What dows "Holding Torque Tb"'s "b" mean?

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colemanlee
Posts: 4
Joined: Fri Mar 17, 2017 5:59 pm

What dows "Holding Torque Tb"'s "b" mean?

Postby colemanlee » Fri Mar 17, 2017 6:11 pm

Hello,
I know
    TH = Hold Torque;
    Tb = Hold Torque ( Semi current );
But what is the full word of "b" in "Tb"?
Orientalmotor, impressive!

om_tech_support_JS
Posts: 137
Joined: Tue May 10, 2016 4:48 pm

Re: What dows "Holding Torque Tb"'s "b" mean?

Postby om_tech_support_JS » Mon Mar 20, 2017 7:05 am

Hi colemanlee,

In regards to your question, is there a specific product which you are referring to that shows the Holding Torque as Tb? Was this reference pulled from a manual or our catalog?

colemanlee
Posts: 4
Joined: Fri Mar 17, 2017 5:59 pm

Re: What dows "Holding Torque Tb"'s "b" mean?

Postby colemanlee » Wed Mar 22, 2017 6:48 am

Here is a calculation sheet from OM company's inner calculation software, in the picture you can see "Holding Torque Tb : 1.11500 [Nm]".
Attachments
PIC_22_001.jpg
Where is the Tb come from
PIC_22_001.jpg (46.74 KiB) Viewed 523 times
Orientalmotor, impressive!

om_tech_support_JS
Posts: 137
Joined: Tue May 10, 2016 4:48 pm

Re: What dows "Holding Torque Tb"'s "b" mean?

Postby om_tech_support_JS » Wed Mar 22, 2017 9:07 am

Hi colemanlee,

The "calculation software" and attachment which you provided are not available for the OM USA branch. From the part number, PKP268D28A-L which is the Japanese version, I can verify that the Holding torque is 2.3 N-m and the Rotor Inertia is 490 x10^-7 [kg-m^2].


For the true definition of the B in Tb, you may wish to contact the branch which offered the attachment. I have provided a link below to the global support network:
http://www.orientalmotor.com/company/gl ... pport.html


However, referencing your (semi current) statement from before, I believe that the Tb is referring to the holding torque at motor standstill. This specification would have to take into consideration the driver which is being used with the motor. The recommended driver has an automatic current cutback feature which sets the current to 50% when the motor is at standstill. Therefore, at 50% current, it would make sense that the Torque would be 1/2 of 2.3 [N-m], or 1.15 [N-m].

colemanlee
Posts: 4
Joined: Fri Mar 17, 2017 5:59 pm

Re: What dows "Holding Torque Tb"'s "b" mean?

Postby colemanlee » Wed Mar 29, 2017 4:57 am

thank you.
Orientalmotor, impressive!


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