EMI and EMC Aspects of a Brushless Repulsion Motor/Drive - PowerPoint PPT Presentation

1 / 30
About This Presentation
Title:

EMI and EMC Aspects of a Brushless Repulsion Motor/Drive

Description:

Hi-Frequency Common-Mode current paths. 2004 SMMA. 6 ... The adjustable speed brushless repulsion motor eliminates the need for high ... – PowerPoint PPT presentation

Number of Views:272
Avg rating:3.0/5.0
Slides: 31
Provided by: robert927
Category:

less

Transcript and Presenter's Notes

Title: EMI and EMC Aspects of a Brushless Repulsion Motor/Drive


1
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
  • Presented by DynaMotors, Inc.

2
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
  • Background
  • Inverters that drive induction motors, brushless
    dc motors and switched reluctance motors can
    produce EMI and cause EMC problems.

3
Typical PWM Motor Drive Inverter
4
EMI and EMC Aspects of a Brushless Repulsion
Motor/drive
  • Background
  • Inverters that drive induction motors, brushless
    dc motors and switched reluctance motors can
    produce EMI and cause EMC problems.
  • Cabling between drive inverters and motors can
    conduct common-mode energy to the motor stator
    windings which might cause damaging bearing
    currents.

5
Hi-Frequency Common-Mode current paths
6
EMI and EMC Aspects of a Brushless Repulsion
Motor/drive
  • Background
  • Inverters that drive induction motors, brushless
    dc motors and switched reluctance motors can
    produce EMI and cause EMC problems.
  • Cabling between drive inverters and motors can
    conduct common-mode energy the motor stator
    windings which might cause damaging bearing
    currents.
  • Long cables between the drive inverter and the
    motor may set up standing voltage waves that
    reduce the motor insulation life.

7
EMI and EMC Aspects of a Brushless Repulsion
Motor/drive
  • Background
  • Inverters that drive induction motors, brushless
    dc motors and switched reluctance motors can
    produce EMI and cause EMC problems.
  • Cabling between drive inverters and motors can
    conduct common-mode energy the motor stator
    windings which might cause damaging bearing
    currents.
  • Long cables between the drive inverter and the
    motor may set up standing voltage waves that
    reduce the motor insulation life.
  • Filters added to drive inverters designed to
    reduce or eliminate the above problems must carry
    the motor rated current.

8
Typical filter add-ons used with drive inverters
9
EMI and EMC Aspects of a Brushless Repulsion
Motor/drive
  • Background
  • Inverters that drive induction motors, brushless
    dc motors and switched reluctance motors can
    produce EMI and cause EMC problems.
  • Cabling between drive inverters and motors can
    conduct common-mode energy the motor stator
    windings which might cause damaging bearing
    currents.
  • Long cables between the drive inverter and the
    motor may set up standing voltage waves that
    reduce the motor insulation life.
  • Filters added to drive inverters to reduce the
    above problems must carry the motor rated
    current.
  • Shielded cables are often needed to reduce EMI.

10
Solutions to the EMI and EMC problem
  • Ways to minimize the EMI and EMC problem
  • Use only linear (sine-wave) drives for
    adjustable-speed motors

11
Solutions to the EMI and EMC problem
  • Ways to minimize the EMI and EMC problem
  • Use only linear (sine-wave) drives for
    adjustable-speed motors
  • Add shielded cabling

12
Solutions to the EMI and EMC problem
  • Ways to minimize the EMI and EMC problem
  • Use only linear (sine-wave) drives for
    adjustable-speed
  • Add shielded cabling
  • Use very high-frequency carrier PWM drives
    (100-200kHz) with filtered outputs and perfectly
    shielded and grounded enclosures

13
Solutions to the EMI and EMC problem
  • Ways to minimize the EMI and EMC problem
  • Use only linear (sine-wave) drives for
    adjustable-speed
  • Add shielded cabling
  • Use very high-frequency carrier PWM drives
    (100-200kHz) with filtered outputs and perfectly
    shielded and grounded enclosures
  • Build the drive into the motor still needs
    output and input filters to limit bearing
    currents but does help reduce EMI caused by drive
    to motor cables.

14
Solutions to the EMI and EMC problem
  • Ways to minimize the EMI and EMC problem
  • Use only linear (sine-wave) drives for
    adjustable-speed
  • Add shielded cabling
  • Use very high-frequency carrier PWM drives
    (100-200kHz) with filtered outputs and perfectly
    shielded and grounded enclosures
  • Build the drive into the motor still needs
    output and input filters to limit bearing
    currents but does help reduce EMI caused by drive
    to motor cables.
  • Use a brushless repulsion motor.

15
48 Frame 4-pole 1/2HP HVAC Brushless Repulsion
Motor with Integrated Drive Control
16
Construction of a Brushless Repulsion Motor
17
Simplified image of a Brushless Repulsion Motor
  • Armature coil is open
  • Armature coil is shorted

18
Flux pattern in 4-pole Brushless Repulsion Motor
19
Coil Switch side of 48 Frame HVAC Motor PC Board
(Mounted on armature shaft)
20
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
  • Radiated and Conducted Noise Measurements on the
    48 frame HVAC Motor
  • Radiated standards were FCC Class A 3m and CE
    standard EN55022 Class A 3m
  • Both the horizontal and vertical planes were
    measured in the tests
  • Conducted noise standard was EN55022 Class A

21
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
22
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
23
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
24
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
25
EMI and EMC Aspects of a Brushless Repulsion Motor
26
EMI and EMC Aspects of a Brushless Repulsion Motor
  • Conclusions
  • The adjustable speed brushless repulsion motor
    eliminates the need for high frequency PWM drive
    inverters that produce radiated and conducted
    energy and high frequency common-mode currents
    that might damage bearings.

27
EMI and EMC Aspects of a Brushless Repulsion Motor
  • Conclusions
  • The adjustable speed brushless repulsion motor
    eliminates the need for high frequency PWM drive
    inverters that produce radiated and conducted
    energy and high frequency common-mode currents
    that might damage bearings.
  • The problem of common-mode currents is eliminated
    because all the switching is done in a closed
    space on the armature.

28
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
  • Conclusions
  • The adjustable speed brushless repulsion motor
    eliminates the need for high frequency PWM drive
    inverters that produce radiated and conducted
    energy and high frequency common-mode currents
    that might damage bearings.
  • The problem of common-mode currents is eliminated
    because all the switching is done in a closed
    space on the armature.
  • The filtering requirement for the input power
    line is eliminated.

29
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
  • Conclusions
  • The adjustable speed brushless repulsion motor
    eliminates the need for high frequency PWM drive
    inverters that produce radiated and conducted
    energy and high frequency common-mode currents
    that might damage bearings.
  • The problem of common-mode currents is eliminated
    because all the switching is done in a closed
    space on the armature.
  • The filtering requirement for the input power
    line is reduced.
  • No filtering is needed for the space between the
    controller and the armature.

30
EMI and EMC Aspects of a Brushless Repulsion
Motor/Drive
  • Thankyou
  • Your Questions Please
  • Presented by DynaMotors, Inc.
Write a Comment
User Comments (0)
About PowerShow.com