brushless motor simulation

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#1 Sep 2, 2020

ichirotanaka

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Last seen: 3 years 2 months ago

Joined: 2020-09-02 03:27

brushless motor simulation

Hello everyone,

has anyone used the BLDCMTR model and customised it to own motor spec?

I am following below instruction.

https://www.pspice.com/resources/application-notes/brushless-dc-motor-model

Questions

why the unit of the inertia is g*cm*sec*sec? It should be mass * length * length
There are a number of parameters. Unfortunately, I can not gather all of them from motor provider. I am wondering to what extend of details, we shall consider.
How to understand the below SPICE directives in the bldcmotor.lib.
- why there is only winding1 and 2?
- The node number 3 or 4 refer to what?

* The electrical model: backemf, resistance, and capacitance
Ebackemf winding1 3 VALUE = {Cb * V(shaft_speed) * V(factor) }
Vsense 3 4 0v ; measure winding current
Rwinding 4 winding2 {CR}
* Place half the winding capacitance at each end of the winding.
C1 winding1 0 {CC/2}
C2 winding2 0 {CC/2}

Cheers

Ichiro

#2 Sat, 2021-04-24 07:53

kahraman

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Last seen: 2 years 12 months ago

Joined: 2021-04-24 07:35

Hello there
I am a university student, I am facing the same problems. I have studied many forms. I am especially trying to control the BLDC motor control from the Matlab environment. Especially in order to control the operation of the system in a simple way, I try to move it at a constant speed with the Trapezoidal control method.
But somehow I could not get the performance I wanted. I could not write the parameters suitable for my engine because of the units in the spice file. It works flawlessly when I set up my system only with blocks in a matlab environment. But in a spice environment, a hardware 2-
When I install a level inverter structure and apply 120 degree Trapezoidal structure and I set it up on matlab, it doesn't work as I want. What is the reason of this ? Can you help me ? I can share the simulation file. I have been looking for a sample study on this for about 3 weeks, but I could not find it.

Regards.