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Motor Exercise

Week 4

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• A customer needs a new electric circuit to drive electrical motors. It has been decided to buy this assembly from a subcontractor.

• Apply the appropriate Six Sigma tools to develop a circuit that controls the motor speed (rpm).

• Your goal is to design a circuit that produces a propeller rpm that meets the following customer requirements:

• Constant rpm → minimized variation

• Slow rpm → the slower the better

• You have a customer meeting to present your results in a power point presentation. The customer will than decide which subcontractor get the contract.

• The meeting is scheduled for Friday at 10:00 o’clock.

Assignment

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System Schematic

Key characteristic: RPM of the Motor

Subassembly1

Subassembly2

Subassembly3

Power in RPM

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•R 1 must be purchased from supplier G•R 2 can be purchased from supplier A or B

Resistor R 1

Resistor R 2

Subassembly 1

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•R3 and R4 can be purchased from either supplier C or D but both must be purchased from the same supplier.

Resistor R3 Resistor R4

Subassembly 2

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•The motor assembly can be purchased from either supplier E or F

Subassembly 3, the Motor Assembly

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Voltage: 4 x 1,5V

R1: Supplier G

R2: Supplier A or B

R3 and 4: Supplier C or D

Motor: Supplier E or F

Assembly Overview

R1 R2

R3R4

M

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• You have to follow the schematic on page 7. No changes allowed!

• The power is provided by 4 AA batteries!

• Your available measurement systems are the multi-meter and the tachometer provided!

• It is not allowed to tamper with the variable resistors!

• Speed 0 is not acceptable !!

Additional Rules

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• What specification to you offer to your customer?

• Which supplier you selected for each subassembly?

• What is the reason for your decision?

• What specification did you agree with your suppliers?

• What tools did you use?

• What is the effect for of each subassembly on the speed mean (rpm) and the variation?

• What are your possibilities if the customer is not satisfied with the specification your offered?

• List any important assumptions.

If you get the contract your are in the position to deliver yournew application which may result in additional business.

All your Black Belts are present and reports!

Answer the Following at the Meeting