HB-type instruments for measuring speed-torque characteristics
What range of output power can these instruments measure?
Sugawara's HB-type instruments designed to measure speed-torque characteristics can measure torque values of up to 100 N·m (maximum rotation speed under no load: 7,000 r/min), 18 kW for practical applications. For low torque measurements, we provide torque meters with a full scale range of 0.1 mN·m (maximum rotation speed under no load: 30,000 r/min).
How do these products sense torque?
They measure torque with a load cell incorporating a strain gauge. The load cell senses the rotating force applied by the stator of the hysteresis brake driven by the test motor.
What types of brakes does the HB measurement component use?
Common brake types include hysteresis brakes, motor brakes, and powder brakes. Sugawara's speed-torque measuring instruments use hysteresis brakes, which offer superior constant braking force in accordance with the current supplied, even with changing rotation speeds.
What advantages does the hysteresis brake system offer over other systems?
The hysteresis brake system achieves braking force through hysteresis loss in the magnetic material. Theoretically, this system can achieve constant torque characteristics unaffected by rotation speed. It's also easily controlled electronically, and the unit is relatively compact. It accommodates a wide range of rotation speeds. The hysteresis brake is featured in this non-contact type braking system, giving it very long service life.
Can I perform a durability test (continuous load test) involving a constant load?
Although this is possible, since the maximum continuous measurement time of the HB measurement component varies with input power, you need to be sure to use the instrument correctly, referring to an input absorption characteristic chart.
Continuous operation of the instrument beyond operating limits indicated in the input absorption characteristic chart will result in unreliable measurements and possibly cause equipment malfunctions.
Is it possible to measure the load characteristics of a high-speed motor rotating at 40,000 r/min?
For high-speed motors, you can select and use a measurement component modified to measure high rotation speeds. It's important to choose an appropriate measurement component in keeping with the output power calculated based on rotation speed and torque value.*
* Motor output (watt) is expressed by the following equation: Torque (N·m) x Rotation speed (r/min) x 0.1047.
Can the HB measurement component begin measurements when the test motor rotates under no load?
No. The loss generated by the bearing that supports the hysteresis brake acts as a load.
Can I purchase just the hysteresis brake unit?
Yes. Contact us to discuss the specific application, operating conditions, and other aspects, and we'll determine the unit you need.
Is it possible to measure the load characteristics of a motor placed in a constant-temperature oven?
Yes. You can measure the load characteristics of a motor placed in an existing or new constant-temperature oven. Many users have installed our products in their constant-temperature ovens. For more information on actual installation cases, read "Dynamometer for Environmental Tester" on our website.
