HD Series – Hysteresis Dynamometers

Support & Downloads

Product BrochureProduct ManualProduct Datasheet

Product Description

Hysteresis Brake Dynamometers (HD Series) are versatile and ideal for testing in the low to medium power range (maximum 14 kW intermittent duty).  With a Hysteresis Braking system, the Dynamometers do not require speed to create torque, and therefore can provide a full motor ramp from free-run to locked rotor.  Brake cooling is provided by convection (no external source), by compressed air or by dedicated blower, depending on the model.  All Magtrol Hysteresis Dynamometers have accuracy ratings of ± 0.25% full scale — depending on size and system configuration.
To better integrate dynamometers into systems, Magtrol offers both long and short base plates.  The shorter base plate facilitates easier motor mounting when used with T-slot tables and Magtrol Adjustable Motor Fixtures, where as the long base plates are better suited for table top testing.

Features

  • 16 Standard Models with Maximum Torque from 2.5 oz·in to 500 lb·in (18 mN·m to 56.5 N·m)
  • Hysteresis Braking System: Provides precise torque loading independent of shaft speed
  • Motor Testing from No Load to Locked Rotor
  • Accuracy: ±0.25% (Full Scale)
  • Air Flow Sensor: For protection against overheating and operator error
  • Standard Torque Units: English, Metric and SI
  • Base Plate: Available in long or short versions
  • Custom Dynamometers: for special torque and speed requirements
  • Easy Calibration

The Hysteresis Braking System

All Magtrol Hysteresis Dynamometers absorb power with a unique Hysteresis Braking System which provides frictionless torque loading independent of shaft speed. The Hysteresis Brake provides torque by the use of two basic components – a reticulated pole structure and a specialty steel rotor/shaft assembly – fitted together but not in physical contact. Until the pole structure is energized, the drag cup can spin freely on its shaft bearings. When a magnetizing force from the field coil is applied to the pole structure, the air gap becomes a flux field and the rotor is magnetically restrained, providing a braking action between the pole structure and rotor.

 

 

 

 

 

Specifications and Drawings

ModelMaximum Torque Range
(Metric)		Maximum Torque Range
(English)		Maximum Speed (rpm)Kinetic Power - 5 Minutes (W)Kinetic Power - Continuous (W)Short Base Plate Downloads
HD-106-5C0.018 N·m2.5 oz·in30,000357pdf | step
HD-100-5C0.08 N·m11 oz·in25,0007520pdf | step
HD-400-5C0.28 N·m40 oz·in25,00020055pdf | step
HD-500-5C0.85 N·m120 oz·in25,00040080pdf | step
HD-510-5C0.85 N·m120 oz·in25,000750375pdf | step
HD-505-5C1.7 N·m240 oz·in25,000800160pdf | step
HD-515-5C1.7 N·m240 oz·in25,0001,500900pdf | step
HD-700-5C3.10 N·m440 oz·in25,000700150pdf | step
HD-710-5C3.10 N·m440 oz·in25,0001,500935pdf | step
HD-705-5C6.20 N·m55 lb·in25,0001,400300pdf | step
HD-715-5C6.20 N·m55 lb·in25,0003,4003,000pdf | step
HD-800-5C14.00 N·m125 lb·in12,0002,8001,800 pdf | step | T-slot step
HD-810-5C14.00 N·m125 lb·in12,0003,5003,000pdf | step | T-slot step
HD-805-5C28.0 N·m250 lb·in12,0005,3002,250pdf | step | T-slot step
HD-815-5C28.0 N·m250 lb·in12,0007,0006,000pdf | step | T-slot step
HD-825-5C56.5 N·m500 lb·in8,00014,00012,000pdf | step | T-slot step

Note: Operating at the continuous power rating for periods of up to 4 hours is acceptable. However, operating for extended periods at high temperatures will result in premature component and bearing failure. Limiting the length of the cycle and the component temperatures will guard against premature failure. Where continuous duty is desired for longer time intervals, component temperatures should be maintained less than 100°C; monitoring the outside brake surface temperature is a sufficient reference.

  • Model HD-510, HD-515, HD-800 and HD-805 Dynamometers require air cooling provided by user. Regulator and filter package is provided as standard equipment on these units. See data sheet for pressure ratings.
  • Blower package is included as standard equipment with Model HD-710, HD-715, HD-810, HD-815 and HD-825 Dynamometers.
  • All -5N(A) dynamometers are 5 Volt Output

Contact Magtrol for 6N (English), 7N (Metric) and 8N (SI) Specifications

Blower Dimensions

Allow approximately 6 in to 8 in (152 mm to 203 mm) between rear
of dynamometer base plate and blower for connection hardware.
Required hardware is supplied with the dynamometer.
 

ModelVoltageVAStyleRating
BL-001120 V600UL/CSA6.30 A | 250 V | SB
BL-001A240 V500IEC3.15 A | 250 V | T
BL-002120 V1,000UL/CSA15.00 A | 250 V | SB
BL-002A240 V1,000IEC6.30 A | 250 V | T

Blower Power and Fuses

  • Models HD-710, HD‑715, HD-810 and ED-715 include the BL‑001 blower.
  • Models HD‑815 and ED-815 include the BL‑002 blower.
  • Model HD‑825 uses two BL‑002 blowers for cooling its two brake sets.
ModelBL-001
(in)		BL-001
(mm)		BL-001
(in)		BL-002
(mm)
ØA61526152
B1127911279
C61526152
D820315381
E41024102
F820312305
G125125
Weight8.5 lb3.9 kg18 lb8.1 kg

 

Applications

  • Motors:
    • Combustion engine (automotive, motorcycle, chainsaw, etc.)
    • Hybrid
    • Electric
    • Hydraulic (Aerospace, machinery)
  • Pumps (hydraulic, oil)
  • Propeller (Aerospace, marine, helicopter)
  • Automobile industry, torque measurement on labor and/or production (Formula 1, screen wiper, electrical windows, starter, generator, brake)
  • Reduction gear, gearboxes
  • Clutch, overload clutch
  • Motorized valve drill, pneumatic tools
  • Other machine tools

 

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
DSP7010High-Speed Programmable Dynamometer 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•••

Special Designs

Low Speed TestingFor low speed motors, such as gear motors with maximum speeds of less than 200 rpm, Magtrol offers additional encoder options that allow for increased resolution of the speed signal. Please refer to the data sheet for ordering information.
High Speed TestingFor certain models, Magtrol can provide a dynamometer which can operate at higher than rated speeds.
Mechanical ModificationsMagtrol can provide customized base plates, riser blocks and shaft modifications.
Analog OutputMagtrol can provide a 0-5 VDC analog output for the torque signal and a TTL speed signal from the dynamometer.

HD Tandem Dynamometer

Magtrol offers Hysteresis Dynamometers mounted in tandem. In tandem, motors of different size can be tested simultaneously using only one bench. This system also allows different brake – torque transducer configurations according to motor size.

HB 715 + TM 307 mounted in tandem with HB 815 + TM 310

 

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_content] => Magtrol’s AMF Series Adjustable Motor Fixtures are used to secure small to medium-sized motors in place while running any test. These extremely versatile fixtures also enable easy motor centering for coupling to a Magtrol HD Series Hysteresis Dynamometer. (Couplings can be supplied upon request.) Various motor lengths are accommodated by either an attached T-slotted base plate or sliding base, depending on the model.

The AMF-1, -2 and -3 Fixtures feature one or two adjustable bridges, each fitted with a fluted knob clamp screw, to allow clamping anywhere along the axis of the motor. The adjustable bridge on the AMF-V Fixture incorporates a straight-line action clamp with a V-angle rubber padded clamp to maximize the mounting area.

To safeguard the motor, locking thumb screws provide protection against vibration and all motor-to-fixture contact surfaces are nylon padded for scratch-free clamping.
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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] => 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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The AMF-1, -2 and -3 Fixtures feature one or two adjustable bridges, each fitted with a fluted knob clamp screw, to allow clamping anywhere along the axis of the motor. The adjustable bridge on the AMF-V Fixture incorporates a straight-line action clamp with a V-angle rubber padded clamp to maximize the mounting area.

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