Position and speed estimation with improved integrator for synchronous motor

Abstract

In this paper a combined position and speed estimation algorithm for synchronous motor is presented The aim is to improve the ability to cancel initial position error as well as the robustness towards dc disturbance affecting the back-emf. Emphasis is placed on the dc drift and initial value problems due to the implementation of an integrator for motor flux estimation. Some existing algorithms together with a new Improved Integrator are presented and analyzed for showing their efficiency in term of solving the problem associated with pure integrator and achieving the combination objectives in both steadystate and dynamic operation. Experimental results are presented to substantiate the digital simulation.

Improved speed estimation in sensorless PM brushless AC drives

“…) is deduced from the measured current and voltage, then since the two are related in the rotor -reference frame by (8) where is the stator winding inductance, assuming a surface-mounted magnet rotor, the speed may be estimated from (9) The main merit of estimating the speed in this way is that it leads to a fast response. In the experimental drive system, it was estimated every 50 s, the same frequency as the rotor position estimation.…”

“…Basically, however, these can be classified into two categories: 1) those in which speed is estimated from an observer and the rotor position is obtained by integration [1]- [3] and 2) those in which the rotor position is estimated from an observer and the speed is calculated by differentiation [4]- [9]. However, in the first category, inaccuracies in the estimated rotor position may arise due to speed errors, the integration of a constant error, for example, resulting in an unreliable estimate of rotor position unless an appropriate compensating algorithm is employed.…”

Sensorless position and speed detection for permanent magnet synchronous motor

“…In a previous work this algorithm has been tested with a Synchronous Motor supplied by quasisinusoidal source [13]. At present the algorithm is implemented in the real concbtions where it will act (i.e.…”