Other Parts Discussed in Thread: MCT8316A
MCT8316AEVMを確認させてください。
GUI上の手順に従って動かそうとしたのですが、エラー表示はないのにモーターが駆動しない現象が発生しました。
Question(MCT8316AEVM) 20240510.xlsx
詳細は添付のExcelに記載しておりますのでご確認ください。
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MCT8316AEVMを確認させてください。
GUI上の手順に従って動かそうとしたのですが、エラー表示はないのにモーターが駆動しない現象が発生しました。
Question(MCT8316AEVM) 20240510.xlsx
詳細は添付のExcelに記載しておりますのでご確認ください。
Hi Kyohei,
Can you verify that AVDD is ~3.3V?
Can you also enable "Auto Read Fault Status" and "Auto Read Motor Status" when trying to spin the motor?
Please tell me what the Algorithm State is when attempting to spin the motor.
Regards,
Joshua
Hi Joshua
I have written the contents of the answer in Excel, so please check it.
3225.Question(MCT8316AEVM) 20240513.xlsx
2475.regs(MCT8316AEVM 20240513-1).zip
Regards,
Shibuya
Hi Joshua
When I reviewed the settings with reference to the contents of the following page, I was able to confirm that the brake was released and the motor was driven.
We plan to confirm the detailed operation details from now on, but once the problem has been resolved, we will contact you.
e2e.ti.com/.../mct8316aevm-device-not-work-after-write-register-value-to-eeprom
Regards,
Shibuya
Let me review the closed-loop control of the MCT8316AEMV.
If the target electric angular rotation speed is less than 1.3 kHz, the rotation speed control is working correctly, but when the target value is 1.3 kHz or more, the rotation speed is not followed.
・When I checked the drive voltage, it was not 100% duty, so it seems that the upper limit of motor power does not have an effect.
・When the voltage is lowered, the drive voltage is 100% duty, so the upper limit duty limit seems to be irrelevant.
・When the electric angular frequency is 1.3 kHz or more, the duty of the drive voltage is not uniform.
We will attach a confirmation waveform, so please check it.
Question(MCT8316AEVM) 20240514.xlsx
regs(20240513-2).zip
Regards,
Shibuya
Hi Shibuya,
Please allow me some time to review the information you provided. I will aim to provide a response by Wednesday.
Regards,
Joshua
Hi Joshua
Thank you.
I would also like to ask about the lead angle setting,etc, so please confirm.
(I added it to Excel below)
0572.Question(MCT8316AEVM) 20240514.xlsx
regs (20240514-2).zip
Hello Kyohei,
Please try the following below to get the speed of the motor to match the target motor speed:
For the questions in section "Behavior of different drive voltage shapes for each phase", please check if the suggestions above help address the issue.
For the FG output, FG is based on the driving frequency. With FG_DIV_FACTOR set to divide by 1 (1b) the FG should rise when one of the phase voltages is high and fall when the phase voltage goes low. Please see figure 8-45 for a visual:
For the lead angle, we recently discovered that the slider in the All Tuning Settings page is not updating the LD_ANGLE register. Please try adjusting the register manually in the register page of the GUI. LD_ANGLE is located in CLOSED_LOOP1.
Regards,
Joshua
Hi Joshua
Thank you for your answer.
I would like to check the behavior of the contents of the contact.
>>For the FG output, FG is based on the driving frequency.
>>With FG_DIV_FACTOR set to divide by 1 (1b) the FG should rise when one of the phase voltages is high and fall when the phase voltage goes low.
>>Please see figure 8-45 for a visual:
⇒It says "one of the phase voltages is high", but is it random to refer to the voltage of which phase(A or B or C)?
Or is the phase you refer to always be phase A?
Regards
Shibuya Kyohei
Hi Shibuya,
I will need to reach out to our systems team to check on this. I will aim to get back with you by 5/22.
Regards,
Joshua
Hi Shibuya,
I am still waiting for a response from our systems team. I will aim to provide you an update by 5/29 at the latest.
Hello Kyohei,
The FG toggling mechanism depends on if the motor is actively being driven or coasting.
When the motor is being actively driven, the FW will make the FG toggle once every commutation point. Active driving states include states like align, open loop, and closed loop.
When the motor is coasting, say Hi-Z, Brake, or ISD, the FG is toggles when a zero crossing point is detected. The zero crossings are determined by the BEMF comparator inside of the MCT8316A.
Regards,
Joshua