The Dynamic-MotorAnalyzer combines precision and convenience: measuring module and analysis software are compactly integrated into the robust measuring case – ready for use directly on your electric motor.

It is common for electric motors to become overloaded during operation or to fail for unexplained reasons. This can be due to the power supply, the electric motor itself, or its load. The cause of the fault can be electrical or mechanical.

The cause of a fault is often difficult to find, as the electric motor is frequently part of a complex machine or installed in a hard-to-reach system. However, the electric motor's power supply cable in the control cabinet is usually more easily accessible. Here, the six electrical parameters (3 x U and 3 x I) can be measured directly. The Dynamic-MotorAnalyzer then uses various analytical methods to determine the "health" of your electric motor.

The Dynamic Motor Analyzer offers automatic phase correction. If you accidentally connect a phase with reversed polarity or incorrectly, you don't need to disconnect and reconnect the test lead. The Dynamic Motor Analyzer checks the connection and adjusts accordingly.

The Dynamic Motor Analyzer features additional analog and digital inputs. These can be quickly and easily configured via software for a wide variety of measurement signals. This allows for the simple measurement and evaluation of not only electrical parameters but also electric motor temperatures, vibrations, flow rates, and pump pressures. The goal is to provide the user with the most comprehensive overview of the machine possible.

Dynamic electric motor analysis and its possibilities

The electric motor is supplied with three-phase alternating current by the power company or a frequency converter. The three phase voltages must meet specific conditions for the electric motor to operate correctly and within its specifications. Significant deviations result in incorrect operating conditions for the electric motor, which typically leads to overheating.

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

Voltage and current together result in the power that the electricMotor . This sounds trivial, but this measurement must also lead to correct results in conjunction with frequency converters. To meet these requirements exactly, the Dynamic-MotorAnalyzer can increase its sampling rate to up to 2.5 million measurements per second.

The Dynamic MotorAnalyzer provides you with an easy-to-use measuring tool for uncovering complex problems in machine systems. Before replacing a defective electric motor, the cause of the failure should always be determined. Otherwise, a replaced electric motor may also fail due to the same underlying cause, resulting in further downtime and repair costs.

Test bench for electric motors

The Dynamic Motor Analyzer allows the user to perform measurements on a load test bench. This enables the recording of torque/speed characteristic curves. The Dynamic Motor Analyzer provides additional measurement inputs for this purpose.

The inputs allow the torque signal, speed signal, and temperature to be measured from a torque measuring shaft. Together with the electrical input variables, the system provides precise information about the electric motor.

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

The fast, intelligent measurement technology and the user-friendly, intuitive analysis software are perfectly coordinated. Just a few clicks and selections are all it takes to configure and start the test for the connected electric motor.

Only when the collected results are to be saved after the measurement is the input of the nameplate data and possibly other framework conditions required, as these are later needed for the search in the database.

The comprehensive analyses lead to clear and understandable results. No special technical knowledge is required to operate the analysis software. From the six electrical quantities (three voltage and three current), the software calculates all other electrical and mechanical quantities.

No comparable testing device offers as many analyses in combination with the Encoder Analyzer functionality as the Dynamic Motor Analyzer. The variety of evaluations is immense, yet easy to understand. The modern user interface is clear and uncluttered with Windows® windows. This is what characterizes modern measurement technology.

Analysis of network supply

The power quality – from the energy supplier or the frequency converter – has a decisive influence on the operating behavior of the electric motor. Whether undervoltage or overvoltage, asymmetry between the phases, or excessive harmonic content, all of these negatively affect the electric motor and lead 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 values ​​of the voltage RMS values
• Minimum and maximum voltage peak value
• Minimum, maximum and average values ​​of the mains frequency
• Minimum, maximum and average values ​​of the phase angles between the phases
• Minimum, maximum and average values ​​of the voltage imbalance between the phases
• Harmonic analysis up to the 50th harmonic, including graphical representation
• Crest factor, total distortion (THD), power reduction 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 the harmonics during frequency converter operation

Analysis of electric motor current consumption

The electric motor current and the relationship between voltage and current contain almost all information about the motor's condition and load. This information is extracted from the measured values ​​by the software, analyzed, and presented in a way that is easily understandable even for users without technical expertise. The following measurements and analyses of the electric motor current are performed in phases L1, L2, and L3:

• Minimum, maximum and average values ​​of the RMS current values
• Minimum and maximum current peak value
• Minimum, maximum and average values ​​of current imbalance between the phases
• Current in relation to the rated current
• Harmonic analysis up to the 50th harmonic, including graphical representation Depiction
• Total Distortion (THD) and Power Reduction Factor (HVF)
• Symmetry of impedances
• Vectorial sum stream
• Eccentricity in the air gap
• Determining the rotational speed from the current
• Inspection of the cage rotor for broken rotor bars
• Graphical current representations during grid and inverter operation
• Inrush current analysis

Analysis of load and running conditions

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

• Minimum, maximum, and average values ​​of the cosine  and the PF in the phases
• Electrical power, active power, reactive power
• Torque estimation and torque ripple
• Torque spectrum
• Overload peak detection
• Capacity utilization or % over- or % under-utilization
• Efficiency
• Torque measurement with measuring shaft
• Speed ​​measurement with a non-contact tachometer
• Electric motor temperature
• Mechanical problems of various kinds with the electric motor
• Vibration measurement in X, Y and Z directions on both sides of the electric motor simultaneously with voltage and current measurement
• Starting or electric motor start measurement 
• Determining energy costs
• Determining profitability costs with improved efficiency

short-term measurement

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

The measurements, along with all the analyses obtained, can be saved directly to the electric motor database if required. A comprehensive report printout is also possible.

Transient analysis | Frequency converter operation

Transients are unusual measurement events such as voltage, current, and torque spikes. Transients can cause problems in an electric motor or indicate existing issues. The Dynamic Motor Analyzer is configured to continuously measure and analyze the readings for transients. As soon as it detects a transient, it begins recording and graphically displaying the measured values. A typical example of a transient measurement is during an electric motor start-up.

The software is able to display both the measured individual values ​​of the vibrations and their RMS values.

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

Whether the voltage comes from the mains or from a frequency converter – the Dynamic Motor Analyzer is suitable for both types of electric motor power supply. This also allows you to detect converter malfunctions such as defective power semiconductors or an incorrect U/f setting.  to recognize.

Long-term measurement

For long-term monitoring of the electric motor's condition, measurements can be performed over several days. These long-term measurements can be continuous or triggered by configurable events. Specific events can include, for example, current or voltage spikes, torque spikes, etc. When an event occurs, the long-term measurement is started and automatically stopped once the event has subsided. In this way, the measurement data recording is limited to exceptional machine conditions.

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

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

• Professional engine analysis without requiring prior user knowledge
• Ideal for troubleshooting on the power grid or frequency converter
• Ideal for troubleshooting electric motors
• Ideal for troubleshooting mechanical loads
• Ideal for preventative maintenance
• Determination of the mechanical performance parameters and torque
• Trend analysis, forecast
• Long-term analysis
• Electric motor start-up analysis
• Efficiency analysis
• Capacity utilization analysis
• Energy cost analysis

• Continuous real-time measurement; measured values ​​are displayed permanently.
• Direct voltage measurement up to 700 V _rms
• Indirect voltage measurement via PTs up to 50 kV
• Current clamp measuring ranges from 5 – 5,000 A _rms
• Current measurement via CTs up to 10 kA _rms

• Integrated oscilloscope function for assessing voltages, currents, and power…
• Switching to country-specific units such as Nm, lb-ft, HP, kW, etc.
• Database for storing results
• Comprehensive, self-configurable print protocol
• Battery operation
• World voltage supply 90 – 250 V / 47 – 63 Hz