— 产品中心 —
邮箱:A3669372910@163.com
手机:17359299796
电话:17359299796
地址:福建省漳州市龙文区朝阳北路1号办公楼205室
FOXBORO FBM240 控制器 福克斯波罗美国模块品牌Foxboro是否进口否产地美国加工定制否可售卖地全国型号FBM240变频器先将工频交流电整流成直流电,逆变器在微控制器的控制下,将直流电逆变成不同频率的交流电。目前市场上的变频器都是按这种工作原理工作的。其中R0起限流作用,当R、S、T端子上的电源接通时,R0接入电路,以限制启动电流。延时一段时间后,晶闸管VT导通,将R0短路避免不必要
产品详情
FOXBORO FBM240 控制器 福克斯波罗美国模块
变频器先将工频交流电整流成直流电,逆变器在微控制器的控制下,将直流电逆变成不同频率的交流电。目前市场上的变频器都是按这种工作原理工作的。其中R0起限流作用,当R、S、T端子上的电源接通时,R0接入电路,以限制启动电流。延时一段时间后,晶闸管VT导通,将R0短路避免不必要的损耗。
Rt为能耗制动电阻,当制动时电动机进入发电状态,逆变器向电容C反向充电,当直流回路的电压(电阻R1和R2上的电压)升高到一定值时,通过泵升电路使开关器件Vb导通,这样电容C上的电能就消耗在电阻Rt上了,通常为了散热,制动电阻Rt安装在变频器的外测,或者加装制动单元。
电容C除了参与制动外在电动机运行时,主要起到滤波的作用。起滤波作用是电容的变频器称为电压型变频器;起滤波作用是电感的变频器称为电流型变频器。市场上比较多的为电压型变频器。
微控制器经过运算输出控制用的正弦信号,经过SPWM(正弦脉宽调制)发生器调制,再由驱动电路放大信号,放大后的信号驱动6个功率晶体管,产生三相交流电压U、V、W驱动电机运转。
The inverter first rectifies the power frequency alternating current into direct current, and the inverter converts the direct current into alternating current of different frequencies under the control of the microcontroller. At present, the inverter on the market works according to this working principle. When the power supply on the R, S, and T terminals is connected, R0 is connected to the circuit to limit the starting current. After a delay of some time, the thyristor VT is switched on and the R0 is short-circuited to avoid unnecessary loss.
Rt is the energy consumption brake resistor, when the motor enters the power generation state when braking, the inverter reversely charges the capacitor C. When the voltage of the DC circuit (the voltage on the resistors R1 and R2) rises to a certain value, the switching device Vb is switched on through the pump lift circuit, so that the electric energy on the capacitor C is consumed on the resistance Rt, usually in order to heat dissipation. The brake resistance Rt is installed on the outside of the inverter, or the brake unit is added.
In addition to participating in the braking of the external motor operation, capacitor C mainly plays the role of filtering. The frequency converter whose filtering function is capacitance is called voltage frequency converter; The frequency converter that acts as the filter is the inductance is called the current type frequency converter. More on the market for voltage inverter.
The microcontroller outputs the sinusoidal signal for control after operation, which is modulated by the SPWM(sinusoidal pulse width modulation) generator, and then amplified by the drive circuit. The amplified signal drives 6 power transistors, and generates three-phase AC voltage U, V, and W to drive the motor.
相关推荐