Browse Prior Art Database

Full and Half Step Drive for Three Phase Stepping Motor

IP.com Disclosure Number: IPCOM000082802D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Fleek, AE: AUTHOR

Abstract

Full and half-step operation of a 3 Phi stepping motor is obtained using the circuit shown in Fig. 1A. As shown, a 12-position shift register 10 is so connected that when input M is present, each trigger of the register is gated by its respective input 1-12. When input M is not present each trigger is gated by the preceding trigger. For example A1 gates A2. In addition S gates trigger A1.

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Full and Half Step Drive for Three Phase Stepping Motor

Full and half-step operation of a 3 Phi stepping motor is obtained using the circuit shown in Fig. 1A. As shown, a 12-position shift register 10 is so connected that when input M is present, each trigger of the register is gated by its respective input 1-12. When input M is not present each trigger is gated by the preceding trigger. For example A1 gates A2. In addition S gates trigger A1.

Fig. 1B shows details of the first stage 11 of the shift register 10 which is typical for each stage, and Fig. 1C the details of the output logic 14. Input S is the input for the first stage. For succeeding stages A2-F2 input is internally connected from the trigger of the preceding stage. The M input gates either the S input or the inputs 1-12. Input C clocks the trigger on or off depending on the level at NG or FG.

The register is initialized by bringing up Reset, followed by one Motor Advance signal. In the half-step mode the last two triggers F1 and F2 are turned on, in the full-step mode triggers E2, F1 and F2 are turned on.

Figs. 2 and 3 show the pulse trains produced at the outputs ABC DE and F in the half-step and full-step modes, respectively, for driving the motor.

With input M not present (right direction) in half-step drive, A is turned on with the first Motor Advance pulse then F is turned off on the second pulse. The third pulse turns B on and the fourth turns A off.

When input M is present (left direction) th...