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# Simulating a shaft.

#### Lightium

##### Member
Using LTspice is it possable to simulate a shaft with or without a flywheel?

#### crutschow

##### Well-Known Member
Using LTspice is it possable to simulate a shaft with or without a flywheel?
Not at all clear what you are trying to do with an electrical simulation of a mechanical device.(?)

#### Lightium

##### Member
There's got to be an electrical equivalent of a rotating shaft. Yes/no?

#### crutschow

##### Well-Known Member
There's got to be an electrical equivalent of a rotating shaft. Yes/no?
Well if it has mass, then it has inertia, so that can be simulated by an inductance.
The inertial energy of a rotating shaft is similar to the energy stored by an inductor with current going through it.
The rotational energy is:

The inductive energy is:

E = 1/2 LI²
where L= inductance
I = current

Is that what you are looking for?

Last edited:

#### Lightium

##### Member
That's what I am doing I am using inductors. Your equation looks to be very helpful, thank you.

#### alec_t

##### Well-Known Member
Ages ago I simulated a DC motor by specifying the rotor's moment of inertia and using behavioural voltage sources and integration functions to represent torque, acceleration, angular velocity, back-emf.

#### Lightium

##### Member
Is this schematically correct for a shaft with magnetic armatures?

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