| Abstract |
In this paper, a new speed and position adaptation algorithm for sensorless
control of the permanent-magnet synchronous motor (PMSM) is proposed. The scheme uses information available in the back-emf and is novel in two respects. First, a voltage error rather than a flux or current error is used for adaptation. Secondly, only the steady-state electrical equations of the PMSM are simulated. This is sufficient, if fast closed-loop current control is employed. The result is a very simple algorithm, requiring
only 9 multiplications and one division for digital implementation. The algorithm is very robust against inaccurate model parameters, the only sensitive parameter being the q
direction inductance. Experimental results demonstrate the effectiveness of the method. The position estimation error remains smaller than 5 electrical degrees at steady-state (even at low speeds) and 20° at transients (at nominal speeds). |
