RE: Brushless motors - open loop all the way
Hi Shai, Your understanding of the basic open loop startup is correct. Prior to spinning the motor position is either detected or set to a known position. At slow speeds, you can continue to run in...
View ArticleRE: Brushless motors - open loop all the way
Thanks for your help."Running in closed loop also provides feedback such as locked rotor (no BEMF signal)." But if there's no BEMF signal and we have a sensorless configuration, how can the closed loop...
View ArticleRE: Brushless motors - open loop all the way
Hi Shai, Running in closed loop implies the BEMF or current is being monitored. When the motor is running properly, the BEMF provides a signal for commutating. The signal can be used to determine the...
View ArticleBrushless motors - open loop all the way
Hello,I know that brushless sensorless motor controllers establish initial back EMF by spinning the motor in an open loop.Once the BEMF is high enough - they power the coils accordingly to the position...
View ArticleRE: DRV 8825 EVM USB Opcode for DIR
For what its worth:The control messages are 5 bytes long. The OpCode is the first byte.The OpCode 0x03 corresponds to WRITE_GPIO in the MPS430 firmware for the DRV8825 EVM. DIR is sent as 03 10 00 00...
View ArticleDRV 8825 EVM USB Opcode for DIR
I wish to control the EVM board on a Linux system.First, is there any example code to control the board over Linux?If not, AppDeff.h in the firmware gives the opcodes, which I believe I send to the USB...
View ArticleRE: DRV10983 Programming EEPROM VCC Level requirement
Hi Arsalan, The EEPROM cannot be programmed reliably when VCC is less than 22V.
View ArticleDRV10983 Programming EEPROM VCC Level requirement
Hi,Device datasheet, page # 19, Section 6None Volatile memory 6.4 specifies that VCC level has to be 22V during programming of EEPROM. However "Recommended Operating Condition", page # 10 lists the...
View ArticleRE: DRV8823 has ability to monitor the current/charge
Hi Shai, 1) It would be best to contact the manufacturer of the solenoid to determine if the state can be determined by observing the current. 2) Yes there are other devices, but most do not have a...
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hello Ahmed Moving it to the Motor Drivers forum since almost all questions need to be answered by the DRV team Regards Amit
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hello Amit, Thank you for your help, Looking forward to hearing from the DRV team. Thank you, Ahmed Hossan
View ArticleDRV8823 has ability to monitor the current/charge
1.We would like to connect DC latch Solenoid to DRV8823 and want to monitor if the solenoid switch its state by observing the current which is flowing through the DRV8823, is it possible?If the answer...
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hi Ahmed, It is possible to use the BOOSTXL-DRV8305EVM with the TM4C123GXL. Firmware would have to be written to do so. It is possible to connect one brushed motor as you described. A brushed motor...
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hello Rick, Thank you for your answers! Actually I'm intending to use the BOOSTXL-DRV8305EVM to drive 24v 4A rated brushed motor with a maximum of 10A stall current. From the datasheets and guides of...
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hi Ahmed, The BOOSTXL-DRV8305EVM can drive the motor without problems. What is the stall current of the motor? According to the specification provided, the motor run <200mA when loaded, but does not...
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hello Rick, I meant another motor which has a rated current of 4A and a stall of 10A. That's not the motor in the link in my first post. So the BOOSTXL-DRV8305EVM is supposed to run the 10A motor...
View ArticleRE: using BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hi Ahmed,Yes, the BOOSTXL-DRV8305EVM can run a 10A motor.The DRV8305 has IDRIVE and TDRIVE, which limits the amount of current. For more information see the BLOG
View Articleusing BOOSTXL-DRV8305EVM with TM4C123GH6PM and DC motor
Hello,I want to know if these requirements are possible please:1) is it possible to use the BOOSTXL-DRV8305EVM booster-pack with the TM4C123GXL launch pad? 2) Is it possible to connect one brushed DC...
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RE: DRV8303 control register1 resets automatically after configuring it...
Hi Rick,Yes, the power pad is connected to ground. Please find the relevant schematics below:Below is the capture of nFault spikes (Yellow waveform) and the Gate drive outputs PWM_AL (Blue waveform) ....
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