Two-Phase PMLSM mathematical model

Hi,

I have troubles in creating the two phase PMLSM mathematical model which I´m using in my thesis.

The products that I´m using:

https://shop.linmot.com/E/linear-motors/linear-motors-p01-37/stators-ps01-37x240/ps01-37x240f-c.htm

https://shop.linmot.com/E/sd.e12.1/servo-drives/drives-for-motors-p0x-&-pr0x/series-e1200/e1250-pl-uc.htm

The Inverter is supplied by 74V DC and converts the DC voltage for supplying the motor, which has Two-Phases

I´ve looked threw many thesis, and matlab examples/threads etc.. but I can't really manage to create mathematical model of two phase PMLSM, or adapt some existing one to my needs.

Can I somehow make the inverter + the motor from basic simscape blocks? Or could you please point me to some literature that could help me solve this problem?

Answer 1

[Kothuri]

Hi Stepan Dvorak,

To implement a two phase PMLSM mathematical model from Simscape blocks, you can use:

• Basic power electronics blocks (e.g., MOSFETs, diodes, and capacitors) to create the inverter.
• You can also use the “Universal Bridge” block in Simscape to model the inverter. You can configure it as a two-phase inverter to supply your PMLSM.
• You can use the “PMLSM” block and modify it to a two-phase configuration. This block usually represents a three-phase machine but by adjusting the parameters and simplifying you can create a two-phase equivalent.
• Customize the electrical and mechanical parameters of the motor such as the stator resistance, inductance, back EMF constant and the number of pole pairs.

Please refer to the following documentations to read more about these:

• PMLSM block - https://www.mathworks.com/help/sps/ref/pmlsm.html
• Universal bridge block - https://www.mathworks.com/help/sps/powersys/ref/universalbridge.html

[Stepan]

Hello,

Thank you for the answer. Can I ask you about the simplification of the PMLSM block? I´m not exactly sure, how should I implement it, because all I see are parameters for the 3 phase one.

Making matrix with only 2 params and third 0 shouldnt be it, because the two phase motors has voltages in the phases delayed by pi/2 (90°) and not by 120° as the three-phase has.

Unfortunately I dont have that much knowledge about this.