Skip to content

Latest commit

 

History

History
71 lines (55 loc) · 2.7 KB

IMMD general.md

File metadata and controls

71 lines (55 loc) · 2.7 KB

In this document, general information related to IMMD concept will be compiled such as; advantages, disadvantages, challenges, applications etc.

Problems with conventional drives

  • Increased footprint (cabinet)
  • Increased volume and weight
  • Long cable effect: Aging of stator induclation layers
  • Reqires filters for long cable effect

Long cable effect:

Piggybacked Integration

  • Servo, BLDC, induction, stepper
  • Can communicate. Control of multiple distributed motors.
  • Lenze can be controlled by smartphone.
  • Simple data collection and diagnoses.
  • Reduced installation space
  • Reduced length of power cables

Piggybacked design (physically mounted on top of the motor):

Segmented Drive

  • The stress on each module is reduced
  • The motor drive has a round shape, can be mounted on the back side of the motor
  • More compact than piggybacked

Matrix motor:

  • Semiconductor switches can be mounted around the motor.
  • Switches are used for online reconfiguration of the motor.

IMMD with Modular stator

  • Motor is modularized and segmented
  • Stator piece that has a concentrated coil winding ?
  • Power converter dedicated to the stator piece and corresponding gate drivers

Advantages of IMMD

  • Without the transmission cable, EMI and long cable effect are greatly attenuated.
  • Extra expense of power connecters and power cables are reduced.
  • Cost of IMMD is reduced due to modular design.
  • Fabrication cost is reduced due to the mass production of smaller converter modules.
  • Maintenance is also less expensive because when IMMD fails, only the broken module needs to be replaced.
  • Thermal performance is better. Several IMMD modules share the same total power but semiconductor devices are spread out with larger surface area per volume.
  • Hot spot temperature of IMMD is reduced.
  • Fault tolerance is better because the

Challenges of IMMD

  • The motor temperature can be too high and damage the power devices.
  • Bulky capacitors take a large volume, which will inevitably increase the size and weight of IMMD.
  • Physical vibration.
  • To simply cut the PCB into a round shape is not an effective way.
  • Requires optimal placement of components.

Solutions Proposed

  • Capacitor size reduction, better efficiency and easier thermal management with GaN.
  • Reduced voltage stress on capacitor and device with multilevel converter (MLC).
  • Reduced loss and cost of devices with reduced voltage rating (MLC).

Generations of IMMD PCB design