METHOD AND ARRANGEMENT FOR DETERMINING THE POSITION OF A ROTOR IN A BRUSHLESS MOTOR OR IN STEPPER MOTOR
First Claim
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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.
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Abstract
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.
18 Citations
23 Claims
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1. Method for determining the position and/or the speed of a rotor in a brushless motor or stepper motor, having the following steps:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23)
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21. Arrangement for determining the position of a rotor and for powering a brushless or stepper motor, having:
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a switch circuit for selectively and alternatively powering one or several phases of said motor with a voltage and/or a current comprising a high-frequency component; a voltage detector for measuring the voltage induced in an unpowered phase by reason of the mutual inductance with the powered phases, and for generating a signal representative of said induced voltage; a processing circuit for calculating the rotor'"'"'s instantaneous position and/or speed from said signal.
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Specification