WB Series – Eddy-Current Dynamometers

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Eddy-Current Dynamometer

Product Description

Eddy-Current Brake Dynamometers (WB Series) are ideal for applications requiring high speeds and also when operating in the middle to high power range. Eddy-Current Brakes provide increasing torque as the speed increases, reaching peak torque at rated speed. The dynamometers have low inertia as a result of small rotor diameter. Brake cooling is provided by a water circulation system, which passes inside the stator to dissipate heat generated by the braking power, providing high continuous power ratings (max. 140 kW). The WB dynamometers have accuracy ratings of ± 0.3% to 0.5% full scale (± 2% for WB 2.7), depending on size and system configuration. Additional options include: high-speed version, speed pickup, mechanical rotor blocking device, OEM version IS and vertical mounting.

Features

  • 13 Models with Maximum Torque from 300 mN·m to 560 N·m (42 oz·in to 413 lb·ft)
  • Braking Power: from 500 W to 140 kW
  • Stable Braking Torque, without Shock
  • Low Moment of Inertia
  • Low Residual Torque
  • Operating Direction CW / CCW
  • Braking Torque Measurement Integrated
  • High Rotational Speed
  • Integrated Optical Speed Sensor
  • Special designs available upon request

Operating Principles

The WB Eddy-Current Dynamometers develop their full power at high rotation speeds. The WB Series is particularly intended for motors which rotate at high speeds, up to 65 000 rpm (up to 100 000 rpm with WB 23 / 27; see specific datasheet). The braking torque depends on the rotation speed.

Optical Speed Sensor
Each WB Series Dynamometer has an optical speed sensor delivered as standard. WB 2.7 & WB 43 has an optical speed sensor with a 30-PPR encoder; WB 65, WB 115 & WB 15 has an optical speed sensor with a 60-PPR encoder.

System Configuration

 

Specifications

MODELRATED TORQUE (METRIC)
[N·m]		RATED TORQUE (ENGLISH)
[oz·in]		RATED POWER
[kW]		RATED SPEED
[rpm]		MAX. SPEED
STANDARD
[rpm]		MAX. SPEED
HIGH SPEED
(HS VERSION)
[rpm]		DOWNLOADS 1)
(STANDARD VERSION)
2 WB 2.70.342.40.515 91550 000N/Apdf | step
3 WB 2.70.4563.70.7515 91550 000N/Apdf | step
4 WB 2.70.684.91.015 91550 000N/Apdf | step
1 WB 431.5211.21.59 55050 00065 000pdf | step
2 WB 433.0422.43.09 55050 00065 000pdf | step
MODELRATED TORQUE (METRIC)
[N·m]		RATED TORQUE (ENGLISH)
[lb·ft]		RATED POWER
[kW]		RATED SPEED
[rpm]		MAX. SPEED
STANDARD
[rpm]		MAX. SPEED
HIGH SPEED
(HS VERSION)
[rpm]		DOWNLOADS 1)
(STANDARD VERSION)
1 WB 65107.365 73030 00050 000pdf | step
2 WB 652014.7125 73030 00050 000pdf | step
1 WB 1155036.8152 86518 00022 000pdf | step
2 WB 11510073.7302 86518 00022 000pdf | step
1 WB 15140103.0352 3907 50010 000pdf | step
2 WB 15280206.0702 3907 50010 000pdf | step
3 WB 15420309.01052 3907 50010 000pdf | step
4 WB 15560413.01402 3907 50010 000pdf | step

1) Dimensions for the specific versions (HS, IS, …) can slightly vary from the standard versions. For specific drawing, please, contact our sales technicians.

Applications

Mounted on test benches, the WB Series Eddy-Current Dynamometers allow performance and reliability testing on driving elements such as servomotors, micromotors for cameras, fans, drills, combustion engine, pumps, pneumatic equipment, hydraulic transmission systems, gas turbines, spindles, compressors and motors for domestic appliances.

System Options

To help you select the components for your motor testing system, this table shows which (currently available) electronics and software support Magtrol’s different types of dynamometers.

ModelDescriptionHysteresis Dynamometers (including ED Series)Eddy-current DynamometersPowder Brake DynamometersDial Weight Dynamometers
DYNAMOMETER CONTROLLERS
DSP7010Dynamometer Controller•••
DSP7000High-Speed Programmable Dynamometer Controller•••
OTHER ELECTRONICS
TSC SeriesTorque/Speed Conditioner
5500Dynamometer Switch Box•
5501Dynamometer Switch Box••
5502Dynamometer Switch Box•
5503Dynamometer Switch Box••
SOFTWARE
M-TEST 7Motor Testing Software•••
POWER SUPPLIES
DES SeriesPower Supply••
5241Power AmplifierRequired for HD-825 Only
5242Power AmplifierRequired for HD-825 Only
5200Power Supply•
5210Current-Regulated Power Supply•
5250Current-Regulated Power Supply•
ACCESSORIES
TABDynamometer Tables••••
AMFAdjustable Motor Fixtures•
FMFFixed Motor Fixtures•
PTT-Slot Base Plate•••
FRSFree-Run Speed Sensor•••
SBB14Signal Breakout Box•••
SBB15Signal Breakout Box•••

Dynamometer Selection

Magtrol Dynamometers cover a wide range of Torque, Speed and Mechanical Power ratings. To select the appropriate size Dynamometer for your motor testing needs, you will need to determine the Maximum Torque, Speed and Power applied to the Dynamometer:

Maximum Torque

It is important to consider all torque points that are to be tested, not only rated torque, but also Locked Rotor and Breakdown Torque. Dynamometer selection should initially be based on the maximum torque requirement, subject to determining the maximum power requirements.

Maximum Speed

This rating is to be considered independent of torque and power requirements, and is the maximum speed at which the Dynamometer can be safely run under free run or lightly loaded conditions. It is not to be considered as the maximum speed at which full braking torque can be applied.

Maximum Power Ratings

These ratings represent the maximum capability of the Dynamometer Braking System to absorb and dissipate heat generated when applying a braking load to the motor under test. The power absorbed and the heat generated by the Dynamometer is a function of the Torque (T) applied to the motor under test, and the resulting speed (n) of the motor. This is expressed in these power (P) formulas:

SI:P (watts)=T (N·m)xn (rpm)x(1.047 × 10-1)
English:P (watts)=T (lb·in)xn (rpm)x(1.183 × 10-2)
Metric:P (watts)=T (kg·cm)xn (rpm)x(1.027 × 10-2)
All of Magtrol's controllers, readouts and software calculate horsepower
as defined by 1 hp = 550 lb·ft / s. Using this definition:
hp=P (watts)/745.7
To calculate power, use Magtrol's online motor power calculator

The Dynamometer’s ability to dissipate heat is a function of how long a load will be applied. For this reason, the Maximum Power ratings given are based on continuous operation under load, as well as a maximum of 5 minutes under load.

To safely dissipate heat and avoid Dynamometer failure, the maximum power rating
is the most important consideration in selecting a Dynamometer.

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Ordering Information

TORQUE 10 is now included with the purchase of a TS Series Torque Sensor or Model 3411 Torque Display.
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