Drive Test Bench
Drive test bench for DC and BLDC motors
Our special service for the right selection and configuration of the drive systems
On JBW’s drive test bench, values for current, voltage, speed, torque and temperature characteristics are read and processed in order to evaluate motors in their load and functionality.
Together with the measured data of the application-specific load characteristics, which are recorded on a prototype by a digital storage oscilloscope, an optimal drive system can finally be configured, perfectly matching with the application requirements.
Benefits of drive test bench results
- Selection of the most suitable DC motor
- Process reliability
- Reproducibility
- Documentation
Structure of the drive test bench
How the drive test bench is set up and equipped at JBW. This allows many facts to be clearly measured and documented in a binding manner.
Brake types at the test bench
- Magnetic powder brake from 0.5-50 Nm to 1,000 rpm
- Hysteresis brake from 0-6 Nm to 10,000 rpm
Measuring channels
- Current
- Voltage
- Speed
- Torque
- Temperature
Testing profile
- Recording of the characteristic curve
- Back torque (static and dynamic)
- Temperature test
- Continuous running test
- Freely programmable test cycle
Motor characteristic visualized
Such curves show the motor characteristic clearly. We have here tested the planetary gear motor P021032.0198.00.
What means a motor curve?
Here the X-axis shows the torque, the right Y-axis the speed (blue) and the left Y-axis the power consumption (red).
Each DC geared motor is loaded with a brake on the JBW motor test bench, and therefore gets slower and slower (the blue speed line drops). In order to be able to continue turning, an electric motor draws more current (the red line rises). Using the characteristic curve created in this way, it is possible to quickly see how the respective motor behaves at which torques. That means how fast it is and how much electricity it consumes in each case.
Why are the motors not always braked to the end, i.e. until speed 0 is reached and the torque is highest?
Not every transmission can withstand that much torque. With particularly large gear ratios, there is even the risk of destroying the gearbox. Each gear unit has its own nominal and maximum torque.
How do you determine the nominal torque of a motor?
With electric motors, the nominal torque is not a fixed point, but rather a range. The nominal range of the torque is approx. 1/3 of the maximum torque. The motors can of course be operated briefly up to the defined maximum torque.
What happens to the characteristic curve when you increase or decrease the voltage?
If the voltage is increased or decreased, the speed line moves almost proportionally up or down. This means that if, for example, the voltage is only 12V instead of 24V, then the speed drops by 50%.
Do you need answers to further questions?
