Method for driving three phase stepping motor
First Claim
1. A method for two-three phase driving of a three-phase stepping motor having a Y-connection with three respective coils and terminals comprising the steps of:
- a) energizing the respective coils, to provide a two-phase excitation, by an input driving current having values at the respective coils defined by a set of normalized values which are ±
0.87 and 0;
b) energizing the respective coils, to provide a three-phase excitation, by an input driving current having values at the respective coils defined by a set of normalized values which are ±
1 and ±
0.5,c) repeating, alternately, steps a) and b) to provide two-three phase excitation driving of said three-phase stepping motor, wherein the normalized values during two-phase excitation are achieved by varying the input driving current between the two-phase excitation of step a) and the three-phase excitation of step b),whereby the input driving current values for the respective coils approximate a sine wave having the normalized values of ±
1, ±
0.87, ±
0.5 and 0 in order to minimize vibration.
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Accused Products
Abstract
As a method for energizing a three-phase stepping motor of Y-connection, driving current values are set to be values resembling sine wave input approximation, thus making it possible to effect driving at small vibration. Energizing of the three-phase stepping motor is performed by a two-three phase driving scheme which calls for alternately effecting a two-phase excitation of the coils in the motor and a three-phase excitation of the coils in the motor. The driving current flowing through each of the coils approximates a sine wave having normalized values defined by ± 1, ± 0.87, ± 0.5 and 0.
39 Citations
2 Claims
-
1. A method for two-three phase driving of a three-phase stepping motor having a Y-connection with three respective coils and terminals comprising the steps of:
-
a) energizing the respective coils, to provide a two-phase excitation, by an input driving current having values at the respective coils defined by a set of normalized values which are ±
0.87 and 0;b) energizing the respective coils, to provide a three-phase excitation, by an input driving current having values at the respective coils defined by a set of normalized values which are ±
1 and ±
0.5,c) repeating, alternately, steps a) and b) to provide two-three phase excitation driving of said three-phase stepping motor, wherein the normalized values during two-phase excitation are achieved by varying the input driving current between the two-phase excitation of step a) and the three-phase excitation of step b), whereby the input driving current values for the respective coils approximate a sine wave having the normalized values of ±
1, ±
0.87, ±
0.5 and 0 in order to minimize vibration. - View Dependent Claims (2)
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Specification