Motor keep on rotating for long time even if power off/motor pins short

[Vindhyachal.takniki]

1. I have purchaes a motor from local market. It don't have any part number on it(scratched out). Local market person syas it was used in earlier walkman.
On internet I had checked my motor looks like this, but shaft is bit longer:
http://www.aliexpress.com/item/hot-sale-15pcs-Mabuchi-Walkman-motor-repetition-machine-motor/32263326923.html


2. This motor runs even at 3.3V with very good speed, ther is no big load on it just very small tyre. Currently I am running at 12V, load is around 800mA by motor & its load.
Problem is when motor is stopped, then keeps on rotating after for long time. I want to stop motor at once when MCU stops PWM.
I have alos tried by shorting the pins of motor manually, but even then it keeps on rotating.

How to stop it at once

Edit: time change

[Chalcogenide]

If you use an H-bridge to provide the pwm you can reverse the supply voltage on the motor pins so that it acts as a brake. An other solution might be to switch a resistor or a zener / TVS diode between the pins so that the voltage rises and energy is dissipated faster (but watch out for the breakdown voltage of the driving mosfet/chip/whatever) - this second option has its caveats and is typically slower.

[danadak]

This might be useful -

https://e2e.ti.com/blogs_/b/motordrivecontrol/archive/2013/10/18/the-art-of-stopping-a-motor

Regards, Dana.

[Vindhyachal.takniki]

Added a small mechanical braking system, now it is working fine.