Stepping motor driving device and driving method

Abstract

The invention provides a stepping motor driving device and a driving method, which perform drive control via monitoring a position relationship of an excitation stable point of a step motor and a rotor, thereby greatly reducing falling out of step, and can realize stable drive motion via torque control. An excitation phase control part (4) via calculating an excitation phase stable instruction making the excitation stable point in a stagger arrangement with the actual rotor position in a clockwise direction or an anti-clockwise direction, wherein the actual rotor position is obtained by a rotor position counter (7) when successive setting of excitation stable points makes rotor reach a rotor position indicated via utilizing position instructions of a controller (3), and outputs the excitation instructions corresponding to excitation phase set instructions to an electric motor driver (5), thereby controlling torque size and direction generated in the stepping motor (1).

Description

technical field [0001] The invention relates to a stepping motor driving device and a driving method. Background technique [0002] When performing torque control on a stepping motor, the torque control is performed by controlling the motor current value. As one method of torque control, there is a driving method that controls the motor current according to the driving load and speed (see Patent Document 1); as another method, there is a method of performing acceleration and deceleration, and constant speed by using a constant current value that does not lose the step. drive method. In addition, when controlling the motor current value with a constant current value, torque setting is performed by estimating a margin for the current value for preventing out of step. [0003] prior art literature [0004] Patent Document 1: Japanese Patent Application Publication No. 06-009439 Contents of the invention [0005] The problem to be solved by the present invention [0006] ...

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Problems solved by technology

On the other hand, in the driving method that does not implement current control that increases or decreases the motor current according to the size of the load, but uses a constant current value to perform acceleration and deceleration operation or constant speed operation of the motor, there is a problem that due to consideration of load fluctuations, And in order to prevent out-of-step and estimate a certain degree of margin to set the motor current, it will consume useless power

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