Any updates here? Thank you.
Any updates here? Thank you.
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
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.
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
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
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、VCP是否会引起1脚被拉低?
1. Will VCP cause one foot to be pulled down?
2、VCP正常值大概在什么范围?
2. What is the normal value of VCP?
3、什么情况下会引起芯片内部的change pump不正常被拉低?
3. Under what circumstances will the change pump inside the chip be abnormally pulled down?
4、还有什么可能会造成我们目前的问题?
4. What else may cause our current problems?
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
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.
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