High-Speed Eddy-Current Dynamometers | WB 32 Series

DESCRIPTION
Magtrol’s WB 32 Series - Eddy-Current Dynamometers are designed for high-speed testing applications.They are ideal
for applications requiring high speeds and also when operating in the lower power range (up to 1 kW). By providing a braking torque that is proportional to the rotational speed, rated torque is reached at the rated speed.
 
The Dynamometers feature a low level of inertia, due to small rotor dimensions. Brake cooling (required) is provided
by a water circulation system, which passes inside the stator to dissipate heat generated by braking; this enables higher
continuous power ratings.
 
The stator is mounted on carrier bearings and the torque is measured by the reaction torque sensor protected by overload limiter and transport locking device. The dynamometer has a torque measuring accuracy rating of ± 0.5 % full scale. The speed is measured by an optical sensor and a 4 PPR (Pulses Per Revolution) encoder. This sensor measures speeds from 100 ... 80 000 rpm with a full scale accuracy of ± 0.06 % by using a Magtrol DSP 7010 Series Dynamometer Controller (due to encoder 4 PPR, the system is not suitable for precise closed-loop control below 1 000 rpm).
 
A Thermal Switch monitors the brake temperature and alarms the Controller (DSP 7010 Series) to stop the brake  excitation current in order to protect the dynamometer from overheating.
 
OPERATING PRINCIPLES
The WB 32 Eddy-Current Dynamometers provide their full braking power at high speed. This type of brake has been specially designed to test motors rotating at speeds up to 80 000 rpm (100 000 rpm with WB 23/27, see specific datasheet), with the braking torque dependent upon the rotation speed.

APPLICATIONS
Mounted on test benches, the WB 32 Series Dynamometers allow performance and reliability testing on driving elements such as servomotors, micro and small motors, drone motors, fans, drills, hobby tools, small pumps, spindles, motors for domestic appliances, etc.
 
REVISITED DESIGN
Based on Magtrol's extensive experience in motor testing (over 70 years), the WB 32 Series is the most recent Eddy-
Current Dynamometer and will gradually replace the WB 2.7 Dynamometer. Its design has been rethought to be more
compact, easier to handle and easier to install on a test bench (due to its large base plate).
 
A speed signal conditioner, power supply and all the necessary filter electronics are integrated into the housing, making
the dynamometer a turn-key unit.
 
SYSTEM CONFIGURATION
The WB 32 Series Dynamometers should be used with a Magtrol DSP 7010 Series Dynamometer Controller in order to
supply the closed-loop control of the test system. In addition, the DSP 7010 Series displays the measured torque, rotation speed and mechanical power of the motor under test and features a built-in alarm system for user-defined limits.
 
A Single or Three-phase Power Analyzer (MODEL 7500 Series), a required component in a test system measuring motor efficiency, can be integrated into this system as well as Magtrol’s Temperature Testing Hardware.