Anti-saturation control method for hydraulic system of permanent magnet synchronous motor for injection molding machine
A technology of permanent magnet synchronous motor and hydraulic system, applied in the field of AC motor drive, can solve problems such as production process and product quality impact
Active Publication Date: 2021-12-21
HANGZHOU DIANZI UNIV
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Problems solved by technology
[0004] In order to ensure production efficiency, the process of injection molding machine requires fast action conversion. For example, the pressure rise is limited to within 0.5 seconds. Since the hydraulic system uses oil as the transmission medium and has a large inertia, the conventional permanent magnet synchronous motor pressure ring PI algorithm is adopted. Pressure overshoot often occurs in the pressure starting stage, and a large pressure overshoot will affect the production process and product quality
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[0030] Below in conjunction with accompanying drawing, the present invention will be further explained;
[0031] The sensorless permanent magnet synchronous motor hydraulic system vector control system of this embodiment is as follows: figure 1 As shown, including permanent magnet synchronous motor, three-phase voltage source inverter, space vector PWM modulation unit, current detection and conversion unit, direct axis current regulator, quadrature axis current regulator, speed regulator, and position and speed computing unit. The anti-saturation control method acts on the anti-saturation controller composed of PI control unit and anti-saturation unit, in which the anti-saturation coefficient is designed as the regulation rate to make the hydraulic overshoot smaller. The output of the pressure loop is figure 1 The speed loop given by the vector control system shown n r .
[0032] An anti-saturation control method for a hydraulic system of a permanent magnet synchronous mot...
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The invention discloses an anti-saturation control method for a hydraulic system of a permanent magnet synchronous motor used in an injection molding machine. The control method specifically includes setting a PI control unit and an anti-saturation unit, and then adjusting the anti-saturation output by adjusting the anti-saturation coefficient, so as to realize the anti-saturation control of the system. In the control process, the pressure loop controller is designed as an anti-saturation PI control form, and the anti-saturation coefficient is designed as a variable parameter to adapt to different hydraulic characteristics and hydraulic actions, which can prevent pressure overshoot from causing damage to the production process and product quality. adverse effects.
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 an anti-saturation control method for a hydraulic system of a permanent magnet synchronous motor for an injection molding machine. Background technique [0002] Injection molding machine, also known as injection molding machine, is the main molding equipment for making thermoplastics or thermosetting plastics into plastic products of various shapes using plastic molding molds. At present, more than 80% of plastic processing products are injection molded. With the development of China's plastic processing industry, the output of injection molding machines is increasing year by year. The process of injection molding machine is generally divided into several stages such as mold clamping, mold locking, glue injection, pressure holding, melting glue, cooling, mold loosening, m...
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IPC IPC(8): B29C45/82B29C45/67
CPCB29C45/82B29C45/67
Inventor 吴茂刚李庆松李平
Owner HANGZHOU DIANZI UNIV