WB 23 and WB 27 – High-Speed Eddy-Current Dynamometers

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Product Description

Magtrol’s WB 23 and WB 27 Eddy-Current Dynamometers are designed for very high-speed motors and dental or surgical tool testing applications. By providing a braking torque that is proportional to the rotational speed, rated torque is reached at the rated speed. The Dynamometer features a low level of inertia, due to small rotor dimensions, and brake cooling is provided by air flow inside the dynamometer housing.

A PT temperature sensor continuously monitors the brake temperature and alarms the DSP 7010 Controller to stop the brake excitation current in order to protect the dynamometer from overheating. Torque is measured by a reaction torque transducer placed on the stator. The dynamometer has a torque measuring accuracy rating of ± 0.2 % full scale. The speed is measured by an optical sensor and a 2-PPR encoder. This sensor measures speeds between 10 000 rpm and 100 000 rpm with a full scale accuracy of ± 0.06 % (using a DSP 7010).

Features

  • Torque: 80 mN·m and 150 mN·m
  • Speed: up to 100 000 rpm
  • Power: 250 W continuous; up to 500 W (WB 23) or 1 kW (WB 27) intermittent
  • Low inertia
  • Very low residual torque
  • Stable and smooth braking torque
  • Measuring system with air-bearing
  • Data acquisition via DSP 7010 Controller and M-TEST Software
  • Built-in electronics with Torque & Speed measurement

Operating Principles

The WB 23 and WB 27 Eddy-current Dynamometer provides full braking power at high speed. This type of brake has been specially designed to test motors rotating at speeds up to 100 000 rpm, with the braking torque dependent upon the rotation speed. Due to the 2-PPR encoder, the system is not designed to provide closed loop control below 10 000 rpm.

The dynamometer includes air bearings for minimizing friction and assuring the best possible torque reading accuracy. It is necessary to connect the air input through the air filtering and drying kit (included).

Specifications

MODELRATED POWER
[W]		DURATION AT
RATED POWER
[s]		GUARANTEED
TORQUE
[mN·m]		RATED SPEED
[rpm]		MAX. SPEED
[rpm]		DRAG TORQUE
DE-ENERGIZED
(at 100 000 rpm)
[mN·m]		NOMINAL
INPUT
INERTIA
[kg·m2]		EXCITATION
CURRENT MAX.
[A]
RATINGS
WB 23250steady operation8030 000100 00023.2 x 10-60.8
4001808050 000100 00023.2 x 10-60.8
5001208060 000100 00023.2 x 10-60.8
WB 27250steady operation15016 000100 00028.75 x 10-60.5
50018015032 000100 00028.75 x 10-60.5
1 0004515063 000100 00028.75 x 10-60.5
MECHANCAL & ELECTRICAL CHARACTERISTICS
Weight~ 18 kg (short base plate) / ~ 21 kg (long base plate)
Air SupplyRecommended air quality ISO 8573.1 Class 3 | Air flow: 7-10 l / min | Pressure: 4-5 bar (max. 6 bar)
Power Supply90 - 230 VAC

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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                    [post_date] => 2017-04-05 13:21:38
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                    [post_content] => 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.
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                    [post_content] => Magtrol's M-TEST 7 is a state-of-the-art motor testing program for PC (Windows® 10/11 64-bit) based data acquisition. Used with a Magtrol Programmable Dynamometer Controller, M-TEST 7 works with any Magtrol Dynamometer or In-Line Torque Transducer to help determine the performance characteristics of a motor under test. Up to 63 parameters are calculated and displayed utilizing M-TEST 7's feature-rich testing and graphing capabilities.

National Instruments LabVIEW an integral component of any Magtrol Motor Test System, M-TEST 7 performs ramp, curve, manual, pass/fail, coast, temperature, locked rotor temperature and running heating temperature tests in a manner best suited to the overall efficiency of the test rig. Written in LabVIEW™, M-TEST 7 has the flexibility to test a variety of motors in a multitude of configurations. The data generated from this user-friendly program can be stored, displayed and printed in tabular or graphical formats, and is easily imported into a spreadsheet.

Magtrol can also make custom modifications to the software to meet additional motor testing requirements.

NOTE: M-TEST 7 does not support the following:

    
 	
  • 5240, 4629B or older controllers
    • 
 	
  • 4612B, 4614B or older power analyzers
    • 
 	
  • National Instruments FieldPoint analog I/O
    • 
 	
  • Advantech PCL-725, PCI-1760 digital I/O
    • 


**MTEST-7 Motor Test Software is offered as a single seat license. Additional seats can be purchased and added to the original license. Contact sales for pricing.**

[table id=21 /]

License Verification via Crypkey Casper E-Register

Casper eRegister provides automatic authorization of M-TEST 7 using serial numbers. With this solution, the customer pre-pays the license fee and is then provided with a serial number to automatically obtain a code to unlock M-TEST 7 via the Internet. Casper eRegister works 24/7/365, without human intervention.

Just click on the electronic registration button on the M-TEST 7 license configuration screen.

Analog Input Measurement

Up to 128 thermocouples or analog sensors can be read and monitored during a motor test. Heat rise curves on the bearings, windings and housing of a motor can be performed and air flow/exhaust efficiencies can be measured with an air tool or internal combustion engine. M-TEST 7, with its complete dynamometer control, even allows for analog measurement while performing load simulation for duty cycle and life testing.

Applications

M-TEST 7—besides being well-suited for simulating loads, cycling the unit under test and motor ramping—is also ideal for production line and inspection applications, due to its pass/fail test function. Another time-saving feature that engineering labs will benefit from, is the ability to duplicate tests and run them automatically. This versatile program is extremely valuable to anyone involved in motor testing.

System Minimum Requirements


    
 	
  • Personal computer with Intel® Pentium® i5 processor (or equivalent)
    • 
 	
  • Microsoft® Windows® 10/11 64-bit
    • 
 	
  • 8 GB RAM
    • 
 	
  • 5 GB of available hard drive space
    • 
 	
  • VGA color monitor with minimum screen resolution of 1024 × 768
    • 
 	
  • National Instruments™ PCI-GPIB card, GPIB-USB-HS Interface(available from Magtrol).  The GPIB card can be used for interfacing with Magtrol DSP6000, DSP6001 or DSP7000 Controllers.
    • 
 	
  •  In addition, a USB Interface can be used with the DSP7000 or DSP7010 Controller.
    • 



M-TEST 7 Viewer


M-TEST 7 Viewer allows the user to create and modify test setups, and view, graph and compare data – everything standard M-TEST 7 does except perform tests. Free download, unlimited use.

Download M-TEST 7 Viewer
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                    [post_excerpt] => Download free 30 day trial of M-TEST 7 Motor Testing Software.
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                    [post_content] => Magtrol's Model DSP7000 High-Speed Programmable. Dynamometer Controller employs state-of-the-art Digital Signal Processing Technology to provide superior motor testing capabilities. Designed for use with any Magtrol Hysteresis, Eddy-Current or Powder Brake Dynamometer, Magtrol In-Line Torque Transducer or auxiliary instrumentation, the DSP7000 can provide complete PC control via IEEE-488 or RS-232 interface. With up to 500 readings per second, the DSP7000 is ideally suited for both the test lab and the production line.
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                    [post_content] => The Powder Brake Dynamometer (PB Series) contains, as its name suggests, a magnetic powder. The electrical current passing through the coil generates a magnetic field, which changes the property of the powder, thus producing a smooth braking torque through friction. They are ideal for applications operating in the low to middle speed range or when operating in the middle to high torque range. Like Hysteresis Brakes, Powder Brakes provide full torque at zero speed. Like the Eddy-Current Brake Dynamometers, the PB series are water-cooled, allowing for power ratings up to 48 kW. The PB Dynamometers have accuracy ratings of ± 0.3% to 0.5% full scale (± 2% for PB 2.7), depending on size and system configuration. Additional mounting possibilities include speed pickup and OEM version IS.

Features


    
 	
  • 12 Models with Maximum Torque from 600 mN·m to 1 200 N·m (84 oz·in to 885 lb·ft)
    • 
 	
  • Braking Power: 150 W to 48 kW
    • 
 	
  • Stable Braking Torque
    • 
 	
  • Low Moment of Inertia
    • 
 	
  • Operation in Either Rotational Direction
    • 
 	
  • Braking Torque Measurement Integrated
    • 
 	
  • Integrated Optical Speed Sensor
    • 
 	
  • Special designs available upon request
    • 



Operating Principles

The PB Series - Powder Dynamometers contain, as their name suggests, a magnetic powder. The electrical current passing through the coil generates a magnetic field, which changes the property of the powder, thus producing a smooth braking torque through friction between rotor and stator. The Powder Dynamometers (PB) produce their rated torque at zero speed. The element to be tested can be loaded at standstill to determine the starting torque.

Optical Speed Sensor
Each PB Series Dynamometer has an optical speed sensor delivered as standard. PB 2.7 & PB 43 has an optical speed sensor with a 30-PPR encoder; PB 65, PB 115 & PB 15 has an optical speed sensor with a 60-bits pulse wheel. For higher speed resolution in low speed applications, Magtrol offers a 600-PPR or 6000-PPR encoder as an option.
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            [post_content] => 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.
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