Problem with switching direction on a AC motor

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  #1  
Old 08-28-20, 10:10 AM
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Question Problem with switching direction on a AC motor

Hello,
i have this AC motor here, see picture, and wired iit like in the second picture.
Now when I turn it on , it works ok in one direction but when I wanna change the direction and turn the switch in the other position to change the direction, the motor will keep spinning the the first direction. I have to flip the switch several times before it finally change the direction.
Any ideas what could be the problem?
Thank you


 
  #2  
Old 08-28-20, 11:04 AM
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suspect the motor some of those small gear motors dont reliably run in only one direction.
 
  #3  
Old 08-28-20, 03:37 PM
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Your schematic shows a DC circuit and the motor is marked for AC operation.
 
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Old 08-28-20, 06:16 PM
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My guess is the motor is still spinning with enough inertia when you change the rotation switch so the motor continues in the same direction. Suggest 3 position switch (CW-OFF-CCW). Put the switch in the off position long enough for the motor to stop rotating before changing rotation.
 
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Old 08-28-20, 07:40 PM
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The motor needs stop or almost stop before it will change direction.
 
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Old 08-28-20, 11:09 PM
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I have a 3 position switch and I know that the schematic is for a dc motor.
Even if you stop it for 2~5 sec. will it not all the time changing direction.
 
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Old 08-28-20, 11:10 PM
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You cannot just reverse the two input wires to reverse the direction on AC motor.
I have a feeling that motor will start in either direction and you cannot externally change it.

You'd find this type of motor in a microwave oven on the platter where rotation isn't critical.
 
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Old 08-29-20, 06:18 AM
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How many conductors are in the motor cord?
it does show a CW/CCW stamp. Does that blue lever have a known function?
 
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Old 08-29-20, 09:43 AM
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So I just wired a normal on off switch to the motor and every time you turn it on the motor changes direction. So I don’t think it matters how you wire it it will always change randomly the direction.
 
  #10  
Old 08-29-20, 01:28 PM
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Can you provide a photo of the wires coming out of the motor?
 
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Old 08-29-20, 10:01 PM
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You can find those motors all over ebay. There are only two wires. A motor that specifies one direction will always start in that direction. A motor specified as dual direction can start in either direction. It would be just like a coin toss as to which way it started.

If you need a true reversible system you'd need to get a three wire motor or switch to DC w/DC motor.

Motors from China
 
  #12  
Old 08-30-20, 06:08 AM
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Pete, you're correct about the motors starting in either direction. Like in the microwave. But I don't believe it's random. Every time I open the microwave door during a "cook" it will reverse direction.
 
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Old 09-01-20, 03:43 PM
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'Late to the party' again, but did anyone notice that the schematic is for a DC motor?
 
  #14  
Old 09-01-20, 05:36 PM
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late to the party. Yes, post 3 and we are two drinks ahead of you.
 
 

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