DRV10983-Q1: How to set input current draw to 1.5A, and 12V on DRV10983-Q1

Hey Mohammad,

I want to confirm, is the problem that, you want the DRV10983-Q1 to have an input current of 1.5A but is only consuming maximum 0.12A?

You can set max current the DRV10983-Q1 will consume before a lock happens, but you cannot set the DRV10983-Q1 to directly consume a set number of Amps. You can only set the speedcmd of the motor, which will correspond to a set number of Amps depending on the motor load.

Is the core of your problem that the motor isn't spinning as fast as you want it to?

If so then do the following:

1) set speed cmd to value of 511 for 100% speed cmd.

2) Increase the Vcc voltage to allow more current to drive the motor

3) Tune the motor driver using the DRV10983-Q1 tuning guide (http://www.ti.com/lit/ug/slvuav9/slvuav9.pdf

Hi Sanmesh,
My apologies for any confusion. I was looking to setup a demonstration with our 20W motor, to 1.5A Input current with our power supply voltage set to 12V. Sorry the 0.12A was the output current being measured for one of the phases. For our work we would like to see the input current at 1.5A to 2A at 12V under load conditions.

The input current I was measuring was 0.5 to 0.6A without any load, with our motor, under closed loop conditions. When resistance was applied to the motor( i.e. externally thru holding the physically holding the motor) the input current went up to 0.9A for a brief moment.

I am not able to see how the 1.5A to 2A continuous winding current (i.e. Input current) can be achieved at 12V, with this motor, as is suggested in the DRV10983-Q1 documentation (with the motor stopping due to the load). The application is a water pump.

Please note, I have already applied the setting mentioned in your previous comment. Please advise as to what else maybe tried to raise the input current within the GUI or through the power supply.

Thank you

1) I want to understand why you are trying to reach a certain current consumption instead of a certain speed. You just want to prove the design can handle 12W? Usually the less current consumed to reach your water pump application, the better it is, and if you are able to test the motor in your water pump application and the motor achieves the task with less than 1.5A, that's all you need.

2) The Max current I believe can be consumed is limited by the phase to phase resistance of the motor. What is your phase to phase resistance of the motor? I think the max average current is Vcc/(phase to phase motor resistance)/root(2), but let me check.

3) If you already tuned the driver, set 100% speed cmd, and increased the voltage, you can't increase current consumption through the GUI or DRV10983. You have to increase current consumption by putting external load torque on the motor somehow, through a dynamometer, by putting a heavy fan blade on the motor, or some other heavy thing to put external load torque on the motor 

Thank you for your reply.

1) That is correct. We are concerned with the flow rates of the water pump in operation. Perhaps at lower current similar flow rates maybe achieved. Our mechanical group will verify this. I will find out and get back.

2) 1.3 Ohms. Ok sounds good.

3) Will see what we can do from our end.

I also wanted to ask if it is possible to obtain a SPICE model that I can use for simulation in PADs AMS. If TI can provide this it would be very helpful.