rpm problem but when I ...
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1 answer
368 views

small AC commutator motor issue

I have a small vacuum cleaner motor, single-phase, AC commutator motor, 120V, 4 A Max., series wired (all coils, brushes connected in series), no start capacitor, two-pole field stator, with thermal ...
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4 votes
2 answers
701 views

Serial diode to universal motor and brush lenghts differs on intermittent run, why?

A universal motor supposed to be run in two speed stages: full speed / reduced speed and motor will run on intermittent duty like 3 seconds ON / 3 seconds OFF. So simply I added a serial diode (BY255)...
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3 answers
2k views

9 wire universal motor

So I found an old washing machine and salvaged the motor. However I can't find any information about how to wire it because it has 9 wires coming out. So 2 of them are speed control = 7 to go. 2 are ...
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-1 votes
1 answer
195 views

Universal motor with non-sinusoidal wave

As everyone knows, the line voltage coming out of your wall is in the form of a sine wave. Universal motors are designed to be capable of running on both AC and DC since they are self-commutating. For ...
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2 votes
1 answer
610 views

Does a universal motor run better on flat DC as opposed to pulsed DC?

After reading this: Is there any advantage in running a universal motor on DC power? I want to know, does it improve the motor characteristics if you supply the motor flat DC instead of pulsed (...
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1 answer
3k views

How does this circuit control motor speed?

I was curious to see how the foot pedal of a sewing machine drives the universal (?) motor inside the appliance. I had expected a simple variable resistor like the ones in vintage machines but that's ...
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3 votes
1 answer
3k views

How does the power usage and voltage of a universal motor change when running on DC?

I have a 2400w universal motor from an AC powered garden blower (230V @50Hz here in Australia) and am wondering what voltage and power requirements it would require from a DC source to give roughly ...
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