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Pressure overshoot suppression method of permanent magnet synchronous motor hydraulic system for die casting machine

A permanent magnet synchronous motor and hydraulic system technology, applied in the direction of motor generator control, electromechanical brake control, control system, etc., can solve problems such as pressure overshoot, high system pressure, and affecting product molding quality, so as to suppress pressure overshoot , The effect of small pressure overshoot

Pending Publication Date: 2022-03-25
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] The working characteristics of the die-casting machine are short start-up time, large start-up flow, and high system pressure. Due to the inertia of the hydraulic oil, it is easy to cause pressure overshoot when the pressure is maintained after the start-up. Larger pressure overshoot will not only shorten the The life of the die-casting machine will also affect the molding quality of the product

Method used

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  • Pressure overshoot suppression method of permanent magnet synchronous motor hydraulic system for die casting machine
  • Pressure overshoot suppression method of permanent magnet synchronous motor hydraulic system for die casting machine
  • Pressure overshoot suppression method of permanent magnet synchronous motor hydraulic system for die casting machine

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Embodiment Construction

[0019] The present invention will be further explained below in conjunction with accompanying drawing:

[0020] figure 1 The structural diagram of the vector control system of the permanent magnet synchronous motor hydraulic system used in this embodiment includes a three-phase permanent magnet synchronous motor, a voltage source inverter, a space vector PWM modulation unit, a current detection and conversion unit, and a direct axis Current regulator, quadrature axis current regulator, speed regulator, pressure regulator and speed limiter, position and speed calculation unit.

[0021] figure 2 It is a schematic diagram of the pressure overshoot suppression unit of the permanent magnet synchronous motor hydraulic system used in the die casting machine used in this embodiment. In the figure, p is pressure feedback, n lit is the speed limit value.

[0022] image 3 It is a schematic diagram of the variation of the speed limit value of the hydraulic system of the permanent m...

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Abstract

The invention discloses a pressure overshoot suppression method of a permanent magnet synchronous motor hydraulic system for a die casting machine. A pressure overshoot suppression unit is arranged, and when the pressure feedback value reaches a suppression threshold value, the pressure overshoot suppression unit is started to limit the rotating speed of the motor; the pressure overshoot suppression unit takes pressure feedback as input and outputs a rotating speed amplitude limiting value through linear calculation; and setting a pressure overshoot suppression coefficient, controlling the suppression intensity of the rotating speed amplitude limiting value, and adjusting the coefficient to achieve the optimal suppression effect. Compared with a permanent magnet synchronous motor hydraulic system for a common die-casting machine, the permanent magnet synchronous motor hydraulic system for the die-casting machine adopting the method is small in pressure overshoot.

Description

technical field [0001] The invention belongs to the technical field of AC motor transmission, and relates to a control method for a hydraulic system of a permanent magnet synchronous motor, in particular to a pressure overshoot suppression method for a hydraulic system of a permanent magnet synchronous motor for a die-casting machine. Background technique [0002] The die-casting machine is a machine that injects molten metal into a mold through hydraulic pressure to cool and form it under pressure, and obtains a solid metal casting after the mold is opened. It is mainly composed of clamping mechanism, injection mechanism, hydraulic system and electrical control system. Die casting machines are widely used in industrial production and play an important role in modern industry. [0003] The die-casting process mainly includes actions such as mold closing, injection, pressure maintaining, mold opening, and ejection. The hydraulic system provides the power required for the ope...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/18H02P21/22H02P25/022H02P27/12B22D17/32
CPCH02P21/14H02P21/18H02P21/22H02P25/022H02P27/12B22D17/32H02P2207/05
Inventor 吴茂刚李庆松李平
Owner HANGZHOU DIANZI UNIV
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