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DRV8801: Brushed DC motor with Stall detect;

Linda Igboanugo
Intellectual 1810 points
Part Number: DRV8801

Hello,

We are looking for support to recommend a BDC with the below spec's

Our requirements are:

 

Integrated H bridge

Vm = 12V

Ipk = 0.8A

 

We'll be driving the motor to close and open a shutter, we’ll be driving the motor into an end stop.

We need a way of detecting the motor has stalled; The DRV8801 has VPROPI output which is being considered. (We're expecting the current to shoot up when the motor has stalled. is this right?).

 

However can you suggest an alternative solution with stall detection ?

  

As we will be mechanically stopping the motor, is there a preferred decay mode ? (i.e. would fast decay be preferable ?)

 

 

Many thanks

Linda

  • 0
    TI__Guru 56650 points
    Linda,

    Yes. you can use the winding current to detect the stall. I get a quote from "www.avrfreaks.net/.../detecting-when-motor-stops" and hope that can help you.
    "You can use a current sense method to determine when the motor stalls.
    But you run the risk of having the motor or drive circuitry become damaged. Especially if the drive circuit can't handle the maximum stall current levels.
    But I prefer to use a couple of limit switches myself. The simplest method is a couple of micro leaf or lever switches. One switch for when the window closes the other swtich for when the window is open. You then drive the motor until one or the othr switch is closed or open (depending on your circuit).
    I myself like to use the Hall Effect sensors for this, such as those from www.allegromicro.com
    A more advanced method might even include some sort of in between position sensor so that the MCU knows the position of the window or door at all times. A simple method would be a geared down shaft turning a potentiometer (almost one full turn equals the window open or closed).
    Thus the MCU can dtermine the window position."