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AC/DC rmm module - bug report

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In the 2D generator tutorial, I changed the prescribed rotational velocity from 'rpm' to 'rpm*tri1(t[1/s])'. tri is a triangle function. Therefore the rotation speed should first increase, then decrease. As a consequence, the amplitude of the induced voltage should first increase, then decrease.
But the rotation speed first increases positively till tri(t) is maximal, then stops, then increases negatively. As a consequence, the induced voltage increases, then goes back to 0, then increases again.
What can I do to correct this ?

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L. Queval

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