The Dynamic-MotorAnalyzer combines precision and convenience: the measurement module and analysis software are compactly built-in a robust measurement case – ready for use directly on your electric Motor.

It often happens that electric motors are overloaded during operation or fail for unexplained reasons. This can be due to the supply network, the electric motor itself, or its load. The cause of failure can be electrical or mechanical.

The cause of failure is often difficult to pinpoint, as the electric motor is frequently part of a complex machine or installed in an inaccessible system. However, the electric motor supply line in the electric motor control cabinet is usually more accessible. Here, the 6 electrical quantities (3 x U and 3 x I) can be measured directly. From these, the Dynamic-MotorAnalyzer determines the 'condition' of your electric motor using various analysis methods.

The Dynamic MotorAnalyzer offers automatic phase correction. If you have connected a phase with incorrect polarity or twisted, you do not need to disconnect and reconnect the measurement lead. The Dynamic MotorAnalyzer checks the connection and adjusts accordingly.

The Dynamic-MotorAnalyzer features additional analog and digital inputs. These can be quickly and easily configured via software for a wide range of measurement signals. Thus, in addition to electrical quantities, electric motor temperatures, oscillations, flow rates, or pressures on pumps can be easily measured and evaluated. The goal is to provide the operator with the most complete overall picture of the machine possible.

Dynamic electric motor analysis and its capabilities

The electric motor is supplied with three-phase current by the energy supplier or a frequency converter. The three phase voltages must meet certain conditions for the electric motor to operate correctly and within its specifications. Larger deviations lead to an incorrect operating state of the electric motor, which typically results in overheating.

The electric motor draws current depending on the grid, its quality, and the load conditions. The current contains a wealth of information that the Dynamic-MotorAnalyzer evaluates. This makes it possible to determine the rotational speed or investigate rotor problems.

Voltage and current combined yield the power consumed by the electric motor. This may sound trivial, but this measurement must also produce accurate results in conjunction with frequency converters. To precisely meet these requirements, the Dynamic-MotorAnalyzer can increase its sampling rate to up to 2.5 million measurements per second.

With the Dynamic MotorAnalyzer, you receive an easy-to-use measurement tool to uncover complex problems within the machine system. Before replacing a defective electric motor, the cause of failure should always be clarified. Otherwise, a replaced electric motor may also fail due to the same cause of failure, leading to renewed downtime and repair costs.

Test bench for electric motors

With the Dynamic-MotorAnalyzer, the operator can run measurements on a load test bench. This allows torque/speed characteristics to be recorded. For this purpose, the Dynamic-MotorAnalyzer provides additional measurement inputs.

Via the inputs, the torque signal, speed signal, and temperature can be measured from a torque measurement shaft. Together with the electrical input quantities, the system provides precise information about the electric motor.

Depending on the configuration of your test bench, the Dynamic-MotorAnalyzer can take over control and regulation tasks of the test bench. This makes the Dynamic-MotorAnalyzer excellently suited for retrofitting existing test benches.

The fast, intelligent measurement technology and the operator-friendly, intuitive analysis software are perfectly coordinated. A few setting clicks and selection options are sufficient to configure and start the test for the connected electric motor.

Only when the collected results are to be saved after the measurement, is it necessary to input the nameplate data and any additional parameters, as these will be required later for searching in the memory.

The extensive evaluations yield clear and understandable results. No specific detailed knowledge is required to operate the evaluation software. From the 6 electrical quantities (3 x voltage and 3 x current), the software calculates all other electrical and mechanical parameters.

No comparable test device, when combined with the EncoderAnalyzer functionality, offers as many analyses as the Dynamic-MotorAnalyzer. The range of evaluations is immense, yet easily comprehensible. The modern user interface is clear and not cluttered with Windows® windows, which is a hallmark of modern measurement technology.

Analysis of the Power Supply

Power quality – whether from the energy provider or the frequency converter – significantly influences the operating behavior of the electric motor. Undervoltage, overvoltage, phase asymmetry, or excessive harmonic content all negatively impact the electric motor, leading to reduced power output. Therefore, the following measurements and analyses of the power supply are performed on phases L1, L2, and L3:

• Minimum, maximum, and average RMS voltage values
• Minimum and maximum peak voltage value
• Minimum, maximum, and average mains frequency values
• Minimum, maximum, and average phase angles between phases
• Minimum, maximum, and average voltage unbalance between phases
• Harmonic analysis up to the 50th harmonic including graphical representation
• Crest factor, Total Harmonic Distortion (THD), Harmonic Voltage Factor (HVF) and more
• NEMA Reduction Factors
• Symmetrical Components
• Graphical voltage representations during mains or frequency converter operation
• Graphical voltage representations of the fundamental wave and harmonics during frequency converter operation

Analysis of the electric motor current consumption

The electric motor current and the relationship between voltage and electric motor current contain almost all information regarding the electric motor's condition and load characteristics. This data is filtered from the measured values by the software, analyzed, and presented in an understandable manner, even for the technically less experienced operator. The following measurements and analyses of the electric motor current are performed in phases L1, L2, and L3:

• Minimum, maximum, and average RMS current values
• Minimum and maximum peak current value
• Minimum, maximum, and average current unbalance between phases
• Current relative to the rated current
• Harmonic analysis up to the 50th harmonic including graphical representation
• Total Harmonic Distortion (THD) and Harmonic Voltage Factor (HVF)
• Symmetry of the impedances
• Vector Sum Current
• Eccentricity in the air gap
• Determination of speed from current
• Inspection of the squirrel cage rotor for broken rotor bars
• Graphical current displays for mains and inverter operation
• Starting current analysis

Analysis of load and operating conditions

Further operating parameters are determined from the supply voltage and the electric motor current. These include:

• Minimum, maximum, and average values of Cos  and PF in the phases
• Electrical power, active power, reactive power
• Torque estimation and torque ripple
• Torque spectrum
• Overload peak detection
• Utilization or % overload or % underload
• Efficiency
• Torque measurement with measuring shaft
• Speed measurement with non-contact tachometer
• Electric Motor Temperature
• Various types of mechanical problems on the electric motor
• Vibration measurement in X, Y, and Z directions on both electric motorsides simultaneously with voltage and current measurement
• Starting or electric motor start measurement 
• Determination of energy costs
• Determination of cost-effectiveness with improved efficiency

Short-term measurement

The measurement can be run similarly to using a multimeter and is often of short duration. The measurement duration can range from a few minutes to several hours.

If required, the measurements, along with all determined analyses, can be stored directly in the E-Motor memory. Extensive protocol printing is also possible.

Transient Analysis | Frequency Converter Operation

Transients are unusual measured values such as voltage, current, and torque peaks. Transients can cause problems in the electric motor or indicate electric motor problems. The Dynamic-MotorAnalyzer is configured to continuously measure and examine the measured values for transients. As soon as it detects a transient, it begins to record and graphically display the measured values. A typical transient measurement is, for example, the electric motor start.

The software is capable of displaying both the individual measured values of the oscillations and their RMS values.

Whether voltages from the mains or from the frequency converter – the Dynamic-MotorAnalyzer is suitable for both types of electric motor supply. This allows for the detection of faults in the converter, such as defective power semiconductors or an incorrect U/f setting.

Whether voltages from the mains or from the frequency converter – the Dynamic-MotorAnalyzer is suitable for both types of electric motor supply. This also enables you to detect malfunctions of converters, such as defective power semiconductors or an incorrect U/f setting  .

Long-term measurement

For long-term observation of the electric motor's condition, measurements can run over several days. Long-term measurements can run continuously or be triggered based on configurable events. Specific events can include, for example, current or voltage peaks, torques, etc. When an event occurs, the long-term measurement is started and automatically stopped after the event subsides. In this way, measured value recording is limited to unusual machine states.

Stored long-term measurements can be reloaded and analyzed directly, as if the measurement were currently taking place live.

• Power Quality Analysis – Power Quality Analysis
• electric Motor Analysis – E-Motor Quality Analysis
• Load Analysis – E-Motor Load Analysis

• Professional Motor Analysis without Required Prior Knowledge of the operator
• Ideal for troubleshooting on the mains or frequency converter
• Ideal for troubleshooting on the electric Motor
• Ideal for troubleshooting on the mechanical load
• Ideal for preventive maintenance
• Determination of Mechanical Performance Parameters and Torque
• Trend Analysis, Prognosis
• Long-term Analysis
• Electric Motor Start-up Analysis
• Efficiency Analysis
• Load Factor Analysis
• Energy Cost Analysis

• Continuous Real-time Permanent Measurement, Measured Values are Permanently Displayed
• Direct Voltage Measurement up to 700 V_RMS
• Indirect Voltage Measurement via PTs up to 50 kV
• Current Clamp Measurement Ranges from 5 – 5,000 A_RMS
• Current Measurement via CTs up to 10 kA_RMS

• Built-in oscilloscope function for evaluating voltages, currents, and power…
• Switch-over to country-specific units such as Nm, lb-ft, HP, kW, etc.
• Memory for storing the results
• Comprehensive, self-configurable print protocol
• Battery operation
• Universal voltage supply 90 – 250 V / 47 – 63 Hz