in case of permanent magnet synchronous motor what is the need of Tm?

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jasaswini mohanty 2015-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/169349-in-case-of-permanent-magnet-synchronous-motor-what-is-the-need-of-tm

评论： A Jenkins 2015-1-12

i think the field is permanent magnet and for the armature ckt supply is done from the switches. so what is the need of Tm?

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Answer 1

A Jenkins 2015-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/169349-in-case-of-permanent-magnet-synchronous-motor-what-is-the-need-of-tm#answer_164414

编辑：A Jenkins 2015-1-9

If you are intending to use it as a motor, then you would apply a voltage to it and want to see some mechanical torque (Tm) come out of it, right? And then you would supply that torque to some kind of mechanical load?

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jasaswini mohanty 2015-1-12

my doubt still persists. for a motor voltage is input and torque is output then what is the need of another torque input? again Tm is not equal to load torque i guess so why an extra input?

A Jenkins 2015-1-12

To calculate the motor's angular speed, the model must know the difference between the Electromagnetic Torque Te, and the Mechanical Torque Tm (in addition to friction and inertia values).

If you do not want to supply Tm, then you would need to supply the speed directly. There is an option for this under Block Parameters -> Mechanical Input.

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