requirements to passive components in drives
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Requirements to passive components in drivesNiels Gade, Danfoss Drives A/S
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Passive components in intermediate circuits
• DC-Inductor:
• Reduce line side harmonics
• Reduce voltage ripple
• Accept peak current without saturation
• DC-field bias with PM to shrink size
• DC-capacitor:
• Provide energy storage
• Deliver ripple current to inverter
• Lifetime:
• Losses (ESR and ripple current)
• Temperature
• Humidity
• Future requirements: • Voltage (electrolytic)
• ESR/ripple current (electrolytic)
• Energy density (film)
• Humidity (film)
DC-link filter
ESL ESRC
Capacitor equivalent circuit
Normal and DC-biased core Electrolytic capacitor
“slim” DC-link
Film capacitor
Variable speed drive
DC-biased core
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Motor integrated Solutions
• Low loss / high power density
• Harsh environment
• Temperature
• Vibration
• Humidity
• Limited space:
• Odd shape solutions
• Inductors
• Integration with stator laminations
• SMCs or sintered powder cores
• Capacitors
• Energy density and robustness
• Loss dissipation (thermal mgt.)
• Alternative topologies:• CSI vs VSI
Soft Magnetic Composite cores (arbitrary shape)
Integration of motor and drive
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Ultra compact sinusoidal drives
• Ultra compact solution:
• High power density Low loss
• Small filters high frequency switching
• Low loss and high frequency:
• WBG active components
• Cores: High frequency, low loss, high permeability
• Powders / SMCs / ferrites
• Windings: Low loss, low cost
• Al versus Cu
• Capacitors: Integration in power modules
• Designs: Careful control of parasitic elements in layouts
L2L1
C1
L f
C f
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