My 12V DC Vending Machine motor rotates 1 extra 360 degree rotation sometimes.

sugandha123 · Sep 19, 2019

I have done some changes with the Motor to work with the micro limit switch.
But the problem is sometimes the motor rotates 1 full 360 degree rotation which is perfectly fine but sometimes motor rotates 2 full or 1 and half rotation which is wrong. I do not know the reason.

I have attached the circuit diagram and shared the link of video as well

Here is the image

Here is the video

https://drive.google.com/open?id=1N7ItjeU84JiDAOquAD6SGHkVWufDT40K

https://drive.google.com/open?id=1VX9yncrm6pcr1IBQsNvVZ1yR0UMflJKA

srizbf · Sep 19, 2019

The attached block diagram does not give any clue on your design.
Attach a circuit diagram if possible or a clear block diagram and mention your requirement.

BradtheRad · Sep 20, 2019

Your Google.drive links do not play a video. Instead they require permission which I was unable to obtain.

sugandha123 · Sep 23, 2019

I have given the permission

- - - Updated - - -

srizbf said:
The attached block diagram does not give any clue on your design.
Attach a circuit diagram if possible or a clear block diagram and mention your requirement.

Here is the clear block diagram

I hope everything is clear and now you would help me.

BradtheRad · Sep 23, 2019

Your videos are visible now.

Your mechanism looks like the sort of thing that might have a cam or gear with a notch in it. If it doesn't stop after a cycle, it skips the notch and continues for a second cycle.

The natural question to ask: What makes your motor start a cycle, and what makes it stop?

Measurements are precise with a microswith. It needs to be positioned exactly right, and be pressed just right, in order to work reliably.

sugandha123 · Sep 23, 2019

BradtheRad said:
Your videos are visible now.

Your mechanism looks like the sort of thing that might have a cam or gear with a notch in it. If it doesn't stop after a cycle, it skips the notch and continues for a second cycle.

The natural question to ask: What makes your motor start a cycle, and what makes it stop?

Measurements are precise with a microswith. It needs to be positioned exactly right, and be pressed just right, in order to work reliably.

Hello

Motor Micro limit switch Common is connected to ground (ROW pin of the main board) and NO NC pin of this micro limit switch is connected to Column pin of the main board which has 12V when a signal comes.

To start a cycle of the motor when we give input to the column, switching is done on the main board and column pin switches to 12V then motor starts and when one cycle is complete and micro limit switch presees, mainboard reads the value and stop the motor.

KlausST · Sep 23, 2019

Hi,

Depending on microswitch wiring...at STOP position:
* it can make the motor to free run (open)
* or it can make the motor to break (short circuit)

Maybe in "free run" it passes the notch and starts again..

Klaus

sugandha123 · Sep 23, 2019

KlausST said:
Hi,

Depending on microswitch wiring...at STOP position:
* it can make the motor to free run (open)
* or it can make the motor to break (short circuit)

Maybe in "free run" it passes the notch and starts again..

Klaus

Hi

Can you tell me what should be the micros switch wiring so that it will be stopped after one round.
I have attached the block diagram of existing circuit. please suggest

KlausST · Sep 23, 2019

Hi,

I just recognized that your wuring diagram shows the microswitch NC and NO to be shorted. This makes no sense, it makes the switch useless, because the current is never stopped from flowing, either it runs through NC or NO, one of these paths is always closed.

Try to use NC only.
If it does not work: try to use NO only

Klaus

BradtheRad · Sep 23, 2019

* Does your motor draw so much current that it causes the supply voltage to droop?

* Does you motor create noise (glitches) on the supply rails?

Either of these can cause faults in a control circuit.

sugandha123 · Sep 23, 2019

KlausST said:
Hi,

I just recognized that your wuring diagram shows the microswitch NC and NO to be shorted. This makes no sense, it makes the switch useless, because the current is never stopped from flowing, either it runs through NC or NO, one of these paths is always closed.

Try to use NC only.
If it does not work: try to use NO only

Klaus

I have used NO but again Motor does not stop when micro switch press.
NC didn't work

- - - Updated - - -

KlausST said:
Hi,

I just recognized that your wuring diagram shows the microswitch NC and NO to be shorted. This makes no sense, it makes the switch useless, because the current is never stopped from flowing, either it runs through NC or NO, one of these paths is always closed.

Try to use NC only.
If it does not work: try to use NO only

Klaus

I have attached an image of different motor which uses the exact circuit diagram (NO and NC short) which I have followed and it works fine completely but not mine.

sugandha123 · Sep 23, 2019

BradtheRad said:
* Does your motor draw so much current that it causes the supply voltage to droop?

* Does you motor create noise (glitches) on the supply rails?

Either of these can cause faults in a control circuit.

My motor takes around 200mA Max.
Motor does not create noise

Kajunbee · Sep 23, 2019

sugandha123 said:
I have used NO but again Motor does not stop when micro switch press.
NC didn't work

In your diagram both motors are connected to NO and NC. Did you disconnect one motor , or did you just remove one or the other connectors on microswitch.

sugandha123 · Sep 23, 2019

Kajunbee said:
sugandha123 said:

I have used NO but again Motor does not stop when micro switch press.
NC didn't work

In your diagram both motors are connected to NO and NC. Did you disconnect one motor , or did you just remove one or the other connectors on microswitch.

Click to expand...

I have changed the microswitch connections only

sugandha123 · Sep 24, 2019

Kajunbee said:
sugandha123 said:

I have used NO but again Motor does not stop when micro switch press.
NC didn't work

In your diagram both motors are connected to NO and NC. Did you disconnect one motor , or did you just remove one or the other connectors on microswitch.

Click to expand...

I had one another motor which has different connections so I decided to changes its connection to make it exactly the other wine (White motor)

- - - Updated - - -

KlausST said:

Hi,

I just recognized that your wuring diagram shows the microswitch NC and NO to be shorted. This makes no sense, it makes the switch useless, because the current is never stopped from flowing, either it runs through NC or NO, one of these paths is always closed.

Try to use NC only.
If it does not work: try to use NO only

Klaus

Click to expand...

I have main board which has motor control circuit and has row and column to control the row and column of the vending machine.

I have made changes in motor in two ways:

A. I have attached an image for circuit diagram

In this design I have some pros and cons

PROS: 1. It stops at its home position after one rotation
2. It detects row and column of the machine

CONS: 1. Sometime it does not stop at its home position or take more than 1 rotation

B. I have attached an image of other diagram

In this design also I have some pros and cons

PROS: 1. It stops perfectly at its home position after one rotation.

CONS: 1. It does not detect ROW

Please suggest What should I follow and what should I made changes in the circuit.

srizbf · Sep 24, 2019

sugandha123 said:
...

I have main board which has motor control circuit and has row and column to control the row and column of the vending machine.

I have made changes in motor in two ways:

A. I have attached an image for circuit diagram
View attachment 155674

In this design I have some pros and cons

PROS: 1. It stops at its home position after one rotation
2. It detects row and column of the machine

CONS: 1. Sometime it does not stop at its home position or take more than 1 rotation

Test with the above option A with the following changes:

-Connect to NC contacts.

-Remove the 100 microfarad capacitor.

sugandha123 · Sep 25, 2019

srizbf said:
Test with the above option A with the following changes:

-Connect to NC contacts.

-Remove the 100 microfarad capacitor.

Connect to NC contacts means?

I have shorted NC NO contacts.

Actually I have another Motor which has same circuit and works completely fine with NO NC shorted.

So I decided to replicate my motor to that Motor but my motor does not work exactly same like another motor.

sugandha123 · Sep 25, 2019

srizbf said:
Test with the above option A with the following changes:

-Connect to NC contacts.

-Remove the 100 microfarad capacitor.

I have removed the capacitor but again facing the same issue.

Kajunbee · Sep 25, 2019

sugandha123 said:
I have removed the capacitor but again facing the same issue.

[video]http://www.nls.net/mp/volks/schem/wiper.htm[/video][video]https://electronics.stackexchange.com/questions/395162/vending-machine-motor-and-switch-circuit[/video]

I see that the pcb on motor in your video is different than one in photo.

sugandha123 · Sep 26, 2019

Kajunbee said:
[video]http://www.nls.net/mp/volks/schem/wiper.htm[/video][video]https://electronics.stackexchange.com/questions/395162/vending-machine-motor-and-switch-circuit[/video]

I see that the pcb on motor in your video is different than one in photo.

PCB on video and on photo is not different.
I have changed the circuit which is shown in video and my circuit diagram too which I already posted on this group.

My 12V DC Vending Machine motor rotates 1 extra 360 degree rotation sometimes.

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