Control method of stepping motor

Abstract

A control method of a stepping motor is used for controlling the stepping motor of a dashboard. The control method of the stepping motor comprises the following steps of enabling the stepping motor to rotate a first angle to the origin of the dashboard through a full torque mode; enabling the stepping motor to rotate a second angle to the origin through a first torque mode, wherein the first torque mode is a first attenuation amount of the full torque mode, and the first attenuation amount is the minimum attenuation amount for continue rotation of the stepping motor; and enabling the stepping motor to rotate a third angle to the origin through a second torque mode, wherein the second torque mode is a second attenuation amount of the first torque mode, and the second attenuation amount is the minimum attenuation amount of continue rotation for the stepping motor. According to the control method of the stepping motor, a failure of returning to zero caused by too big strength of a pointer impacting a block needle and a failure of returning to zero caused by a big pointer reversing when the power is cut off can be avoided, and smooth operation of the pointer can be realized under the condition that the cost is not increased.

Description

technical field

[0001] The present invention relates to a control method, more specifically, to a control method of a stepping motor. Background technique

[0002] In recent years, due to the development of industry and commerce and the progress of society, the products provided are mainly aimed at convenience, reliability, and economic benefits. Therefore, the products currently developed are more advanced than before, and can contribute to society. In recent years, in order to reduce the cost of the stepping motor used in the instrument panel, the industry gradually tends to adopt the design without position sensor feedback. This design is called open loop control (open loop control) in control. ).

[0003] However, when restarting after a power failure, the stepper motor controller under open-loop control will lose the angle information of the rotor (rotor), causing the controller to be unable to perform correct position control on the stepper motor. In this regard, the...

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