Operating Characteristics of Variable Speed Fixed Pump Based on Torque Control
When using a variable speed motor to drive a fixed pump as an electro-hydraulic power source,pressure control is achieved by controlling the speed,which is difficult to adapt to the rapidly changing load flow conditions.Using a servo motor to drive a fixed pump through direct torque control to achieve pressure control has the advantage of faster dynamic response compared to variable speed pressure control.However,due to the influence of nonlinear factors such as rotational speed,there is a non-linear correspondence between torque and pressure,which leads to significant pressure control deviation in open-loop control.Therefore,this research proposes to use a 2D chart of speed and pressure control deviation that can be iteratively generated offline for speed compensation in open-loop pressure control.Through theoretical analysis and digital simulation,the results show that under the same conditions,compared with the pressure control scheme using fitted curves for speed compensation,the pressure control error is reduced to 2％.This scheme can better achieve pressure control.
electro-hydraulic power sourcepressure controltorque control2D chart
万方数据
维普
