How to decide PWM modulation frequency for a DC motor?

[bittware]

Hello experts,
Does there exist rule by which to decide PWM modulation frequency for a DC bush motor?
Does the requirement come from maximum motor current ripple?
I hardly found any formula applied to this situation on internet.
Apart from the rule of thumb, I need a definite and quantitative analysis.

Thank you in advance!!! :wink:

 

[alphi]

You first want to find dc motor special note.
Motor start-up frequency and....

 

[Ante]

Bittware,

Is it a PM motor or a serial motor, power, and how many poles toes it have.
What are the manufacturers specs and what kind of load is the motor pulling.

Ante :roll:

 

[bittware]

Bittware,

Is it a PM motor or a serial motor, power, and how many poles toes it have.
What are the manufacturers specs and what kind of load is the motor pulling.

Ante :roll:

Hello Ante,
Yes, it is a PM motor. Its nominal power is 11 Watt. I think it has two poles, one from its inductance and one from its inertia. Its load is about 10mNm.
Indeed it is RE-max 24(222054) coming from MAXON.
The datasheet is attached.
Thanks for your help!

 

[bittware]

You first want to find dc motor special note.
Motor start-up frequency and....

Hello aphi,
Thanks for your prompt. But what is Motor start-up frequency? How to decide it? What main factors affect it?
:roll:

 

[Ante]

bittware,

I am not sure of the application (load variations, percentage of RPM) and I’m not used to these small motors but here is a link that will give you plenty of info and the mathematics to calculate the frequency. **broken link removed**
Good Luck.

Ante :roll: