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Unformatted text preview: Introduction to Embedded Microcomputer Systems Lecture 32.1 Jonathan W. Valvano Stepper Motors Figure 8.24. Photo of three stepper motors. http://users.ece.utexas.edu/~valvano/Datasheets/ Look for data sheets with Stepper in it. Comes in 24,48,200,400 steps/rotation 0101 0110 1010 1001 Interface Bipolar stepper A- +- + B 0101 0110 1010 1001 Interface Unipolar stepper- + +V- +- + +V- + A B A B Figure 8.25. A bipolar stepper has 2 coils, but a unipolar stepper divides the two coils into four parts. To rotate this stepper by 90 o , the interface flips the direction of one of the currents. Rotor Stator B A B A I I I I S N S N Output = 0101 B A B A I I I I N S N Output = 0110 B A B A I I I I N S N S Output = 1010 A B Flip B Flip A B A B A I I I I S N N S Output = 1010 Flip A Flip B N S S N S N S N S Introduction to Embedded Microcomputer Systems Lecture 32.2 Jonathan W. Valvano Name Output Next S6 0110 S5 0101 S10 1010 S9 1001 Figure 8.27. This stepper motor FSM has four states. The 4-bit outputs are given in binary. Figure 8....
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- Fall '10