Controller for single phase brushless motor.

[nawait1]

Hi

I would like to make a controller for a single phase brushless motor.

Motor spec :

Input 12~24Volt, operating voltage 16.8Volt
Rotating speed 6000~12000rpm
Output power 10~20watt

This motor is for a vaccum cleaner, the speed has to be raised when the amount of dust increase.

I haven't found any information about the control of a single phase motor. If you have an idea, i am interested :)

Thanks

[Peterfly]

You should see the ventilation fan in computer case. It is brushless motor contolled by 1 IC, 4 pin.

[nawait1]

I have to make the controller by myself without using any IC.

[Peterfly]

thats amzing me

[Chippie]

Only single ph motors I know of are induction motors....speed control of one would be difficult I'd have thought....even more so if you cannot use ics....


Have a look here:

http://www.camacho.prof.ufu.br/pwtech01_24.pdf

[Martin_G]

Hi!

It would really be helpfull to know what type of motor it is.

e.g.
- Permanent magnet single phase motors like PC-Fans
- Shaded-pole motors with different kinds of rotors (squirrel-cage and the types that use the hysteresis of the rotor to run synchronous)
- Standard induction motors with a capacitor for the 2nd Phase

For the permanent magnet Version hall sensors are normally used to control the motor, the others should run with fixed frequency.

servus,
Martin

[nawait1]

Hi,

I am back after a while...

This is a Permanent magnet single phase motors. The speed need to vary, i think that the best way for the controller is to use a PIC. Could you help me, i don't really know how to proceed.

Thanks

[pilotpete2]

There are a couple of issues confusing me, first is, that I doubt that 10 to 20 watts will be adequate for creating sufficient vacuum to do any actual work and second, that I don't think you can make a single phase permanent magnet BLDC motor, the PC fan examples are 2 phase, a single phase design I believe would have no ability to start in the right direction reliably, sort of like the cheapy single phase AC synchronous motors (usually reluctance type) used in AC clocks (if you can still buy one :D ) they start in the wrong direction 50% of the time, they have a little plastic "kick back" pawl to reverse them when they start backwards.
Pete

[malibus]

Take a look at LB1862, single phase full wave brushless driver.
Essential elements are the H-brige and hall sensor.

For self-starting, the nuts of the stator(armature) have a special form.

[Ron van Sommeren]

@malibus, off_topic
Do you know any Bulgarian RC flight forums?

Vriendelijke groeten ;) Ron

[malibus]

Hi, Ron
enjoy: http://www.modelistika.com/index.php

[SteveM732]

Look over this app note (http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en022135) by Microchip. You'll see that some mechanism is needed to ensure the proper direction of rotation.

EDIT: You'll also find a lot of good info in this thread (http://www.rcgroups.com/forums/showthread.php?p=594518), including a schematic with part numbers.