The M-MRW magnetiser range is relay logic controlled with
adjustable voltage up to a maximum of 400V
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 400 volt output.
Typical energy outputs for the M-MRW series span from 4kJ
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 400 volts in this case) and this
stored energy is then discharged by a ignitron 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.
The M-MRW range of magnetisers feature an integrated safety cabinet to protect the operator from the magnetiser voltages and any potential projectiles caused by a failed part being reworked. When the cabinet is opened the magnetiser automatically dumps the capacitor bank energy for safety. The operator simply connects the motor to the output clamps and closes the door. The magnetiser will automatically charge to voltage.
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
The M-MRW series features an easy to use control
panel that includes:
Three Buttons Operation Control
Pulse (Green) – to discharge the magnetisr into the motor
Abort (Red) – to abort the current sequence and place the magnetiser in dump
Voltage adjust pot – to set required voltage.
Analogue voltage sisplay – shows the current voltage level.
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.