Littelfuse 面向电机驱动器和软起动器的解决方案

Littelfuse和IXYS面向工业电机驱动器和软起动器的解决方案提供各类保护和控制元件，有助于在工业应用中延长电机寿命、提高能源效率。变频器 (VFD) 通过改变电机的输入电压和频率来控制交流电机的速度和转矩。软起动器可以实现平稳的电机启动和停止操作。虽然VFD和软启动器以相同的原理工作，但它们采用不同的架构并适用于不同的应用。可以对VFD进行编程，以根据流量、压力和其他因素来改变电机的速度。VFD适用于电梯、自动扶梯、破碎机、搅拌机等。电机达到其全速时，软起动器会被接触器过载电路旁路。软起动器非常适合用于输送机、泵和其他皮带驱动型应用。这些Littelfuse和IXYS电机驱动器和软起动器符合全球和北美安全标准。

VFDs & Auxiliary Power Supplies

The VFD lineup features fuses, diodes, and MOVs that protect equipment against various surges, including overload, short-circuit, transients, and lightning. The rectifiers convert AC line voltage to DC, while the IGBTs limit the DC bus voltage by switching the braking energy to a resistor. The IGBTs act as power inverters, and the NTC sensors indirectly measure the temperature of the power inverter semiconductor switches.

1. AC Input Protection - Fuses and Fuseholders 5. Inverters - Semiconductor Fuses

2. AC Input Protection - MOVs 6. Inverters - IGBT Modules, SMPDs, NTCs, and TVS Diodes

3. Rectifiers 7. Auxiliary Power Supplies

4. Brake Choppers 8. Switches

Soft Starter Topology

The soft starter products feature fuses, MOVs, SCR modules, thermistors, and switches. The fuses are designed for the supplementary protection of diodes, SCRs, IGBTs, and more. The SCR modules control the application of supply voltage to the motor, while the NTC sensors indirectly measure the temperature of the power inverter semiconductor switches. The MOVs protect equipment from damage caused by lightning-induced surges or harmonic voltage disruptions from the power line.

1. AC Input - AC Fuses 4. Phase Control - NTCs

2. AC Input - MOVs 5. Phase Control - Switches

3. Phase Control - Dual and Discrete SCRs, and Stack