Both magnetiser ranges are fully microprocessor
controlled with adjustable voltage from 50v to maximum (in 1v steps)
with feedback via a digital display. The microprocessor controls the
charging and discharging of the machine ensuring that the charging is
managed in a way to reduce the initial charge current that
non-microprocessor systems may not have. The microprocessor also
performs fault monitoring for system protection.
Each magnetiser is fitted with an internal dump resistor
to discharge the main capacitors in power down or abort mode, ensuring
a safe environment for both operator and machine.
The M series is based upon electrolytic capacitor
technology and is ideal for low and medium production rates and
excellent for servicing applications (such as motor repairs, etc.).
Capacitors are normally configured for a maximum voltage
of 760 – 800 volts, but can be configured for a 400 volt output.
Typical energy outputs for the M series span from 750J
The Ma series is based on non-polarised capacitors
technology that allows high peak current output at low and medium
production rate. An application example for this series of magnetisers
includes their use in multi-pole magnetising of rare earth magnets.
Capacitor voltages of up to 3,000 volts are available in
the Ma range.
Typical energy outputs for the Ma series span from 100J to 20kJ.
Principles of operation
In most applications the required current is too large
to be directly driven from the mains and/or the fixtures
inductance/resistance is such that not enough current would flow to
produce the required magnetic field. A capacitor bank is, therefore,
charged to the required voltage level (up to 3,000 volts) and this
stored energy is then discharged by a thyristor into the fixture to
produce the required magnetic field.
In a magnetising operation a clamp or freewheel diode is
placed across the fixture to ensure no reverse energy charges the
capacitor bank negative. All the energy is dissipated into the fixture
as a magnetisation pulse.
Ignitron outputs will be offered instead of the standard
semiconductor devices if the peak current is exceedingly high and/or
the rise time of the pulse is very short. Ignitrons may also be offered
for machines where the fixture is “unknown” i.e. motor rewind machines
or where fault conditions are expected that could damage semiconductor
Both M and Ma series features an easy to use control
panel that includes:
Four Buttons Operation Control
Pulse (Green) – to initiate a magnetisation cycle
Abort (Red) – to abort the current sequence
Up and Down (Yellow) – allows the adjustment of
Dot Matrix Display – shows the current voltage level,
status and error messages.
Key switch – available as an option to lock the
An optional PLC interface is also available.
The magnetiser energy will be selected to meet the
requirements of the application and will be dependent on the fixture
design. Typically, due to the high cost of energy storing capacitors,
the higher the energy needed to satisfy the magnetising application,
the higher the cost of the magnetiser.