The Simulated Source Movement Control System

Discussing of a low cost, big moment of inertia, high precision position servo system and a low cost, high speed, multi-channel data acquiring system based on PCI bus have been done in this paper. These two systems have been successfully applied to phased array antenna system, and have gained excellent effect.The low cost, big moment of inertia, high precision position servo system adopts the open loop control in step servo. Using the advanced chip for two phase hybrid step motor micro-step controls-IXMS150, a high power step motor driver which can be operated by full step, half step, 4, 8, 16, 32, 64,128 micro-steps was successfully designed. And the driver can implement electric current feedback control. The control way of the constant current chop wave and PWM (pulse wide modulate) was used in the driver. The power magnifier used the AC coupled H-bridge by two N-channel and two P-channel power MOSFETS. We need not converse from AC to DC with the AC coupled H-bridge. The peak value of the output current can be up to 6A, and this makes cost lower. The driver can control two phase hybrid step motor of 130 type (130BYG). Using this way, we can design the step motor driver whose peak value of the output current can be up to tens of ampere and whose each step can be highly subdivided. Only modifying the driver's interface (such as to USB, serial port or parallel port etc.), a universal two phases hybrid step motor driver of 130 type and 150 type can be acquired which each step can be subdivided into 128 micro-steps (up to 250 micro-steps). This subdividable driver of 130BYG & 150 BYG cannot be acquired in our country's markets.The multi-channel data acquiring system based on PCI bus has 32 analog channels and its throughput rate is up to 20MSPS. Using the PCI interface chip-PCI 9030, which was newly developed by PLXCo Inc in USA, make the local bus and the PCI bus asynchronism operation. The flexible local bus runs up to 60 MHz and but the PCI bus runs 33 MHz. The local bus burst transfers up to 240 MBps and the PCI bus burst transfers up to 132 MBps. The data buffers are integrated in the system, because of assuring data transfers of high speed data acquire. A low cost, high performance and high speed ADC chip, AD9225 was used, which was developed by AD Co Inc in USA. Its throughput rate is up to 25MSPS. To make cost lower and data process simple and easy, we used four ADC chips and each ADC chip was shared by 8 analog channels. This system can be adopted in universal high speed multi-channel data acquire block based on PCI bus. The data acquire block based on PCI bus can be bought in the domestic market, but its throughput rate can not be up to 20MSPS and its analog channels cannot be up to 32. E.g. PCI 1710 based on PCI bus which was designed by Advanteh Co Inc, its ideal throughput rate is only up to 100KSPS and has only one ADC chip shared by 16 analog channels.