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Featured Products 

SEPTA has integrated the following Diagnostic Systems:

Traction Motor Diagnostic System       

Traction Motor 

The Southeastern Pennsylvania Transportation Authority (SEPTA) intagrated a Traction Motor Diagnostic System (TMDS) in February of 1997, which has since then proven to be an invaluable tool. Not only have SEPTA engineers been able to ensure that only reliable motors are placed in service, but they have also been able to evaluate individual motor components, prefect assembly methods and qualify outside suppliers. For a complete description of the operation of a TMDS refer the TMDS Section.


Type: Fully automated, AC & DC motor test capability
Dynamometer: Eddy-current, water cooled, 275 horsepower
AC power supply: 3 phase, 0-600 volt, 250 amp, 60 Hz
Armature power supply: 0-750 volt, 300 amp
Field power supply: 0-50 volt, 750 amp

If you would like to review the entire specification, request this specification using the document request form.

About the Product

American Railway Technologies designed, built, delivered and installed the system shown below.

The Regulator section, which is located in a remote location, provides the electric power for testing motors.

The control section, which is located outside the test cell, includes the computer, monitor, keyboard, printer and dynamometer controller.

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Regulator Section

Control Section

The motor test frame is located in a separate test cell. Note the double-doors with sound insulation. The roof of this test cell can be opened in order to lower motors onto the test frame using an overhead crane, and then the straps are used to secure the motor. Steel motor mounts (not visible) are used in conjunction with these straps to ensure safe testing. As shown below there are also magnetic probes placed on the motor in order to measure temperature and vibration.

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Control Section and Test Cell

Overhead view of Test Cell

Rectifier Section and Test Frame

In order to allow testing of motors of different diameters, the motor test frame features a motorized motor mounting table.  The table also comes with guide pins on the corners of the table for easier installation of motors. Note the plumbing on the rear wall of the test cell, this plumbing is part of the heat exchanger system. Also part of the heat exchanger system is the water-to-water heat exchanger mounted on this wall. Note the power terminals mounted on the end of the table.

The motor is connected to the dynamometer via a heavy-duty, double universal joint, telescopic drive shaft. The drive shaft is contained by a hinged cover in the case of failure. The hinged cover is shown open in this picture. Note the containment V-blocks surrounding the drive shaft and raise/lower buttons to adjust the motor table height.

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Motor Test Table

Drive Shaft and Dynamometer

The air-to-water heat exchanger, used to cool the dynamometer, is located outside the shop. This is a three-fan unit installed on eight 6-inch footings for stability. Note the pipes going into side of the building. These pipes go to the test cell where the coolant tank and pump are located.

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Heat Exchanger

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