Stepper motor with vernier control mode

Details Stepper motor with vernier control mode Stepper motor with vernier control mode

1992-03-10

1993-05-04

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

052085236

ABSTRACT:
A stepper motor in a magnetic tape cartridge head positioning system applies vernier control to achieve a final target after a preliminary target has been achieved by stepping. The vernier control is provided by a closed loop servo system in which current is applied to stator coils selected so that the target is at a torque maximum rather than at a torque null. Current proportional to a servo error signal is applied to selected stator coils so that the torque is sufficiently linearly related to position to permit classical linear servo analysis for the design of a stable, non-oscillating system. An example of stator coil selection for advancing and retarding a permanent magnet stepper motor operated in eight half steps is provided below in Table 1.

REFERENCES:
patent: 4618808 (1986-10-01), Ish-Shalom et al.
patent: 4788482 (1988-11-01), Tachibana et al.

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