Download as PDF, PPTX
Uploaded byFluxtrol Inc.
Optimal Design of Internal Induction Coils
This document discusses the optimal design of internal induction coils for surface heating. It examines different coil designs like the inductor with central rod, hairpin, single-turn cylindrical, and multi-turn cylindrical coils. The study compares the performance of coils with and without magnetic cores and return legs. It finds that magnetic flux controllers with cores and poles drastically improve coil performance by increasing efficiency and power factor. While return legs only introduce small losses, they can cause significant voltage drops. Proper design of the magnetic core is essential for optimal coil induction heating performance.
More Related Content
Similar to Optimal Design of Internal Induction Coils
Optimal Design of Internal Induction Coils
- 1. Optimal Design ofInternal Induction Coils Dr. Valentin Nemkov Eng. Robert Goldstein Dr. Vladimir Bukanin
- 2. Types of Inductorsfor Internal Surface Heating (ID Coils) • Inductor with Central Rod • Hairpin • Single Turn Cylindrical • Multi-Turn Cylindrical
- 3. Inductor with Hairpin Central Rod Inductor
- 4.
- 5.
- 6. Pipe ID Heating Lw= 5.6 cm Lw = 3.0 cm
- 7. Case Study Conditions •Pipe – Non-magnetic Stainless Steel – ID = 5.6 cm, OD = 6.9 cm, length = 3.0 cm (short) or 5.6 cm (long) • Coil – 4 turns 6.4 cm square copper tubing – Concentrator Fluxtrol 50 vs. Air • CS Program Flux 2D – Does Not Include Return Leg • Frequency 10 kHz
- 8. Results of Study Partlength Core Pole U I ΔPc Psteel Ptotal η cosφ S 55.9 mm y y 33.6 900 1685 8837 10522 84.0% 0.348 30240 55.9 mm y n 32.3 1190 2512 8878 11390 77.9% 0.296 38437 55.9 mm n n 32.9 2000 4168 9285 13453 69.0% 0.204 65800 30 mm y y 30.9 790 1242 8126 9368 86.7% 0.384 24411 30 mm n n 30.2 1760 3179 8282 11461 72.3% 0.216 53152 Results do not consider return leg
- 9. Case Study ofMagnetic Core Design • Pipe – Non-magnetic Stainless Steel • Coil – 4 turns 6.4 cm square copper tubing – Concentrator Fluxtrol 50 vs. Air • CS Program ELTA – Takes into account whole circuitry • Frequency 10 kHz
- 13. Influence of ReturnLeg Case Core Core Uind Iind Pind η cosφ Sind Ugen Gap (mm) (V) (A) (kW) (kVA) (V) 1 No NA 132 1350 34 55% 0.19 178 480 2 Yes 0 220 568 25.4 77% 0.22 125 760 3 Yes 1 138 570 25.4 77% 0.36 78 460 Coil Head Voltage 85 V for All Cases
- 14. Conclusions • Magnetic FluxControllers Drastically Improve ID Coil Performance • Magnetic Flux Controller Should Consist of a Core and Poles for Optimal Performance • Losses in Return Leg are Usually Small • Voltage Drop due to Return Leg May Be High • Proper Design of Magnetic Core Essential for Optimal Performance • ID Coil Parameters May Be Found Quickly and Accurately Using ELTA Program