Quantcast
Channel: Motor drivers forum - Recent Threads
Viewing all 13585 articles
Browse latest View live
↧

DRV10866EVM: Start-up sequence intermittent with high inertia

June 12, 2019, 1:06 pm
$
0
0

Part Number:DRV10866EVM

Hi,

I am using the DRV10866 in a closed loop application. The current limit resistor is the default 3.8k. With a light inertia the motor starts up quickly and robustly. With a higher inertia motor it mostly does not start unless I give a spin by hand. Left untouched it goes through several attempts at starting up but I don't see the Fg pin toggle. It stays high. 

This motor has low resistance (1 ohm phase-phase) so I added 6 ohms phase-to-phase to limit start current. Is this needed or should I just rely on the DRV10866 current control? Would this additional resistance be detrimental to the start-up bemf detection? The use case is the motor will be started and lock within about a couple seconds but then stay on for literally hours. 

How small can I make the current sense resistor? There appears to be a region where if the acceleration is too slow the bemf can't be detected. Any advice on how to proceed. FYI, the nominal run speed is 3600 RPM with Vcc=5.0V.

Thanks,

Brian

↧
Search

DRV8823: Linux driver code for drv8823

June 12, 2019, 7:35 pm
$
0
0

Part Number:DRV8823

Hi team,

My customer is interesting on our motor drive DRV8823  and is asking for the linux driver code for it.

The linux version is 4.1.17. Could you kindly supply it? Or is there any other suggestion for it ? Thanks.

Regards,

↧
↧

DRV2603: ESD protection for outputs.

June 12, 2019, 10:39 pm
$
0
0

Part Number:DRV2603

Do you have a recommended part to use with the drv2603 +-outputs for ESD protection. The outputs are connected to an external ERM motor so will potentially exposed to ESD from outside the device case. This design will have a minimum of two DRV2603's so quad line protection would also be nice. Thanks.

↧

DRV2605L: details about audio to vibration function in DRV2605

June 13, 2019, 12:58 am
$
0
0

Part Number:DRV2605L

  1. (Please visit the site to view this file) Can you provides details about audio to vibration function?

 

So far as I know, the DRV2605 has two modes. One is the open-loop driving through the use of internally-generated PWM. The other is the audio to vibe mode which convert an audio input signal to meaningful tactile effects.

 

The haptic feedback system theory is the codec process audio data to an continuous analog audio signal and then send to the IN/TRIG pin of haptic driver. What’s next?

 

The analog audio signal goes in the haptic driver. First there is a pre amplifier to amplify the audio signal. Then a pwm modulator to transform the analog audio signal to a digital PWM signal. The information of analog audio signal is stored in the duty cycle of PWM signal.

As the differential output amplitude of the haptic driver is Vout_diff=Vmax*(2D-1), thus the tone of analog audio signal is transformed into different Vout_diff which result in different vibration strength. Am I right?

 

Note: D is the duty cycle of PWM signal.

 

 

 

 

 

↧

DRV8702D-Q1: DRV8702D-Q1

June 13, 2019, 1:08 am
$
0
0

Part Number:DRV8702D-Q1

Hi dear,

I came across with a problem about DRV8702D-Q1.

when I dive the load with 2.4s cycle PWM with one Peltier load, the wave about the SH1 and SL2 as shown in the following photos, and the waves for GH1 and GH2 are the similar. 

The load is one Peltier, I think it is different with the motor. 

I tried to change the frequency of the PWM, but it seems no effect, please help.

Thanks.

↧
↧

DRV8870: DRV8870 OCP question

June 13, 2019, 1:28 am
$
0
0

Part Number:DRV8870

Dear experts,

My customer is testing OCP function of DRV8870. They applied PWM signal to IN1 and set IN2 to high, when short OUT1 to OUT2 they find OUT1 and OUT2 remain high. It's strange because it seems that high side FETs are conducted but all FETs should be disabled based on datasheet. And it didn't resume or repeat fault cycle. Could you help to explain the question, or maybe it triggered another protection?

CH2:current of OUT1 terminal; CH3:OUT1; CH4: OUT2. CH4:OUT2

↧

DRV8304: POWER SUPPLY

June 13, 2019, 3:01 am
$
0
0

Part Number:DRV8304

I'm using the drv8304 to drive a three phase bridge at 48Vdc and the driver is connected to 24Vdc. are there any issues using 2 different supply voltages?

↧

high level closed-loop PMSM control with microcontroller

June 13, 2019, 5:15 am
$
0
0

Hi,
I have a PMSM that i can drive it by an existing motor driver with pulse-direction method, so i can drive the driver by pulse and then the driver runs motor. I have a closed-loop system with motor encoder and mentioned driver and thus my current/torque loop is closed in the driver/motor level. My requirement is using a secondary higher level encoder for closing loop with my controller that generates required pulses for the driver. Is Delfino ecosystem a proper selection for this implementation? Is there any suitable library for fast and secure implementation of this closed-loop? On the other hand, i need a MCU for controlling a drive/motor subsystem by an external encoder feedback and generating required pulse/direction signals that causes a smooth run/stop motion profile.

BR
mhmontazeri

↧
Search

Implementation of a multi-axismotion control system

June 13, 2019, 5:36 am
$
0
0

Hi,

My goal in my new project is implementation of a multi-axis control system with a PMSM. The control loop must have the circular/linear interpolation capability. Can anyone propose me a suitable TI microcontroller for this purpose that can serve the control loop update speed and smooth motion control profile simultaneously?

BR

mhmontazeri

↧
↧

DRV8353RS-EVM: Unable to adjust IDRIVE

June 13, 2019, 6:55 am
$
0
0

Part Number:DRV8353RS-EVM

Hi Team,

DRV8353RS-EVM and the GUI is used to control motor, but when the GUI connects with DRV8350RS-EVM successfully and "System Enable" is enabled, we cannot change the IDRIVE, even another current option such as 1000mA for IDRVEP_LS[7:4] is choosed and then write register is clicked, the current cannot be changed.

My question are:

1. Why IDRIVE cannot be changed? Is it possible that the C2000 code set the IDRIVE fixed? 

2. When we "Lock all registers", why other registers can be set? It doesn't match the datasheet...

Could you please help answer the two questions, thanks!

Best Regards!

Hao

↧

DRV8308: Brushless drill motor driver schematic review

June 13, 2019, 7:36 am
$
0
0

Part Number:DRV8308

(Please visit the site to view this file)

Hello,

I made a few of these boards to drive a brushless drill motor, and would like a review of the schematic. I am currently driving the board with jumpers from the DRV8308evm kit.

Thanks

↧

DRV103: 22µF Tantalum Capacitor Burned Out

June 13, 2019, 12:29 pm
$
0
0

Part Number:DRV103

So I have completed a prototype circuit using the DRV103, and I'm using it to drive a solenoid. The circuit diagram is shown on the lower half of page 13 of the DRV103 datasheet.

When testing the circuit at 18VDC and about 1.6-1.8A, with 25kHz frequency and 50% duty cycle, the 22µF Tantalum capacitor (rated for 50V) burned out.

I believe the capacitor was connected correctly(Long leg to positive), since testing at 0.5A and at 3.0A (Duty cycle at 100%) with separate solenoids worked.

So I'm interested in finding the cause and learning what not to do in the future.

Thank you,

Alistair

↧

DRV2605L: Specifications for LRA Load

June 14, 2019, 5:19 am
$
0
0

Part Number:DRV2605L

Hi,

Could you please tell me the recommended reactance range for LRA if DRV2605L is used with LRA load ?
In addition, please tell me the LRA which can be used by DRV2605L.

Best regards,
Kato

↧
↧

Controller for small proportional solenoid valves

June 14, 2019, 6:51 am
$
0
0

I'm not sure this is the best forum for this question so feel free to re-locate my inquiry.

I want to control small proportional solenoid valves (<2W, max drive current <200mA)  as finely and precisely as possible preferably via I2C (or SPI or UART). I would like to be able to add some dither, too.
So I guess I will need a (>12bit) PWM source, a MOSFET, a compensated current measuring component (like INA251?) and (an ADC that creates) a feedback to the PWM source.

I could build this up and program a microcontroller to act as an I2C-controllable PWM source with an internal or external ADC and a current sense amplifier (e.g.) INA253. Is there a simpler, more integrated solution?

TIA,

Beat

↧

DRV8701: DRV8701 IDRIVE and Gate drive current for Parallel mosfet CSD18510Q5B

June 14, 2019, 11:46 am
$
0
0

Part Number:DRV8701

Hi,

I am using DRV8701  as GATE driver for H bridge using mosfet CSD18510Q5B. Everything working fine when i am using 3 parallel mosfet in H bridge(i.e total 12 mosfet in H bridge ) with setting 150ma source gate current of DRV8701.When i am using 4 parallel mosfet(i.e total 16 Mosfet in H bridge) to increase current capacity then  h bridge not working but when i removing one mosfet from each side of H bridge then it is working fine.

According to datasheet of Drv8701,

IDRIVE=Qgd/Rt

For CSD18510Q5B,   Qgd=21nc and Rise time Rt=17nS

Idrive for single mosfet=21/17=1.23mA ,

Idrive for 4 parallel mosfet is =4x1.23mA=4.92mA 

But still it is not driving 4 parallel mosfet in Each side of H bridge.

↧
Search

DRV8301: Over Current Protection and Over current Shunt calculation

June 14, 2019, 2:42 pm
$
0
0

Part Number:DRV8301

Hello friends!

I have a question about the calculation about the Over Current Protection and Over current Shunt level.

Based on the datasheet of DRV8301,

Vo = Vref/2 - G(SNx - SPx).

If I put the all of the SN1, SP1, SN2, SP2 as Z(high-impedance, then what is the fomular of the Over current threshold level?

Is this relative with Overcurrent Trip configuration?

This is parameters of my application.

--------------------------------------------

SP1 : Z

SN1 : Z

SP2 : Z

SN2 : Z

Vref : 3V

G(Gain of amplifier 20V/V)

OC_ADJ_SET : 24(1.043V)

MOSFET Rds(on) : 9.8m ohm

-----------------------------------------------------

Could you give me the detail explanation include theory?

Thank you!!

↧

DRV8834: Parameter check on tri-state inputs pins

June 14, 2019, 5:09 pm
$
0
0

Part Number:DRV8834

Hi, Team

Please help to check and provide parameters. We have table as below for DRV8846. But it's missing in DRV8834 datasheet.

↧
↧

What The Shunt Resistors Used in The DRV8711 do?

June 14, 2019, 7:42 pm
$
0
0

Part Number:BOOST-DRV8711

Greatings, 

I wanted to take the current measurement from both shunt resistors in the DRV8711 Booster , but it seems that the booster isn't allowing that.

i asked previous Question here whether the DRV8711-BOOST Uses those shunt resistors to make a FEEDBACK Current loop, but the answer was no.

So What is the Application of the Two Sens Resistor on Board.

↧

DRV8800: Pin8, Current detection problem.

June 15, 2019, 1:32 am
$
0
0

Part Number:DRV8800

Hi all,

When using the DRV8800 as a motor driver, can the 8th pin(SENSE) be used as a monitoring point for the voltage when driving the motor ?  For example, the power supply voltage is 12 V, motor driver current is 50mA , Rsense is 0.5Ω , at this point , the voltage I detected on the 8th pin should be (0.5Ω*0.05A=0.025V)？What is the current flowing through the resistor ? 50mA？(I want to use a single chip microcomputer as a device for detecting voltage , but I am afraid that the current on this pin is too large.)

I don't know if this is feasible ,  or demage other components due to excessive current.

BestRegards.

↧

DRV8702D-Q1: DRV8702D-Q1 setting question

June 15, 2019, 8:34 am
$
0
0

Part Number:DRV8702D-Q1

Dear support team

I suggest DRV8702D-Q1 to my customer,and I have some question.

Please give advice about it. 

(1)My customer want to separate the GND on the control side and the load side for motor noise,
But can they use DRV8702D-Q1 for the IC and FET+motor GND separately?
If so, how much does it affect the accuracy of current detection?

(2)Their usage is to put a 100% ON pulse into the DC motor without current regulation,
in that case, the control signal is the H and L signals instead of the PWM signal?

(3)If they do not use the nFAULT, Sense Output,
I think VREF, and nSLEEP pins are set below. Is this correct?

nFault:open
Sense output:open
VREF:pull up
nSLEEP:pull up

◆Spec
・Load：DC motor of Wiper
・Vin:12V
・Motor current:40A
・Current reguration is not need
・OCP protection need
・They want simple interface

Regards

Tomohiro Nagasawa

↧
Viewing all 13585 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>