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medium-frequency direct current system

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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005559
EISBN: 978-1-62708-174-0
... Abstract This article provides an overview of the components of a resistance welding machine. It focuses on the single-phase control system and medium-frequency direct current system of resistance welding. The article also includes information on their feedback systems, rectification systems...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005196
EISBN: 978-1-62708-187-0
...-frequency power supplies. The advantage of medium frequency is that the power density of the furnace system can be increased substantially without increasing its size. Much more melting power can be applied, while maintaining the stirring action at desirable levels. Heat losses, which are a function...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003200
EISBN: 978-1-62708-199-3
... Combination Progressive-Spinning Method Power Supplies Basic Designs Coil Coolants Basic Systems for Quenching Applications Line-Frequency Power Supplies Medium-Frequency Motor-Generator Units Medium-Frequency Solid-State Units Radio Frequency (RF) Vacuum Tube Units...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005846
EISBN: 978-1-62708-167-2
... convection is sufficient to maintain a satisfactory temperature provided the atmosphere is at a temperature low enough to remove heat and the magnetic core is not continuously exposed to direct radiation from a hot part. For medium frequencies and power densities, the most common method to remove heat...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005924
EISBN: 978-1-62708-166-5
... using low-turn work coils. From the 1940s through the 1950s, the use and application of large motor generators and radio-frequency (RF) oscillator induction power supplies continued. In the 1960s, solid-state power supplies were invented for the conversion of line frequency into medium-frequency...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005869
EISBN: 978-1-62708-167-2
... for a high-frequency heating sequence Time, ms High-frequency power Medium-frequency power High-frequency current Medium-frequency current High frequency, kHz Medium frequency, kHz 0 0 0 0 0 0 0 10 0 0 0 0 90 0 20 4 0 66 0 285 0 30 4 0 83 0 285 0 40 4 0...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005895
EISBN: 978-1-62708-167-2
... of a medium-frequency induction crucible furnace The magnetic flux generated by the coil current runs partly through the melt, although the greatest part flows through the crucible wall between the coil and the melt. The exterior transformer yokes form a magnetic return path and thereby guide the outer...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005899
EISBN: 978-1-62708-167-2
... in Fig. 15(b) . The converter first has a rectifier that is connected to the furnace transformer and that converts the line frequency into direct voltage/current. The following inverter then generates the desired medium frequency from this. The current fed in by the converter oscillates...
Series: ASM Handbook
Volume: 17
Publisher: ASM International