FC-PSU-UNI2450U V1 欧美备件 DCS系统 PLC模块

FC-PSU-UNI2450U V1 欧美备件 DCS系统 PLC模块

FC-PSU-UNI2450U V1 欧美备件 DCS系统 PLC模块

M/T测速法虽然具有一定的测量精度和较宽的测量范围，但这种方法有其固有的缺陷，主要包括:

1)测速周期内必须检测到至少一个完整的码盘脉冲，限制了可测转速;

2)用于测速的2个控制系统定时器开关难以严格保持同步，在速度变化较大的测量场合中无法保证测速精度。

因此应用该测速法的传统速度环设计方案难以提高伺服驱动器速度跟随与控制性能主流的伺服驱动器均采用数字信号处理器(DSP)作为控制核心，可以实现比较复杂的控制算法，实现数字化、网络化和智能化。

功率器件普遍采用以智能功率模块（IPM)）为核心设计的驱动电路JPM内部集成了驱动电路,同时具有过电压、过电流、过热、欠压等故障检测保护电路,在主回路中还加入软启动电路以减小启动过程对驱动器的冲击。

功率驱动单先通过三相全桥整流电路对输入的三相电或者市电进行整流，得到相应的直流电。经过整流好的三相电或市电，再通过三相正弦PWM电压型逆变器变频来驱动三相永磁式同步交流伺服电机。功率驱动单元的整个过程可以简单的说就是AC-DC-AC的过程。整流单元(AC-DC)主要的拓扑电路是三相全桥不控整流电路。

FC-PSU-UNI2450U V1 欧美备件 DCS系统 PLC模块

Although the M/T velocity measurement method has a certain measurement accuracy and a wide measurement range, this method has its inherent defects, mainly including:

1) At least one complete code pulse must be detected during the speed measurement period, which limits the measurable speed;

2) The timer switches of the two control systems used for speed measurement are difficult to maintain strict synchronization, and the accuracy of speed measurement cannot be guaranteed in the measurement occasions with large speed changes.

Therefore, it is difficult to improve the speed following and control performance of servo drivers by using the traditional speed loop design method. The mainstream servo drivers all use digital signal processor (DSP) as the control core, which can realize more complex control algorithms and realize digitalization, networking and intelligence.

The power device generally adopts the drive circuit designed with the intelligent power module (IPM) as the core. The drive circuit is integrated inside the JPM, and has the fault detection protection circuit such as overvoltage, overcurrent, overheating and undervoltage. The soft start circuit is also added to the main circuit to reduce the impact of the start process on the driver.

The power driver first rectifies the input three-phase or mains through the three-phase full-bridge rectifier circuit to obtain the corresponding direct current. The three-phase permanent magnet synchronous AC servo motor is driven by the three-phase sinusoidal PWM voltage inverter after the rectified three-phase power or mains. The whole process of the power drive unit can be simply said to be the AC-DC-AC process. The main topological circuit of the rectifier unit (AC-DC) is the three-phase full-bridge uncontrolled rectifier circuit.