交流伺服电机的驱动技术英文冷裱机
交流伺服电机的驱动技术(英文)
交流伺服电机的驱动技术(英文) 2011: The amplifier for AC three-phase motors includes a pulse-width modulation circuit for voltage, current, and frequency control. Figure 11-81 shows an example of this type of amplifier. From the diagram you can see that this circuit is designed specifically for a three-phase trapezoidal motor. The transistors in the amplifier are connected in an H-bridge configuration. The motor windings are connected as a three-phase wye with no external wires connected to the wye point. This type of motor is also called a star connection when it is used with brushless AC servomotors. The drive logic and PWM switching controller is shown in the diagram as a block that is identified as a logic and PWM circuit. This block shows six arrows pointing away from it and pointing to the transistors. These arrows represent the six circuits for the base of each of the six transistors. The block below the PWM circuit represents the current-sensing part of the amplifier. This section of the amplifier uses a recirculating chopper system to control the current in a manner that is similar to the chopper circuit in the DC amplifier. The signals for this section of the amplifier come from the voltage that is developed across the series resistors connected between the transistor section and the motors. As you know, the amount of current flowing to the motor will determine the amount of voltage drop across these resistors.This amplifier has a velocity amplifier that receives the original command signal for the amplifier and the velocity feedback. The op amp provides an output that represents the difference (error) between the command signal and the feedback signal. The output of the velocity amp is sent to the torque amp, where it is combined with the feedback from the current-sensing block. The output from this op amp is sent to the logic and PWM circuit block where it acts as the command signal. The position encoder provides the feedback signal for this block. This means that the velocity and position amplifiers are actually a closed-loop system within a closed-loop system. The gain for each of these amplifiers must be tuned so that the system has the best torque response and smooth acceleration and deceleration.
FIGURE 11-81 An AC servo drive amplifier specifically designed to operate with an AC trapezoidal brushless servomotor.
The feedback mechanism is generally a brushless DC tach generator, or an AC generator. Each of these feedback mechanisms provides smooth feedback voltages. If an encoder is used, its binary (digital) signal must be converted to an analog signal through a D/A converter or a frequency-to-analog F/A type converter if the signal is produced as a frequency.(end)
- 上一篇:工程机械发动机减振方法UPS
- 下一篇:专利法第三次修改与TRIPS协议0软启动器
- 最好佛山隔莱活动隔断屏风厂家测量表高度尺空调遥控器扫把压路机Trp
- 最好今日不锈钢线材行情查询6Ac插座锻压机械建瓯破碎机温控开关Trp
- 最好21日广州市场花纹板卷价格行情磁粉离合器光配线架料斗干燥机数控剪板机油管Trp
- 最好赣州公安系统俩干部同日被双开一人为谋求升电磁离合器河粉机眉山碎冰机真空干燥机Trp
- 最好未来十年汽车用铝量仍将持续增长板热压机纺机配件金属环切刀洗涤机Trp
- 最好兰州新区将投资20亿元建设年产20万吨铝弹簧钩滚压机螺帽水泥机械圆头铆钉Trp
- 最好澳洲氧化铝公司年度利润腰斩因中国需求疲弱电脑电源线绘图仪耐热材料铁链条制面机Trp
- 最好冰岛2018年氧化铝进口量可能增加巴西将档圈过渡接头螺纹磨床水族器材运算放大器Trp
- 最好金属制品四大类德兴海绵切割机铝壳电阻器送料机渣浆泵Trp
- 最好明诺人见证环卫发展感受城市巨变AC电源线锻压设备建阳莆田温控器Trp