A Depending on the motor type, the S1 curve under continuous working has two types of motion phases in the movement from static to rated operating point. Using a constant torque or using the maximum torque permissible on temperature. The power will increase with speed, depending on the type of torque. This is followed by a period of constant power, during which weak magnetism occurs, the range of which is limited by voltage limit values, and overload capacity is generally performed at S6 (40%) operating system.
These factors need to be considered for dynamometer selection: rated power of the motor under test, rated speed, maximum speed, overload factor, etc. And than it is required that the S1 curve of the dynamometer can cover the peak curve of the motor under test.

A For high-speed motors, when the IGBT switching frequency of the frequency converter increases, the output harmonics will increase. Due to the small reactance of the high-speed permanent magnet synchronous motor, harmonics will cause serious heating of the motor. Under harmonic impact, the permanent magnet of the motor will demagnetize, and the control will also be unstable. Therefore, it is necessary to weaken the output harmonics of the inverter .
The switching frequency of the driver is generally selected to be 12-15 times the maximum operating frequency of the motor. The higher the motor frequency, the higher the proportion of required switching frequency.

A The excessive vibration values for high-speed rotating machinery might include such factors as:
1. Poor coaxiality of the shafting. The coaxiality needs to reach 0.02mm ~ 0.03mm normally when the rotation speed gone to 8000rpm.
2. Driving motor have some soft feet.
3. Poor dynamic balance state of the shafting.
4. Resonance exists in certain frequency bands.
5. Faults of the bearing and other supporting parts of the shaft system.

A High-speed bearings are generally used in high-speed shaft systems. The alarm temperature of the high-speed shaft is generally not higher than 75°C, and it is recommended to keep it within 60°C for long-term operation. High bearing temperature is generally caused by the following factor s:
1 . The coaxiality of the shaft ing has deteriorated .
2 . T he bearing lubrication state has deteriorated, need to add grease, or replace the bearing .
3 . I t may be due to the failure of the floating function of the floating end , i f there is a floating end bearing in the shaft system .
4 . Bearing wear increases due to prolonged use .
5 . For bearings that have been in use for a long time, there is a correlation between temperature and vibration, and a large vibration will cause an increase in temperature. In this case, the bearing failure can be determined from the spectrogram.
 

A "Successful cases" is the sole criterion for testing excellent manufacturer. At present, Artesman is main products are power system test benches, hydraulic system test benches, transmission system test benches, as well as non-standard test benches for all kinds of testing systems and dynamometer systems. Over the past 20 years, we have successfully completed a diverse array of testing projects for hundreds of well-known organizations globally. Many of our customers stand as recognized leaders in their respective industries within the Electrified Vehicles (EV) sector, Automotive industry, Aviation and Aerospace, Research and Development testing, Automated Industrial practices, as well as the Marine and Ports domain.

A A dynamometer, or "dyno" for short, is a device used to measure speed (rpm), torque (Nm), or power (Kw). Atestman dynamometers are dynamic and high-precision test equipment used to test the power of an engine primarily, but also as a loading device for gearboxes, reduction gears, and transmissions to test their transmitted power. Besides simple measurements of speed, power and torque, dynamometers also can be used as part of various test benches. By our advantageous technology, the dynamic simulation of actual working conditions, we test the output power, torque, speed and other parameters of the device and calculate its efficiency, energy loss and other performance indicators, which are used to assess the output performance and efficiency of various power units and their reliability. It provides data support for engineers and designers to optimize design and adjust parameters.

A Contact Name：Mr. Lind
Email： info@atestman.com
Shenzhen office： Atestman Technology Co., Ltd.
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