| 摘要 |
A rotational angle of a motor operative to propel forward a screw in an injection molding machine is detected at an encoder. An output from the encoder is employed to obtain an angular velocity omega of the motor. From the obtained angular velocity omega, an estimated melt pressure value deltaˆ that contains no differential term is derived using a certain observer theory. The estimated melt pressure value deltaˆ is employed to calculate a torque command value T<SUP>CMD </SUP>for the motor, which is fed back to the motor. Thus, precise propelling power control unaffected by noises can be executed without the use of a pressure sensor such as a load cell.
|
