Our analysis of axiomatic design is based on linear-variant magnetic field weakening method. We can define the steps from the content from design methodology. First is to identify customer needs, for this case, the ultimate goals for research. Next is to organize functional requirements in hierarchy what the product must achieve. Then we should map these in design parameters to same hierarchy.

Customer Needs

• CN1: Enhance the quality of motor by using mechanical field weakening method

• CN2: Require robust control, accurate control

• CN3: Require high sustainability

Hierarchy of Functional Requirements

• FR1: Change the magnetic flux passing through the coil

  • FR1.1: Change the position of a stator

• FR2: Provide accurate movement or robust condition of each component

  • FR2.1: Provide smooth rotation of a rotor

  • FR2.2: Reset position of a stator

  • FR2.3: Minimize gauge pressure between inside & outside of a motor when rotation

• FR3: Provide parts in assembly

  • FR3.1: Connect or join all the parts of a BLDC motor

  • FR3.2: Provide parts to assemble with stepper motor

Hierarchy of Design Parameters

• DP1: Mechanism to change magnetic flux

  • DP1.1: Stator-shifting mechanism

• DP2: Assistant components or designs

  • DP2.1: Slide Bearing

  • DP2.2: Stepper motor

  • DP2.3: Air hole of motor cover

• DP3: Assembly Parts

  • DP3.1: Motor shaft

  • DP3.2 Cover (body, cap)

Design Constraints

• C1: The movement of stator must not exceed certain range.

• C2: The total size or mass of the motor must be appliable to hand robot.

• C3: The force of the spring must be able to fix stator, but not affect the linear transition of stator

QFD- House of Quality

Mapping CNs and FRs