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induction heating power supplies

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220047
EISBN: 978-1-62708-341-6
... addresses the selection of power supplies in terms of these two factors as well as the operational features of different types of sources. The six different types of power supplies for induction heating applications covered in this chapter are line-frequency supplies, frequency multipliers, motor-generators...
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Published: 01 June 1988
Fig. 1.1 Conversion efficiency of induction heating power supplies. From R. W. Sundeen, Proceedings, 39th Electric Furnace Conference , Houston, TX, AIME, New York, 1982, p. 8 ( Ref 1 ) More
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Published: 01 June 1988
Fig. 1.2 Change in cost of induction heating power supplies since 1948. From R. W. Sundeen, Proceedings, 39th Electric Furnace Conference , Houston, TX, AIME, New York, 1982, p. 8 ( Ref 1 ) More
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Published: 01 June 1988
Fig. 3.8 Schematic illustration of a capacitor bank used in tuning induction heating circuits for low- and medium-frequency induction heating power supplies. From C. A. Tudbury, Basics of Induction Heating , Vol 2, John F. Rider, Inc., New York, 1960 ( Ref 2 ) More
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Published: 01 August 2015
Fig. 3.2 Induction heat-treat power supply basic diagram. ac: alternating current; dc: direct current. Source: Ref 2 More
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Published: 01 June 1988
Fig. 3.9 Vector diagram illustrating power-factor correction for a fixed-frequency induction heating power supply More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220077
EISBN: 978-1-62708-341-6
... Abstract This chapter describes two types of auxiliary equipment required in most induction heating installations: cooling systems and device timers. Water- and vapor-based systems used for cooling the power supply and the induction coil are described. The chapter concludes with a brief...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220001
EISBN: 978-1-62708-341-6
... currents dissipate energy and bring about heating. The basic components of an induction heating system are an induction coil, an alternating-current (ac) power supply, and the workpiece itself. The coil, which may take different shapes depending on the required heating pattern, is connected to the power...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220027
EISBN: 978-1-62708-341-6
... Abstract This chapter focuses on the transfer of energy between the power supply and the induction heating coil. The most efficient transfer requires that the induction heated load and coil be matched to the power supply and that the electrical circuit containing these elements be properly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050001
EISBN: 978-1-62708-311-9
... to melt metals. Induction heat treating came into prominence in the 1930s, when high-frequency motor-generator sets were developed and used for the induction hardening of crankshaft journals and bearings. In 1938, Caterpillar installed a power supply for induction hardening track links, and by 1943...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050025
EISBN: 978-1-62708-311-9
... Abstract This chapter discusses the basic components in an induction heat treating system. It describes the design and operating characteristics of power supplies, load-matching transformers, tuning capacitors, power regulators, controllers, process monitors, and diagnostic systems. It also...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440159
EISBN: 978-1-62708-262-4
... is not being heated; the motor generator uses a significant amount of power when not heating a workpiece. Medium-frequency power supplies using solid-state frequency conversions make up the vast majority of induction heating power supplies in use today. These systems have largely replaced motor-generator...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050009
EISBN: 978-1-62708-311-9
...,” in this book. Accordingly, the theory of induction heating was researched so that motors and transformers could be built for maximum efficiency by minimizing heating loss. The development of high-frequency induction power supplies provided a means of using induction heating for surface hardening. The early use...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220281
EISBN: 978-1-62708-341-6
... by flexible leads and brushes to a length of buswork which in turn is connected to an induction heating power supply. The metallic parts contained in the tube are induction heated to 850 °C (1560 °F) as it travels through the oven, and the entrapped oxygen is driven off. When the tube exits the oven...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050215
EISBN: 978-1-62708-311-9
... hardening), and the size and geometry of the part. The frequency and power supplies commonly used in the induction hardening of steel are listed in Table 11.1 . The lower frequencies are more suitable as the size of the part and the case depth increases. However, because power density and heating time...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050191
EISBN: 978-1-62708-311-9
..., the workpiece is moved into the induction-tempering part of the heat-treating line. Again, a fiber-optic sensor senses the presence of the workpiece and begins the heating cycle, generally using a lower-frequency power supply (lower frequency can be used because the workpiece is still magnetic during tempering...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050263
EISBN: 978-1-62708-311-9
... cycle time Increase power output of induction power supply Improve coil design Improve output bus design to increase efficiency Carbon % too low Obtain variance for lower hardness that is produced Carbon restore or carburize surface Scrap parts Poor prior microstructure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220085
EISBN: 978-1-62708-341-6
... of air gap between coil and bar, and induction power-supply frequency: (a) 60 Hz and 1 kHz. From G. F. Bobert, “Innovative Induction Systems for the Steel Industry,” Proc. Energy Seminar/Workshop on New Concepts in Energy Conservation and Productivity Improvement for Industrial Heat Processing Equipment...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050293
EISBN: 978-1-62708-311-9
... Abstract This chapter discusses the maintenance needs of major components in induction heat-treating systems, including power supplies, heat stations, capacitors, high-frequency output stages, induction coils, water systems, quench systems, and fixturing. induction heating systems...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220009
EISBN: 978-1-62708-341-6
... which underlie induction heating are best understood with reference to the interactions between the coil and the workpiece; the role of the power supply in this case is taken into account only in terms of the frequency and magnitude of the ac current which it supplies to the coil. By this means...