Adjusting 220V 1.1KW Single-Phase Motor Speed from 700 to 1400 RPM Smoothly

Hello.
At the outset, I note that I am green in electricity and electronics.
My question is how to easily and cheaply adjust the speed of rotation of a 220V motor with a power of 1.1KW 1400 rpm. It would be best if it was a smooth adjustment, e.g. from 700 to 1400 revolutions. What to buy and how to connect? Regards.

Hi. You haven't written what a three-phase single-phase inductive motor or a single-phase commutator motor is. For a commutator, the adjustment can be done easily on the U2008B chip, for the rest you need an inverter.

It seems to me that it is a single phase because I power it on 220V (if it works well?) I have no idea about the rest. Maybe the photo will dispel doubts (my engine is almost identical)

It's a 1-phase motor. You can't do without an inverter.

The inverter is no longer present. And what does this case look like in drills? Would it be possible to deal with a switch from a 220V drill?

The motor from the drill is a commutator motor, which means it has brushes. AND YOU have a squirrel-cage induction motor and with this type of motor you need to regulate the frequency and voltage at the same time, and this gives an inverter. The controller such as in a drill regulates only the voltage and is not suitable for squirrel-cage motors like you you have.

Commutator motors are used in drilling machines. They can be adjusted by changing the supply voltage. You have a squirrel-cage induction motor, which is controlled by an inverter by varying the speed of the rotating field.

Transferred from: "Other"

If you don't want an inverter, it's a gear motor. or do yourself something like in bench drills (but to change the speed you will have to change the belt).

Hello

If it is a motor with a capacitor and works at low loads, triac control can be used. Such systems will detach various companies, including this one:
http://www.lumel.com.pl/pl/oferta/aparatura_p...jna/sterźniki_mocy_przekazniki_pol/art88.html

You can also do the adjustment system on the triac yourself. The disadvantage of such a solution (triac or thyristor bi-directional switch) is the lack of smooth regulation from zero. In addition, this solution is suitable for systems with low loads such as fans, blowers, air extractors, etc.

daduszeryf wrote:

And YOU have a squirrel cage induction motor and with this type of motor you need to regulate both the frequency and the voltage, which is what the inverter gives.

tension?

Hello
I do not want to start a new thread, so I will step on the existing one.

I have a 0.25kW (2800 rpm) 1 phase induction motor with a capacitor in a glass cutter. Unfortunately, it has no speed control. I recently found out that in 1-phase it is impossible to regulate the rotation with an inverter, and in 3-phase it is (true or false?)

Which inverter do you recommend? and will it pass the exam in a single-phase induction motor ... I know that inverters are a thicker expense, but about PLN 300 I am able to give

thanks for the answers, best regards

Hi. False inverter can regulate both single and three phase motors. And even power three phase motors from one phase and regulate the speed.

ok, except that the inverter can supply 3 ~ motors from one phase, I knew, but I did not know if the single-phase would be too weak after speed control or the torque characteristics would drop drastically ...

Which inverter do you recommend?

For PLN 300 to PLN 500 you can buy an inverter adapted to these powers on Allegro

Gentlemen, how would you cut every second sine wave?
Will the turnover be reduced and a half when the frequency is reduced?
How will the engine respond?

before:

after:

Heh, but the idea is to cut the sine wave ??? By the way, how did they regulate the rotation of single and three-phase motors in times when there were no inverters and no one had even heard of a transistor? I wonder if anyone has heard about adjustable transformers (autotransformer), a patent as old as the world and reliable.

Hello,

I propose to use a frequency converter with a single-phase supply for single-phase motors:

http://www.directautomation.eu/show,50,122,17.html

greetings

Hello everyone, I have a question if a brine regulator can be used
because once upon a time saw one in an amusement park to regulate the speed of a carousel.
The guy had a 3-chamber plastic container, and a plastic cover on the top
from which 2 trays protruded into the chamber. When he lifted the cover, the sheets were uncovered
out of the water and the carousel slowed down and when it left it accelerated
how deep they were immersed so it spun.

wielgus wrote:

Hello everyone, I have a question if a brine regulator can be used
because once upon a time saw one in an amusement park to regulate the speed of a carousel.
The guy had a 3-chamber plastic container, and a plastic cover on the top
from which 2 trays protruded into the chamber. When he lifted the cover, the sheets were uncovered
out of the water and the carousel slowed down and when it left it accelerated
how deep they were immersed so it spun.

Such a regulator works with a ring motor !!! Completely different rotor structure.
You won't do anything with this resistor for the squirrel cage motor unfortunately.

Hello,
as yes, because I am also looking for 1-phase motors with a work capacitor

doubt 1
There are a few of these motors, and as I noticed the differences in construction and connections, there are also - I mean a 1-phase motor with an AC-power capacitor

1. an article describing the 3 basic methods of regulation
http://systemyogrzał.pl/technologie/technologie.asp?id_artykulu=718

side of a good regulator
http://www.dasko.pl/index.php?a=24&b=112&c=1&e=

2. There are also the already mentioned 1-phase inverters
http://www.invertek.co.uk/product_optidrive_e21_products.aspx


but...
there is always a but

1.What is better and cheaper, even more reliable and preferably EMC = 0

2. what spr .. does a single-phase motor have? avr = 55%?
+ adjustment = 35% ~
-> unless this inverter does not reduce efficiency ....

Well, with a 1 kW motor, a new 3-phase motor + inverter and the assembly pay off after 8 months as we are talking about, for example, ventilation / S1 work / ???

PS
there was an interesting discussion on this topic
http://www.elektroda.net/uzytkowa/plmiscelektr/05_2000_2/05_2000_2169.htm
I can't find it on the forum, there's nothing like power of google ....

I would use a triac control, as already mentioned, and the more that the engine will not be loaded with a large torque. Below I present a simple 2.5 [kW] power controller, which you can buy for self-assembly:

http://www.sklep.avt.com.pl/p/pl/40017/regulator+obrotow+silnika+elektrycznej.html

Probably the KIT that I presented will have a limitation due to narrow paths, so the Triac should be connected directly with a thicker wire.

A cheaper solution would be to build an independent power controller based on the U2008 system, price PLN 4.6, however, you would have to design the board yourself, which is unlikely to be a problem due to the small number of elements, documentation below:

http://laro.com.pl/pdf/u2008b.pdf
http://laro.com.pl/index.php5/szukaj

Regards
Joahim_Skywalker

Added after 5 [minutes]:

In addition, I recommend the use of a temperature sensor that will be connected to the relay coil, and the relay, in turn, will be connected in series with the triac (of course, the appropriate current strength of the working contacts must be selected), which will protect the engine from overheating at low revs.

Colleague Joahim_Skywalker, this regulator will not work for an asynchronous or synchronous motor ... only suitable for all brush motors such as hand drills, mixers or vacuum cleaners ...

Added after 8 [minutes]:

My colleague, a 1-phase vector inverter would be enough ... It provides a large torque in the entire adjustment range, an important feature is the so-called soft satart function, they feel the slow acceleration of the motor to the set speed, it can be adjusted from the inverter panel or with the potentiometer attached to of the inverter after programming the reg options with the potentiometer ...

What about the capacitor in such a situation? After all, with a changed frequency, its reactance will change, so the angles between the voltage vectors in the starting and operating phases will change. If the motor was to operate permanently or for a long time at a reduced frequency and the author of the post cares about its efficiency, then the selection of a new capacitor should be considered.
As for triacs and other solutions of this type, in induction motors they have no use for changing the speed (they could at most regulate (lower) the torque). Here only an inverter or some mechanical solutions (gears) can help.
And with that sine-wave notch that would supposedly reduce the frequency, it's pretty buggy.

zwora wrote:

What about the capacitor in such a situation? After all, with a changed frequency, its reactance will change, so the angles between the voltage vectors in the starting and operating phases will change.

A fair point. Therefore, instead of an inverter for a 1-phase motor http://www.directautomation.eu/view,50,122,614,17.html
it is worth considering buying an inverter for a 3-phase motor
http://www.directautomation.eu/view,26,54,37,1.html
and a new 3-phase motor
http://www.directautomation.eu/view,11,18,14,7.html
With this "simple" move, we get rid of the problems with the capacitor (changes in reactance, sensitivity to higher harmonics) and problems with starting (the known problem of 1-phase squirrel-cage motors), we gain a 1-phase motor for other applications, and financially we go to about 0 ...

and by the way, nice driving ...
water resistance ...
autotransformer...
thyristor voltage regulator ...
People have forgotten that in the past, DC motors were used to regulate speed by more than a few%, or in a ring type rather than a cage motor. And it wasn't all that easy. I suggest you search, for example, in Wikipedia for the password "Leonardo's system"
(these comments, of course, to the collective, not the jumper)

The Leonard system is something completely different, it is used only in mine hoisting machines and in Diezel locomotives for high power DC motors.

cooltygrysek wrote:

I wonder if anyone has heard about adjustable transformers (autotransformer), a patent as old as the world and reliable.

He has heard, but you do not know at all that you are talking off topic, you can't autotraph.

I have a device equipped with three single phase motors. I would like to regulate the rotational speed of two of them. I have already dealt with one by connecting it to the 1-phase Invertek device. These Invertek frequency inverters are great because they can be controlled via the MODBUS protocol.

I have a problem with the second 1-phase motor. Unlike the first, it is a motor with two capacitors and a starting winding. Some control systems are connected to the motor ... Can the Invertek inverter be also used for such more complex systems?

You can use an autotransformer only within small limits.

But I need big boundaries .