Download EE 477 Final Report

ECE 477 Final Report
Fall 2008
Table G.4: Motor Control
Failure
No.
Failure
Mode
Possible Causes
Failure Effects
Method of
Detection
Criticality
Remark
D1
Cannot
control motor
Gate driver may
have burned up
Motor stops operating
Observation
Medium
Would cause motor
to coast to a stop
D2
High side gate
not switching
Bootstrap
capacitor/diode
failure
Motor stops operating
Oscilloscope
Medium
Causes motor
windings to be
shorted
D3
No power to
gate driver
Bypass
capacitor shorts
Motor stops operating
DMM
Medium
D4*
High side
IGBT switch
stuck closed
Excessive
current draw
Motor speeds up out of
control
DMM
High
G-3
Can cause serious
injury to rider