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Hello,

I'm having a hard time controlling RPM.

I set the RPM to 2000 RPM when I set it.

However, there is a symptom that the RPM does not exceed 1000 and continues to go down.

I've modified several parameters for this symptom, but it never improved.

If you are aware of this problem, please reply.

Solved! Go to Solution.

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Hello @JasonLEE

The issue in this case is not related to shunt configuration. The load on the motor was too high such that the current drawn was exceeding the 5A limit that was set within the MCE Wizard. Increasing the current limit in software was able to solve this issue.

Regards

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Hi：

Would you share that what time your motor can't run to high speed and your design? The output is open load or...?

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What kind of load of IM818 and 828 board?

Did you have and share there motor drive current waveform by MCEWizard?

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How should I measure the motor load?

I've got an impeller.

Is there a waveform in MCEWizard?

If I have a waveform, which waveform should I share?

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As there waveform are from soft "read", you can dubg your setup(MCEWizard) with system.

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Hi:

Would you share the project detailed information?

From your comments, we get out you testng IM818 and IM828 board. But there are power boards and they can do most function. we don't know that about what's your project and you want.

For waveform, you can gat out MCEDesigner:

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Hi,

IM828XCC Single Shunt's no-load waveform.

I set it to 250 RPM.

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IM828XCC Leg Shunt's no-load waveform.

I set it to 250 RPM.

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What's kind of your board?

EVAL-M1-IM828-A is single shunt solution.

EVAL-M1-IM818-A is leg shunt solution.

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Hi, @喜马拉雅之雪

1. I have both EVAL boards.

EVAL-M1-IM828-A is single shunt solution.

EVAL-M1-IM818-A is leg shunt solution.

2. We also have two customized boards with the same design.

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For IM818-A board, as motor poles setup is 20, so the drive target is 333Hz.

Would you try different setup with No.58/60/94 question?

My forvert is:

Fiux estimator time constant: 3~7msec,

Gatekill filter time constant:1uS.

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Hi, @喜马拉雅之雪

My motor pole is 10P.

20P is set incorrectly.

Can you provide a solution based on 10P?

Q58) What value should I set for this part?

I need a maximum of 2500 RPM.

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Happy new year

1) Would you please best setup there question.

2) 3~7mS can meet 10P application.

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Hi @喜马拉雅之雪

In case of Q58, I didn't know how, so I left it there

The rest were set up as you provided the solution, but the problem did not improve.

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1) What's your power input? AC380V or ...

2) Could you test the motor KV value?

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1) AC 3 Phase 380V.

2) Could you tell me how to measure the motor KV value?

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Have you a digital oscilloscope？

If OK， OSC probe connect to motor pin: U-V.

Rotating the motor at a constant speed, test U-V pin voltage waveform by OSC. Intercept the waveform and upload.

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Hi.

Two methods were measured using an oscilloscope.

1) U, V phase is measured in detail with an oscilloscope.

RPM is 200.

This is rotated by the motor driver.

2) U phase was measured in Oscilloscope.

This part rotates consistently by hand.

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Could you zoon in the waveform for read the voltage and frequency?

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The motor is Y connect? The waveform is U to three-phase midpoin?

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The motor connection is a Y connection.

The waveform is a U-V connection.

Put a scope on the U

I have connected a GND to V.

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Would you please double check the DC BUS voltage? From your waveform, it is DC290V.

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안녕,

다시 측정했습니다.

확인해주십시오.

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Would you please check your test system. The waveform is different of standard.

This is typical of the switching waveform of EVAL-M1-IM818/828-A @AC380V 3-phase input:

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? DC270V?

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This is DC 600V.

Not 270~300.

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Could you tell me where and how you checked the waveform? I will check the same way.

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If BUS is DC600V, the waveform is not right.

Could you made the testing picture/photo (include probe and OSC )?

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Thanks for your testing and waveform. The motor is Ke=132.7V/krpm.

The motor Vp-p@2000rpk=265V*2*1.414=375V

DC BUS: Vbus=Vp-p/((T-2td)/T)=399V

So if DC BUS is high than DC400V, the motor can go to 2000rpm.

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테스트한 보드는 EVAL 보드가 아닌 맞춤형 보드입니다.

그러나 디자인은 EVAL 보드와 같습니다.

범위는 U, V, W 섹션에서 측정되었습니다.

잘못된 사항이 있으면 알려주세요.

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The motor is Ke=132.7V/krpm.

The motor Vp-p@2000rpk=265V*2*1.414=375V

DC BUS: Vbus=Vp-p/((T-2td)/T)=399V

So if DC BUS is high than DC400V, the motor can go to 2000rpm.

I don't know if this value is correct.

The motor's symptoms have not improved at all.

It's the same.

RPM does not go up.

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I understand that your testing. However, don't floating the ground of the probe.

I think about，this is only testing skill, it's not big problem.

Could you tall me about what's your ran of max speed?

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The maximum speed I want is 2500 RPM.

But it only goes up to 1000 RPM.

It's not going up any more.

Can't you solve this problem?

Where should the grounding of the probe be located?

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My favort is power ground(-bus) with PWM power waveform. Other testing, I like use local ground(test reference ground is nearest the test target).

For 850rpm, could you test current and PWM waveform?

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Which part are you talking about if it's local ground?

Can you explain it in more detail?

Are you talking about the Earth part?

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MCU and shunt picture...

For example, shunt wavefrom:

This is test via layout with the shunt resistance:

Probe:

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Tested as you told me and exploded.

The whole hardware exploded.

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WOW! DEEP LAMENT...

Could you share the shunt resistance part number? And shunt AMP loop SCH?