Stepping-motor driving circuit

Details Stepping-motor driving circuit Stepping-motor driving circuit

1987-03-20

1988-07-26

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

047603208

ABSTRACT:
A stepping motor driving circuit of this invention is disclosed which includes a stepping motor having excitation coils M1 through M4. Respective excitation coils M1 through M4 are sequentially excited respectively by transistors T1 through T4 on the basis of a predetermined excitation timing. An excitation current is supplied through transistor T5 to excitation coils M1 and M2, while an excitation current is flowed through transistor T6 to excitation coils M3 and M4. The ON/OFF operation of transistors T5 and T6 is performed by a first pulse signal and second pulse signal, noting that the first pulse signal is generated in synchronization with an excitation timing and has a pulse width corresponding to a time required for the excitation current to reach a predetermined level and the second pulse signal is of a high frequency wave type having a smaller pulse width than that of a first pulse signal and is generated during a time period in which the generation of the first pulse signal is stopped.

REFERENCES:
patent: 4358725 (1982-11-01), Brendemuehl

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