Electric Motor

Motatest 1 Multi-Function Tester for Electric Motors

The Motatest 1 is an all-purpose tester for testing electric motors and products with windings. It combines ten different test methods in one user-friendly and very mobile device. The combination of the test methods, its very compact desgin as well as the battery operation makes the Motatest an ideal tool for on-site service applications - especially at very difficult installation situations.

For testing a three-phase motor the three winding connections as well as the motor frame are connected to the tester. Afterwards the Motatest analyses fully automatically the motor via surge voltage and resistance test. After this the motor is also tested with a high-voltage test to evaluate the quality of the motor fast and clearly. Special software is supplied as standard to install on a PC so that reports can be printed and saved

The following testing methods are integrated into the tester:

  1. Surge Test. For the surge test, the Motatest 1 generates surge waves via a low voltage, high frequency signal. Through the automatic surge voltage comparison of the windings, it is possible to make accurate statements regarding the symmetry of windings. Inter-turn or phase faults inside the winding would cause a great asymmetry of the surge curves. The surge waves are displayed graphically and, via our mathematical analysis, automatically evaluated "good/bad". It is a very safe test method and doesn't require any special knowledge by the operator. The surge test can be used not only for testing the coils of a stator between themselves, but also for comparing to a reference stator that has been recorded and saved into the tester previously. With this feature, the Motatest is therefore suitable for small-lot production. +/- 12V voltage range.
  2. Resistance test. The resistance test is executed with a high test current either 1-phase, 2-phase or automatically 3-phase. The test is executed in 4-wire configuration. If necessary, the resistances can be calculated to 20 degrees ambient temperature with an optional ambient temperature compensation probe. 0.001Ω ... 499KΩ / accuracy ±0.3%. test current: max. 1.4A
  3. PE/GB Resistance Test. The PE/GB-resistance test can be used e.g. for "testing repaired devices" according to VDE standards VDE 0701-0702. The two test leads are connected to the earth circuit to be tested, the resistance is measured, the poles of the test leads are reversed and measured again. The worst of the two resistance-measurement values is the PE/GB resistance. A VDE button facilitates setting the VDE test parameters to default values. 0.01 Ω – 1 Ω
  4. High-voltage test DC, 0-4000V max 3mA. For the high-voltage or insulation-resistance and PI test, the Motatest generates a regulated and stable DC test voltage. This offers a very interesting alternative to a high-voltage AC test to detect insulation faults (phase-to-phase short circuits or short circuits to frame). Although this test method cannot replace the VDE-compliant final AC high-voltage test, it is possible to make clear statements about the quality of the winding system.
  5. PI (polarization index) or DAR test. For the PI or DAR test, the high voltage is connected to the motor/stator and then the test process is started. Based on the current at the beginning and at the end of the test, the tester automatically determines the polarization index or the DAR. The complete test is performed automatically.  0 – 4000 V DC with automatic timing and automatic calculation
  6. Insulation Resistance 0-4000V DC automatic with programmable voltage adjustment. 1 MΩ – 99 GΩ . The insulation-resistance test can be used for "testing repaired devices" according to VDE standards VDE0701-702. A VDE button facilitates setting the VDE test parameters. In addition, this test can be used to determine the insulation quality and the age of the unit.
  7. Induction/turn to turn (growler) test. By means of additional, optional test probes, stators and armatures can also be tested with the "classical" test method. For this purpose, the core is contacted with the test probe. Then the measuring signal at this test point is stored. Now, the operator moves the test probe manually around the motor or stator. The highly sensitive Motatest indicates the deviation from the previously stored reference signal graphically and stores the information digitally
  8. Neutral Zone test for DC motors. To adjust the neutral zone at DC motors, the field and the armature (the carbon brushes) are connected to the Motatest. Now, the Motatest indicates the deviation to the neutral zone graphically and digitally. The motor is adjusted by turning the brushes. Requires optional additional leads.
  9. Sense of Rotation test of the rotary field. For detecting the rotation direction of a stator.  A Hall probe is inserted into the stator and a low field voltage applied to the stator. The Motatest then shows the direction of rotation. Requires optional additional probe.
  10. Sense of Rotation for an assembled motor. A special connection lead is used to detect the sense of rotation of the motor. The voltage-free, assembled and wired three-phase motor (squirrel-cage rotor) is connected to the tester and then the motor shaft is turned by hand. The Motatest then shows the direction of rotation. Requires optional additional probe.
  11. Auto Mode. A very useful test. Simply connect the three phases and the earth to the tester and press Start. Automatically the tester will run the resistance and surge tester and give an automatic pass/fail for each test and each phase. Connect once to run all of the tests.