Method and arrangement for determining the position of a rotor in a brushless motor or in stepper motor

摘要

Method for determining the position of a rotor in a brushless motor or in a stepper motor, said method including the following steps: applying a voltage in at least one powered phase of the motor; measuring, in an unpowered phase of the motor, the voltage induced by mutual inductance between phases; and determining said position and/or the speed of the rotor from said induced voltage.

主权项

1. Method for determining the position and/or the speed of a rotor in a brushless motor or stepper motor, having the following steps:
applying a voltage and/or of a current in at least one powered phase of the motor; measuring in an unpowered phase of the motor the induced voltage by mutual inductance between phases; determining said position and/or speed of the rotor from said induced voltage; wherein said voltage and/or said current is pulse-width modulated with periods during which at least one phase is powered through at least one transistor and periods during which at least one said transistor is blocked so as to modify the current in said at least one phase.