Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Speed controller for AC motor (Beginner)

Status
Not open for further replies.
A

alexandergre

Newbie level 2
Joined
Oct 24, 2010
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,297
Hi, im new here. In my project im trying to assemble an AC motor and its rpm controller.

The AC motor is taken from a car heater, url:
jula.se/kupevarmare-600-1250-w-127977

So now I want to be able to control the rotation speed of the motor. What is the simplest way? the motor is 240V. If I connect it to wall sockt it works.

thanks
 

These heater fans are mostly using a shade-pole motor. It can be controlled to some extend with a phase angle control (as utilized in a light dimmer). Due to the fan load, the speed is some kind of self stabilizing. Some simple triac dimmer circuits sometimes have problems with inductive loads, some are even supplying DC voltage to it, you should have a fuse to protect the motor.
 

FvM said:
These heater fans are mostly using a shade-pole motor. It can be controlled to some extend with a phase angle control (as utilized in a light dimmer). Due to the fan load, the speed is some kind of self stabilizing. Some simple triac dimmer circuits sometimes have problems with inductive loads, some are even supplying DC voltage to it, you should have a fuse to protect the motor.
Click to expand...

I have removed the motor and now it looks like this.
The only thing I need now is to be able to control the speed. In you last post i didnt get much. can you still help me? like is there something I could buy from ebay to controll the speed?

i56.tinypic.xxx/a30fgl.jpg
Click to expand...
instead of xxx type com
 

Have you tried normal triac fan regulator??
 

In most cases, if you are varying the speed of an ac motor you need to have a variable frequency drive. If you introduce resistance into the circuit (i.e. using a light dimmer), you will reduce the torque-producing capability of the motor. AC variable speed drives can be quite inexpensive (under $50) for small power requirements (i.e. car heater motors) or can cost thousands of dollars for large current-handling variable ac drives.
 

If the motor is a synchronous type, which is most likely then a variable frequency drive is best way, but thats a bit much for a beginner, a dimmer circuit might work, you'll probably need to wind the output up to start the motor then down to the required speed.
If its a universal motor then the dimmer circuit will work well, or you can look inisde the motor where the brushgear is, if the plate that the brushes fasten to is rotateable then ratating this will control the speed and even direction.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top