The TPQDR3914 Three Phase dv/dt Reactor from Global EMC solutions provider EMIS is a specially designed inductor installed at the output of a Variable Frequency Drive (VFD) or inverter to limit the rate of voltage rise (dv/dt) generated by PWM switching, reducing voltage stress and protecting motor insulation.
Modern VFDs use fast IGBTs that can create high dv/dt, voltage reflections (especially with long motor cables), increased bearing currents and EMI. Installation of a dv/dt reactor helps prevent premature motor failure, nuisance power tripping and mitigates EMI.
Designed for 0.8% impedance the reactor provides effective protection while causing a very low voltage drop and minimal power loss. The TPQDR3914 will operate reliably with modern high-frequency PWM drives, with current ratings from 4 A to 500 A. It reduces motor insulation stress, bearing currents, and the risk of premature motor failure while minimizing reflected wave effects in long motor cables.
- Typical applications include
Variable Frequency Drives: dv/dt reactors limit the voltage rise from PWM outputs protecting motors from insulation stress and reducing high frequency transients - Pumps: smooth voltage transients from dv/dt reactors prevent insulation and bearing damage in continuously running motors
- Fans and Blowers: Reduce motor voltage spikes and acoustic noise caused by fast switching in VFD driven fans and blowers
- Compressors: Mitigate high dv/dt and reflected voltage peaks that can degrade motor windings under heavy mechanical load
- Conveyors: Protects conveyor motors from insulation stress during frequent starts/stops and rapid speed changes
- HVAC Systems: Reduce electrical stress on motors in air-handling units, chillers and fans improving system reliability
- Long Motor Cables: Limit voltage overshoot and reflections that occur over extended cable runs protecting insulation and motor life
- Three-phase induction motors and old motors not designed for inverter duty
EMIS aims to offer an end-to-end solution to meet industry’s ongoing EMI Challenges. With a robust global supply footprint across eight industry segments, EMIS is continuously investing in technology and skills to deliver its promise of efficiency with seamless customer support.
EMI Solutions has been designing and manufacturing EMI filters for more than 40 years and is a global source for efficient EMI and EMC solutions across all industries, applications and the frequency spectrum. Products available include EMI/EMC Components, Feedthrough Components, Power Quality, Military Grade Filters and Surge Protection.
Customers are supported by a very experienced consulting team, a fully equipped Pre-Compliance Lab and a huge safety certified standard product offering of over 2500 part-numbers produced in their own very efficient facility.
For more information call +46 8 54 40 30 00, or email sales-eu@eu.emisglobal.com or visit https://emisglobal.com/
About EMI Solutions (EMIS):
Has been designing and manufacturing EMI filters for more than 40 years and is a global source for efficient EMI and EMC solutions across all industries, applications and the frequency spectrum. With a robust global supply footprint across eight industry segments, EMIS is continuously investing in technology and skills to deliver its promise of efficiency with seamless customer support.
