Hi Jitendra,
Any updates here? Thank you.
Any updates here? Thank you.
↧
RE: DRV8850: DRV8850: VPROPI left open, any issue?
↧
DRV8850: DRV8850: VPROPI left open, any issue?
Part Number: DRV8850
I am trying to sample VPROPI pin on DRV8850 Evaluation board but there is a lot of noise on the pin along with the signal.
How do I remove that noise? I will be using ADC to sample the VPROPI pin.
I am using CC3220 to drive the motor.
Attaching oscilloscope capture of VROPI pin.
↧
↧
RE: DRV8702-Q1: Negative sense current
Hi Federico,
I am looking into this point and I will get back to you.
I am looking into this point and I will get back to you.
↧
RE: DRV8876: Reading the current via IPROPI
Gurkan,
Happy to know the issue is fixed.
C9 is a noise filter. A higher value can cause an extra delay for V_IPROPI detection. If the signal doesn't have too much noise, we don't need it.
Please check your system, what is the acceptable noise level and Cipropi?
Happy to know the issue is fixed.
C9 is a noise filter. A higher value can cause an extra delay for V_IPROPI detection. If the signal doesn't have too much noise, we don't need it.
Please check your system, what is the acceptable noise level and Cipropi?
↧
DRV8876: Reading the current via IPROPI
Part Number: DRV8876
Hello,
I'm trying to read the current via DRV8876 for my micromotor which is Pololu #1096 (https://www.pololu.com/product/1096)
My setup is as;
Vm = 6V
Vref = 3V
Itrip = 300mA
Ripropi = 10k Ohm
If I'm not mistaken, the measured current for my motor should be 1/10th of the voltage at IPROPI pin. If I'm reading 600mV, my motor should be consuming 60mA, is that right?
But when there is no-load I read 19mA with my multimeter which is connected just before the motor, and I read 600mV on my oscilloscope from IPROPI pin.
When there is load on; multimeter 100mA, on oscilloscope 1300mV
multimeter 200mA, on oscilloscope 2300mV
when I stalled the motor; multimeter 265mA, on oscilloscope 3000mV.
On datasheet the mirror scaling error shows as;
Under 0.15A->7.5mA
0.15A to 0.5A -> %5
The numbers look a little bit off for the error scaling, is that normal for the low current.
Is there anyway to make it more precise for my setup?
Thanks.
Gurkan
↧
↧
RE: DRV8803: connecting tho inputs and two outputs parallel
Dukel,
I think you can do the paralleling output as you said. Do you have an EVM? Please verify your solution on an EVM before doing your project.
I think you can do the paralleling output as you said. Do you have an EVM? Please verify your solution on an EVM before doing your project.
↧
DRV8803: connecting tho inputs and two outputs parallel
Part Number: DRV8803
Hi,
Would it be possible to connect two inputs like IN1 and IN3 in parallel and to the same with the outputs Out1 and Out3 to increase the current capacity?
I was thinking of connecting IN1-IN3 and Out1-Out3
and also connecting IN2-IN4 and Out2-Out4
For an application I would need 1[A], so I was hoping to solve this by connecting it in parallel.
↧
RE: DRV10970EVM: Geting higher current/torque
Hey Gabrial,
I think the problems of improper startup and not a lot of current applied lies in improper configuration of the halls.
1) Please confirm that this is the correct datasheet for your part.
www.farnell.com/.../1996060.pdf
2) Can you try putting H2 = U_HP, H3 = V_HP, H1 = W_HP, with FR = 1, and using trap commutation? This is to match the driving state in the motor datasheet to the driving state in Table 1 of the DRV10970 datasheet.
3) Are you driving the motor in sinusoidal mode or trap mode (CMTMOD pin config)? also please tell me your other configurations, like DAA
4) make sure current isn't being limited too low by the CS pin
Sincerely.
sanmesh U.
I think the problems of improper startup and not a lot of current applied lies in improper configuration of the halls.
1) Please confirm that this is the correct datasheet for your part.
www.farnell.com/.../1996060.pdf
2) Can you try putting H2 = U_HP, H3 = V_HP, H1 = W_HP, with FR = 1, and using trap commutation? This is to match the driving state in the motor datasheet to the driving state in Table 1 of the DRV10970 datasheet.
3) Are you driving the motor in sinusoidal mode or trap mode (CMTMOD pin config)? also please tell me your other configurations, like DAA
4) make sure current isn't being limited too low by the CS pin
Sincerely.
sanmesh U.
↧
DRV10970EVM: Geting higher current/torque
Part Number: DRV10970EVM
Hello,
I have an DRV109070EVM Evaluation Module here to drive an DF45M024053-A2 Brushless Motor from Nanotec.
The motors main datas are: rated valtage: 24V, rated current: 2,36A, phase to phase resistance: 0.8 ohms, torque constant: 0.0335 Nm/A.
I connected it like discriped in the user guide, with 15V supply voltage.
Internal voltage of the Evaluation Module just starts with lower volage (as descriped in another post) then the board works.
But it is not able to start the unloaded motor. The motor needs to be turned manually to get ist started. And when it is running the current is never more than 0.3A even when the motor is breaked manually the current goes down to 0.1A and therefore torque is minimal. According to the datasheet 1A should be possible but how can i reach that current under load?
Is it possible to get the start problems fixed and a higher torque?
Or can someone suggest a Tree-Phase Brushless DC Motor Driver which is able to generate high torque even at low speed.
Thank you for your answers!
Regards
Gabriel
↧
↧
RE: DRV8702-Q1: Negative sense current
Hi Federico,
The current regulation circuitry is not designed for negative voltage short circuit detection. If you look at the absolute maximum of SP (-0.5V) and SN (-0.3V), you will notice that any value below -0.2V in SP-SN can result in device damage.
We can review your schematic and understand what you are trying to achieve with y our sense resistor being placed in parallel to the bulk cap to suggest a better way to regulate your current.
Let me know if you wish to have a schematic review.
The current regulation circuitry is not designed for negative voltage short circuit detection. If you look at the absolute maximum of SP (-0.5V) and SN (-0.3V), you will notice that any value below -0.2V in SP-SN can result in device damage.
We can review your schematic and understand what you are trying to achieve with y our sense resistor being placed in parallel to the bulk cap to suggest a better way to regulate your current.
Let me know if you wish to have a schematic review.
↧
RE: DRV10983: DRV10983EVM GUI interfacing with DRV10983
We don't have an easy straightforward alternative to using the GUI withouth the USB2any.
1) If you just want to see the current tuning settings of the DRV10983 in the GUI, and not the real-time values to read like measured speed, I'd enter the GUI in demo mode, and then use the "script" tab to write the eeprom register settings in python code like below:
GUI=GUI_Module.Device_GUI("DRV109xx EVM.exe")
GUI.write_register("DRV10987","EEPROM Programming5",0x0)
GUI.write_register("DRV10987","CONFIG4",0x1000)
Then you'd see your settings in the GUI with their actual values.
2) you can look in the DRV109xx EVM installation folder to see if you find anything that can help you use the GUI without USB2Any
3) you can decide to not use the GUI and just do the I2C writes manually with a microcontroller or other instrument
1) If you just want to see the current tuning settings of the DRV10983 in the GUI, and not the real-time values to read like measured speed, I'd enter the GUI in demo mode, and then use the "script" tab to write the eeprom register settings in python code like below:
GUI=GUI_Module.Device_GUI("DRV109xx EVM.exe")
GUI.write_register("DRV10987","EEPROM Programming5",0x0)
GUI.write_register("DRV10987","CONFIG4",0x1000)
Then you'd see your settings in the GUI with their actual values.
2) you can look in the DRV109xx EVM installation folder to see if you find anything that can help you use the GUI without USB2Any
3) you can decide to not use the GUI and just do the I2C writes manually with a microcontroller or other instrument
↧
DRV10983: DRV10983EVM GUI interfacing with DRV10983
Part Number: DRV10983
Hello,
I want to know what is the junction between DRV10983 EVM GUI and SCL/SDA Pins of DRV10983
Regards,
Shariq Hussain
↧
RE: DRV10983: Issues with DRV10983 Output for A2212/13T 1000KV BLDC motor
Let me get back tomorrow on following up on your other questions.
Just some quick notes below.
register 0x10 is status register so vaue of 0x00 is good, meaning no faults.
Register 0x12 is MotorSpeed2 register. Speed in Hz is (MotorSpeed1:MotorSpeed2)/10. So if MotorSpeed1 = 0x01, and MotorSpeed2 = 0xFF, then speed in Hz is 0x01FF / 10 = 51Hz
Just some quick notes below.
register 0x10 is status register so vaue of 0x00 is good, meaning no faults.
Register 0x12 is MotorSpeed2 register. Speed in Hz is (MotorSpeed1:MotorSpeed2)/10. So if MotorSpeed1 = 0x01, and MotorSpeed2 = 0xFF, then speed in Hz is 0x01FF / 10 = 51Hz
↧
↧
RE: DRV8801: PIN 1 error
nSLEEP 3.48V ，I still can't find out what the problem is.
↧
DRV8801: PIN 1 error
Part Number: DRV8801
Without motor connection, as long as DRV8801 is enabled, one foot nFAULT will be pulled down. We exclude overcurrent, short circuit and low voltage. Is it caused by VCP voltage?
1. Will VCP cause one foot to be pulled down?
2. What is the normal value of VCP?
3. Under what circumstances will the change pump inside the chip be abnormally pulled down?
4. What else may cause our current problems?
↧
DRV10987: SPEED-Analog Mode
Part Number: DRV10987
Dear, Sir.
My customer will start the design to apply DRV10987 for their system.
In advance, they would like to make sure following topics.
Please give your advice.
1. Full-speed voltage & Zero-speed Volatge.
It will be defined on the datasheet, 0.1V to 0.9* 3.3v.
I am not sure the real resolution of internal ADC, but I wonder the
lower reading values & higher reading values would be conveted to Full & Zero?
2. Resolution.
It will be defined, typ. 6.5mV.
I wonder the resolution will be reflected the error like INL, DNL?
If you know like ENOB, Please advice me.
Best Regards,
H. Sakai
↧
RE: DRV10983: Issues with DRV10983 Output for A2212/13T 1000KV BLDC motor
sir,
still motor is not running well means very slow speed, Register 0x10 is status register and i got 0x0F, means no fault. In register 0x11 i got 0x00 and in register 0x12 i got 0x0A-0x0B. So, speed is 0x000A/10 = 1Hz. But I wrote in register 0x00 = 0xff and in register 0x01 = 0x81 means full speed written via I2C. And also check my previous reply carefully in which i gave answers for your possible issues.
Actually we are going to make our own BLDC Ceiling Fan . We saw your TIDA 00386 solution regarding to BLDC ceiling FAN, also see on youtube BLDC ceiling fan solution on TI Platform i.e., www.youtube.com/watch. First step is motor functioning. Recently we use A2212 drone Motor to clear concept of BLDC functioning by DRV10983. If we got success in this case then we have to move on fan's motor.
Regards,
Shariq Hussain
still motor is not running well means very slow speed, Register 0x10 is status register and i got 0x0F, means no fault. In register 0x11 i got 0x00 and in register 0x12 i got 0x0A-0x0B. So, speed is 0x000A/10 = 1Hz. But I wrote in register 0x00 = 0xff and in register 0x01 = 0x81 means full speed written via I2C. And also check my previous reply carefully in which i gave answers for your possible issues.
Actually we are going to make our own BLDC Ceiling Fan . We saw your TIDA 00386 solution regarding to BLDC ceiling FAN, also see on youtube BLDC ceiling fan solution on TI Platform i.e., www.youtube.com/watch. First step is motor functioning. Recently we use A2212 drone Motor to clear concept of BLDC functioning by DRV10983. If we got success in this case then we have to move on fan's motor.
Regards,
Shariq Hussain
↧
↧
DRV10983: Issues with DRV10983 Output for A2212/13T 1000KV BLDC motor
Part Number: DRV10983
Hello,
I'm using A2212/13T 1000KV BLDC motor i.e., used in drone. By using external microcontroller i wrote 12 registers (0x20 - 0x2B) of DRV1093 via I2C regarding to motor parameters. And on register 0x00 & 0x01 i wrote 0XFF for full speed, it also included overRide Bit so that speed command through I2C.
measured phase Resistance is 0.155 ohm (according to table value for Register 0x20 is 0x18)
I measured Motor Velocity Constant ≈ VCC / maximum motor speed (no load)
My example: motor spins with 12000 rpm as its rating is 1000 RPM/Volt, so my volt is 12V that's why 12000 RPM. 12 poles and 12V power supply:
12000 rpm / 60 / (6 pole pairs) = 1200 Hz
BEMF constant Kt = 12 V / 1200 Hz =>10 mv/Hz (according to table value for Register 0x21 is 0x0B)
Rest Registers
#define REG_22 0x3A
#define REG_23 0x00
#define REG_24 0x50
#define REG_25 0xDA
#define REG_26 0x8B
#define REG_27 0x10
#define REG_28 0x27
#define REG_29 0x3A // DeadBand 400 nsec
#define REG_2A 0x04 // Buck Regulator output 3.3V
#define REG_2B 0x0C
But motor spins in unmannered behaviour sometime run and sometime stop because DRV10983 output generate with only 3% duty and it comes after every 4 sec and rest time it off.
So please help me regarding to values of these registers. And it's valuable response if support is regarding to A2212/13T 1000KV BLDC motor's parameters.
↧
RE: DRV8702-Q1: Negative sense current
Hi,
The schematic is pretty much the same as the evaluation board. Here is an image:
Regards,
Federico
↧
DRV8702-Q1: Negative sense current
Part Number: DRV8702-Q1
Hi,
I have a DRV8702 driving a full H-bridge via independent PWM. I want to use the sense resistor as a means to detect a short circuit. However, as the H--bridge and the resistor are in parallel to the bulk capacitor, the current seen by the resistor can be negative also (my load is pretty inductive).
From the datasheet I'm not certain what's the behaviour of the driver in such case. What happens when Vsp is negative? The tripping circuit acts also? It trips when Vsp< -1 V?
Thanks,
Federico
↧
