步进电机直驱滑阀工作点保持力矩试验方法研究OA

During the transition of a stepper motor direct-drive slide valve from zero to maximum opening,the electromagnetic torque of the stepper motor is required to reliably balance the holding torque at each operating point of the slide.Under constant-current control,the electromagnetic torque of the stepper motor decreases with increasing temperature,and dead zones and saturation regions exist in the relationship between electromagnetic torque and motor current.These factors prevent accurate matching between electromagnetic torque and the holding torque at slide operating points.To address this problem,based on the current-electromagnetic torque characteristics of the stepper motor and slide mechanical theory,the torque constant is identified as the key parameter affecting the torque balance.An experimental scheme for torque constant identification is designed.Linear regression is applied to fit the current-electromagnetic torque characteristic curve.The torque constant Kt is identified as 0.413±0.01 N·m/A,and the linear current range is 0.4～2.3 A.Static torque thresholds at spool operating points are tested to ensure reliable valve operation under hydraulic force limits.Finally,a current-displacement matching method based on holding torque parameters within the linear torque range is proposed.Experimental results show that,compared with conventional constant-current control,the proposed method achieves lower motor energy consumption.