Actually SR motors DO NOT use sine waves-they use a square wave pulse to the stator windings.The SR motor rotor is a cogged laminated iron-no windings of any sort.The square wave pulses magentize the rotor "cogs" on opposite sides of the rotor.As the sequence continues-the motor rotor rotates.And these motors can work like on a wide range of square wave pulse frequencies-then a wide speed range.The width of the wave can determine the torque of the motor.The concept of these was derived a century ago-but took modern tech to make the motor work.The board converts the sine or even DC input power to variable frequency and width square waves to work the motor.If you tried to run the SR motor on sine wave power-it would probably burn up.Cordless Dyson vacuums use these motors-their boards run from the DC power of the vacuums batteries.For AC powered appliances the incoming AC is rectified and converted to the pulses to run the motor.Thermomix blenders are an example of AC powered SR motor.New Rainbow E2 vacuum cleaners use SR motors.Also the motor has "position indicator" windings to feedback to the board so the square wave pulses can be fired in proper sequence.
Frigidaire DW motors
- Thread starter Chetlaham
- Start date
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vacerator
Well-known member
Rex,
thanks for the tutoring. I did not know that.
I am only familiar with the C-sine type of DC motor in miniature.
A few of my Marklin ho scale locomotives have them.
They run so smooth at low speed.
As they were very costly to make, commencing with the recession, they changed the design to a compact can style, and at first there were some problems with pcb board compatability. This explains it maybe.
Note that the Marklin ho is a three rail 16 volt A/C system, so even their armature and commutator older motors were rectification equipped since the early 90's for digital operation.
Now they even have RFID recognition chips. As soon as a loco is placed on the rails, the control unit screen or your computer screen shows which one it is.
There are two rail DC systems also for 12 volt 2 rail DC.
thanks for the tutoring. I did not know that.
I am only familiar with the C-sine type of DC motor in miniature.
A few of my Marklin ho scale locomotives have them.
They run so smooth at low speed.
As they were very costly to make, commencing with the recession, they changed the design to a compact can style, and at first there were some problems with pcb board compatability. This explains it maybe.
Note that the Marklin ho is a three rail 16 volt A/C system, so even their armature and commutator older motors were rectification equipped since the early 90's for digital operation.
Now they even have RFID recognition chips. As soon as a loco is placed on the rails, the control unit screen or your computer screen shows which one it is.
There are two rail DC systems also for 12 volt 2 rail DC.
frigidaire pumps
I noticed that the BOL model frigidaires have a single speed pump while the TOL models have a variable speed pump. Why is that?
I noticed that the BOL model frigidaires have a single speed pump while the TOL models have a variable speed pump. Why is that?
vacerator
Well-known member
Frigidaire is
under the upcharge of Electrolux. Entry level professional line, Electrolux, and Icon.
under the upcharge of Electrolux. Entry level professional line, Electrolux, and Icon.
Bosch
Question... Are Bosch dishwasher motors related to GE's BOL motors? The stator and back molding holding the bearings looks exactly like GE's, just made of plastic. See 4:50:
Question... Are Bosch dishwasher motors related to GE's BOL motors? The stator and back molding holding the bearings looks exactly like GE's, just made of plastic. See 4:50:
Better one
4:52:
4:52:
Oh, to add
It looks like you guys are right. I found this thread with a new GE dishwasher (congrats btw
) and the motor looks identical to Frigidaire's.
http://www.automaticwasher.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?49214
It looks like you guys are right. I found this thread with a new GE dishwasher (congrats btw
) and the motor looks identical to Frigidaire's. http://www.automaticwasher.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?49214
I always learn so much from these discussions
Especially about the changing motors which power so many of our vintage appliances.
This is a big part of what makes this site so fun.
Especially about the changing motors which power so many of our vintage appliances.
This is a big part of what makes this site so fun.
Knowledge
This place is bar none. Really eye opening.
As for variable speed pumps... one theory I have might be low water ususage. Some ultra high end machines from the past would actually cycle the motor every couple of seconds. The sump would fill, the motor would rev up sending water to the arms and then it would coast down for water to re-enter the sump. When it did it would rev back up again. If the motor rain continuously 2/3 of the time it would be pulling in air.
Frigidaire, at least their low end models over come this by using a diverter so only one wash arm can run at a time.
This place is bar none.
Really eye opening. As for variable speed pumps... one theory I have might be low water ususage. Some ultra high end machines from the past would actually cycle the motor every couple of seconds. The sump would fill, the motor would rev up sending water to the arms and then it would coast down for water to re-enter the sump. When it did it would rev back up again. If the motor rain continuously 2/3 of the time it would be pulling in air.
Frigidaire, at least their low end models over come this by using a diverter so only one wash arm can run at a time.
frigidaire pump rpm
So, I guess the pump on the Frigidaire fbd2400kw spins at about 3600 rpm's if I'm not mistaken. Please correct me. I also heard, however, that they spin at either 3100 or 3200 rpm's. Please correct me.
So, I guess the pump on the Frigidaire fbd2400kw spins at about 3600 rpm's if I'm not mistaken. Please correct me. I also heard, however, that they spin at either 3100 or 3200 rpm's. Please correct me.
