Stepping motor drive control apparatus
AssigneeCanon Denshi Kabushiki Kaisha
InventorsKazuto Yamamoto, Kazushi Takahashi
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Abstract
A stepping motor drive control apparatus for controlling the drive of a stepping motor having a plurality of phase coils which are respectively excited to switch the phase. A cycle of a step signal which steps the stepping motor is measured. According to the measured cycle of the step signal, a switching time of the phase coil to be excited is variably set, so that damping and noise are prevented when the stepping motor is driven.
Claims10
A stepping motor drive control apparatus for controlling the drive of a stepping motor in accordance with a step signal, said stepping motor having a plurality of phase coils which are respectively excited by an excitation system by switching said plurality of phase coils to rotate said stepping motor, said control apparatus comprising:
- measuring means for measuring a cycle of said step signal, said step signal stepping said stepping motor;
- exciting means for switching at least one of said plurality of phase coils of said stepping motor to excite said at least one coil;
- and
- control means for controlling the switching time of said at least one of said plurality of phase coils excited by said exciting means, such that damping of said stepping motor is minimized in response to a cycle of said step signal measured by said measuring means.
A stepping motor drive control apparatus for controlling the drive of a stepping motor in accordance with a step signal, said stepping motor having a plurality of phase coils which are respectively excited by an excitation system by switching said plurality of phase coils to rotate said stepping motor, said control apparatus comprising:
- measuring means for measuring a cycle of said step signal, said step signal stepping said stepping motor;
- exciting means for switching at least one of said plurality of phase coils of said stepping motor to excite said at least one of said plurality of phase coils;
- and
- control means for controlling said switching time of said phase coils of said stepping motor in said exciting means in response to said cycle of said step signal measured by said measuring means, so that said switching time of said phase coils in said stepping motor coincides with a time at which said cycle of said step signal measured by said measuring means is equally divided.
A stepping motor drive control apparatus for controlling the drive of a stepping motor in accordance with a step signal, said stepping motor having a plurality of phase coils which are respectively excited by an excitation system by switching said plurality of phase coils to rotate said stepping motor, said control apparatus comprising:
- measuring means for measuring a cycle of said step signal, said step signal stepping said stepping motor;
- exciting means for measuring whether a measured time reaches a switching time when at least one of said plurality of phase coils in said stepping motor is switched to be excited, said at least one phase coil to be excited being switched to be excited when the measured time reaches said switching time;
- first setting means for setting said switching time of said at least one phase coil to be excited by said exciting means in accordance with an external command;
- and
- second setting means for setting said switching time of said at least one phase coil to be excited by said exciting means in accordance with said cycle of said step signal measured by said measuring means such that damping of said stepping motor is minimized.
Dependencies are inferred from the claim text.