Tomberlin 2010 E-Merge - Electric Motor Overview and Inspection; Motor Electrical Circuit Checks

Electric Motor
MERGE 12-1
Chapter 12
Overview
The electric vehicle is provided with a 48V DC separately excited reversible traction motor. The
separately excited motor can only be used on the E-merge electric vehicles. TOMBERLIN suggests that
the electric motor that is in a bad state of repair should be sent to the special service store for repair. The
technician who has knowledge and expertise about the service of the electric motor can perform some
simple reparation.
Exterior inspection of the electric motor
Perform the following inspections and tests with the multimeter or circuit breaker without the need to
disassemble the electric motor.
NOTE: Before disconnection, label the wires of the electric motor for easy identification.
Check Procedure 1－internal short circuit
Please refer to Chapter 1 "Safety Protection Measures".
1. Disconnect the battery cable as specified. Please refer to Chapter 1 "Protection for Electrical
Safety".
2. Hold the terminals with two spanners, and disconnect the wire from the connecting terminal of the
electric motor.
3. Attach the black probe（－）of the multimeter set at 200Ω（ohm） to the motor enclosure. Scrape
off the paint on the motor cover to ensure good connection. Attach the red probe（＋） to the
terminals of A1，A2，F1 and F2 separately (see Fig 12-1). The multimeter shows not-connected. In
case of conducting state, the electric motor should be removed from the electric vehicle and be
repaired by professionals. Please refer to Chapter 9 "Removal of Motor".
3.1 The wrong readings on A1 or A2 terminals may imply three kinds of problems: A1 or A2
grounding, grounding of wires in the electric brush area or armature/commutator grounding.
The wrong reading on F1 or F2 terminals mean F1 or F2 terminal grounding or excitation coil
grounding.
Check Procedure 2－disconnection of armature circuit
Please refer to Chapter 1 "Safety Protection Measures".
1. Disconnect the battery cable as specified. Please refer to Chapter 1 "Protection for Electrical
Safety".
2. Hold the terminals with two spanners, and disconnect the wire from the A1 and A2 connecting
terminals of the electric motor. Attach the red probe （＋） of the multimeter set at 200Ω（ohm） to
A1 and the black probe（－）to the A2 terminal. The multimeter should indicate connected. In case