Engineering design consultants offering engineering analysis resource to the manufacturing, engineering and scientific sectors

Magnetic Measurement Flux Meters

To convince visitors to our website that we also make and test the odd prototype, as well as, on occasions, special test and measurement hardware, I thought I’d mention some of the test equipment we use. Some are off-the-shelf, and some are of our own invention. So it’s not all about magnetic simulation and finite element modelling sitting at a desk!

Flux Meter

One of the most useful instruments we have is a flux meter. Ours was bought from Hirst in Cornwall. This type of instrument is an integrating voltmeter, but a high-performance one, which is calibrated in several ranges, is very sensitive and has low drift. The quantity measured is flux linkage, which in SI units is Weber-turns, or volt-seconds (1 Wb-turn = 1 volt-second).

This instrument can be used in conjunction with standard types of measurement coils, for example, a Helmholtz coil for measuring magnetic moment (a decent quality check for permanent magnets at goods in), or probe coils for measuring average flux density. But there are other ways it can be used to make measurements that are useful for confirming the performance of different kinds of motors or actuators.

To make a measurement of the back emf constant of a brushed D.C. motor (numerically equivalent to the torque constant in SI units), simply rotate the armature through a fixed, accurately known angle, and use a flux meter to measure the time integral of the generated voltage at the motor terminals. We often think of back emf constant in units of “volts per radian per second”, which immediately casts our minds into the idea of a motional emf. To understand this measurement technique it is more useful to think “volt-seconds per radian”, in other words, a time integrated voltage resulting from a change in flux linkage.

Magnetic Flux Measurements

Another potentially useful technique arose from a customer who wanted to de-bug his solenoid design. The force produced was not what he expected, and to establish the magnetic conditions inside the prototype we suggested winding a special coil with an additional small gauge “secondary” measurement winding of a known number of turns, and connecting this to a flux meter. Then ramping up the current in the main coil having first locked the armature and zeroed the flux meter. The resulting flux linkage measurement could be used in conjunction with the measurement winding turns count and the solenoid geometry to calculate the flux density inside the coil/armature. The test could be repeated for a range of locked armature positions and final current values to compare with design estimates of air gap flux density.

Contact us to find out more about our services

“Best Solution can support engineers engaged in their own development programmes. We can provide advice and guidance on simulation technique, or more specific coaching on design methods for electromagnetic devices, materials, test and measurement.”

Share on social media

Share on facebook
Facebook
Share on twitter
Twitter
Share on linkedin
LinkedIn
Best Solution Place Holder Finite Element Analysis

Discuss a Project

We enjoy helping our customers with an increasingly broad spectrum of modelling tasks. These continue to present new challenges, and have helped us to build an experienced team and a powerful set of simulation techniques.

Explore more projects by capability...

Projects - Eddy Current Brakes

Eddy Current Brakes

Best Solution can make accurate performance predictions for those designing or developing eddy current brakes. The mechanical design methods we use are largely finite element

Read More »
Projects - High Field Hybrid Magnet

High Field Hybrid Magnet

Best Solution’s customer, Oxford Instruments are world leaders in the design and manufacture of special superconducting magnets. Best Solution were able to provide modelling support

Read More »
Projects - High Speed Electric Motors

High Speed Electric Motors

Both electromagnetic and mechanical finite element modelling are powerful tools for designers of electric machines. For high-speed applications, some examples of the areas where Best

Read More »
Best Solutin - Projects - Ansys EMAG

Ansys EMAG

Best Solution uses a range of software tools to provide our customers with support in the design and performance simulation of products or processes that

Read More »
Best Solutin - Projects - Magnetising Fixtures

Magnetising Fixtures

In order to magnetise modern rare-earth magnets, large magnetic fields are required. The fields required are large enough to present some significant challenges to the

Read More »
Best Solutin - Projects - Best Solutin - Projects - Pump Couplings

Pump Couplings

Magnetic rotary couplings are often used by pump manufacturers to isolate a motor from the pump components. The isolation of these components might be desirable

Read More »
Projects - Gravity Gradiometer

Gravity Gradiometer

Exceptionally sensitive accelerometer type instruments can be used to detect tiny variations in the Earth’s gravitational field. These measurements can be interpreted in terms of

Read More »
Best Solution - Projects - Permanent Magnets

Permanent Magnets

Many permanent magnet materials exist today, with the most common being ceramic or ferrite materials, where reasonable performance at very low cost is required. Other

Read More »
Best Solutin - Projects - Best Solutin - Projects - MRI Magnetic Shielding

MRI Magnetic Shielding

Best Solution has assisted manufacturers of MRI scanner magnets using magneto-static finite element models. The models typically include the large superconducting magnet of the scanner

Read More »
Projects - Beamline Bending Magnet

Beamline Bending Magnet

The design of charged-particle beamlines requires close collaboration between beamline physicists, magnet designers and mechanical designers. Best Solution has been a key part of such

Read More »
Projects - AMS2 Physics Experiment

AMS2 Physics Experiment

The Alpha Magnetic Spectrometer (AMS) is the second such particle physics experiment to be launched into space and will include the first large superconducting magnet

Read More »
Projects - Magnetic Surgery

Magnetism in Surgery

Best Solution supported Oxford instruments in the development of a magnetic system designed for a pioneering surgical technique. The system would potentially allow surgeons to

Read More »
Projects - Actuators

Actuators

Best Solution has experience in the design and modelling of a wide range of electromagnetic actuators including linear actuators, torque motors, optical scanning motors, a.c.

Read More »
Best Sulution - Magnetic Linkages

Magnetic Linkages

Magnetic linkages are often designed into equipment where it is desirable to separate different sections of the same mechanism. This could be required for a

Read More »
Best Solutin - Projects - Thermal Imaging Actuator

Thermal Imaging Actuator

Our mechanical design services enabled Best Solution to design a high-performance scanning actuator for a military thermal imaging application. The actuator was capable of very

Read More »
Best Solution - Projects - Magnetic Sensors

Magnetic Sensors

Best Solution has assisted in the development of a variety of sensors employing magnetic effects of one sort or another. These include: Flux gate magnetometers

Read More »
Projects - Transformers

Transformers

Best Solution has a wealth of experience in the computer-aided engineering of inductors, transformers and other wound components. Using finite element based tools, we can

Read More »
Best Solutin - Projects - Induction Heating

Induction Heating

Induction heating processes are commonly used to harden, anneal and bond metals. Induction processes are attractive because they include the following advantages: * Induction heating

Read More »
Best Solution - Projects - Rotating Machines

Rotating Machines

Our finite element based techniques can provide invaluable support to designers of rotating machines, including the following tasks: Flux plots showing leakage, saturation and local

Read More »

Explore more projects by sector...

Best Solutin - Projects - Best Solutin - Projects - Pump Couplings

Pump Couplings

Magnetic rotary couplings are often used by pump manufacturers to isolate a motor from the pump components. The isolation of these components might be desirable

Read More »
Best Sulution - Magnetic Linkages

Magnetic Linkages

Magnetic linkages are often designed into equipment where it is desirable to separate different sections of the same mechanism. This could be required for a

Read More »
Best Solution - Projects - Rotating Machines

Rotating Machines

Our finite element based techniques can provide invaluable support to designers of rotating machines, including the following tasks: Flux plots showing leakage, saturation and local

Read More »
Projects - Induction Heating

Heat Exchangers

High thermal stresses can occur either as a result of temperature change in assemblies of materials of different expansion rates, or the kind of large

Read More »
Projects - Liquid Gas

Liquid Gas Handling

Dockside articulated loading arms are used to load and unload bulk supplies of liquid natural gas. The time taken for this operation is significantly affected

Read More »
Projects - Beamline Bending Magnet

Beamline Bending Magnet

The design of charged-particle beamlines requires close collaboration between beamline physicists, magnet designers and mechanical designers. Best Solution has been a key part of such

Read More »
Best Solutin - Projects - Induction Heating

Induction Heating

Induction heating processes are commonly used to harden, anneal and bond metals. Induction processes are attractive because they include the following advantages: * Induction heating

Read More »
Projects - Heat Exchangers

Pressure Vessels

Best Solution has assisted customers with the design of pressure vessels using parametric finite element models. This process is particularly well suited to irregularly shaped

Read More »
Best Solution - Projects - Magnetic Sensors

Magnetic Sensors

Best Solution has assisted in the development of a variety of sensors employing magnetic effects of one sort or another. These include: Flux gate magnetometers

Read More »
Best Solution - Projects - Permanent Magnets

Permanent Magnets

Many permanent magnet materials exist today, with the most common being ceramic or ferrite materials, where reasonable performance at very low cost is required. Other

Read More »
Best Solutin - Projects - Magnetising Fixtures

Magnetising Fixtures

In order to magnetise modern rare-earth magnets, large magnetic fields are required. The fields required are large enough to present some significant challenges to the

Read More »
Projects - Production Engineering

Production Engineering

Many permanent magnet materials exist today, with the most common being ceramic or ferrite materials, where reasonable performance at very low cost is required. Other

Read More »

Explore Best Solution Consultancy

Finite element based tools are used in a range of applications in magnetic design ranging from a simple static force prediction for a solenoid, to a magnetic-structural analysis of a superconducting magnet during a quench.

Sectors

Explore the range industry sectors and projects we have supported.

Capabilities

This section outlines our expertise in the field of engineering design services.

Benefits

Find out how Best Solutions can benefit your business processes.

Contact Us

Speak to us today to discuss your project or seek advice.

Latest Projects

Discuss a Project

We enjoy helping our customers with an increasingly broad spectrum of modelling tasks. These continue to present new challenges, and have helped us to build an experienced team and a powerful set of simulation techniques.