Abstract
This paper presents a new method for the alignment of the rotor of permanent magnet synchronous motors with the phase axis of the stator during start-up. Once the rotor alignment is achieved, the real rotor position angle can be measured by using an incremental encoder and this value can be used in the field oriented control of the motor. Typically, a current is forced into the q-axis. In the proposed method a current is formed in the d-axis instead. Rotor alignment with the phase axis is achieved without any sudden motion by using a PI controller in the current loop. Preventive measures for exceptional situations that may occur during the application of this method are also discussed. Experimental results show that the performance of the proposed method is very satisfactory.
Highlights
Electric motors are used in many applications today
The torque of permanent magnet synchronous motors (PMSMs) is a result of the interaction force between the rotor flux and the stator flux
The torque developed by the PMSM is controlled by stator flux, which depends on the magnitude and position of the stator current
Summary
Electric motors are used in many applications today. direct current motors and induction motors are the most widely used types of electric motors, the use of permanent magnet synchronous motors (PMSMs) is increasing day by day due to their high energy density [1].The torque of PMSMs is a result of the interaction force between the rotor flux and the stator flux. Direct current motors and induction motors are the most widely used types of electric motors, the use of permanent magnet synchronous motors (PMSMs) is increasing day by day due to their high energy density [1]. Rotor flux is constant because it is created by permanent magnets placed on the rotor. For this reason, the torque developed by the PMSM is controlled by stator flux, which depends on the magnitude and position of the stator current. If the angle ( δ ) between the stator flux and the rotor flux is near zero, the generated torque may be very small. In this case, the motor may not rotate. The position of the rotor must be known so that the PMSMs can be controlled
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