Hi All,
I would like to introduce my new energiser. It is based on JB’s original machine FEG 1984, sometimes erroneously called the ‘Watson Machine’.
Specification:
Motor: MFA 800 12VDC Permanent magnet motor. Efficiency 58%
Shaft: Steel diameter 12mm
Bearings: ID 12mm OD 28mm Thk. 8mm open. Lubricated with baby oil.
Flywheel: Plastic wheel with two aluminium plates for extra mass.
Rotor: Aluminium, diameter140mm with 6 neodymium N42 magnets diameter 20mm x 10mm thick on a 100mm-pitch diameter.
Coils: 6 air coils at 2000 turns of copper magnet wire 0.40mm (AWG #26)
Rotating mass: 1.70kg
Speed: 4725RPM (Non pulsed & without coils)
Current: 2.04A (Non pulsed & without coils)
Rundown: 67s
Variable Cap. 200pF 5kV
I have tried to follow the design of JB’s original machine as I think this gives greater scope for modifications.
For the motor pulsing system I am using an op amp and opto reflective switch which I have tested driving a mosfet and a bipolar transistor.
For the energiser switching system I am planning to use the other half of the op amp and bipolar transistors.
The 6 coils in series produce a nice sine wave with a peak of around 220V. With the limited capacitors in my spares box I am getting voltages off the scopes display.
With this set-up the motor pulls around 19A on start-up. So I have added a two position switch with a resistor so that on start-up the motor pulls 8A non pulsed the second switch position then gives a pulsed full current.
This is the part of the circuit that I am happy about, I need to do further tests with the energiser switch.
If anyone has got a working circuit for the energiser switch please feel free to chip in.
For the future I have started making a widow motor to replace the permanent magnet motor.
Best regards
Peter
I would like to introduce my new energiser. It is based on JB’s original machine FEG 1984, sometimes erroneously called the ‘Watson Machine’.
Specification:
Motor: MFA 800 12VDC Permanent magnet motor. Efficiency 58%
Shaft: Steel diameter 12mm
Bearings: ID 12mm OD 28mm Thk. 8mm open. Lubricated with baby oil.
Flywheel: Plastic wheel with two aluminium plates for extra mass.
Rotor: Aluminium, diameter140mm with 6 neodymium N42 magnets diameter 20mm x 10mm thick on a 100mm-pitch diameter.
Coils: 6 air coils at 2000 turns of copper magnet wire 0.40mm (AWG #26)
Rotating mass: 1.70kg
Speed: 4725RPM (Non pulsed & without coils)
Current: 2.04A (Non pulsed & without coils)
Rundown: 67s
Variable Cap. 200pF 5kV
I have tried to follow the design of JB’s original machine as I think this gives greater scope for modifications.
For the motor pulsing system I am using an op amp and opto reflective switch which I have tested driving a mosfet and a bipolar transistor.
For the energiser switching system I am planning to use the other half of the op amp and bipolar transistors.
The 6 coils in series produce a nice sine wave with a peak of around 220V. With the limited capacitors in my spares box I am getting voltages off the scopes display.
With this set-up the motor pulls around 19A on start-up. So I have added a two position switch with a resistor so that on start-up the motor pulls 8A non pulsed the second switch position then gives a pulsed full current.
This is the part of the circuit that I am happy about, I need to do further tests with the energiser switch.
If anyone has got a working circuit for the energiser switch please feel free to chip in.
For the future I have started making a widow motor to replace the permanent magnet motor.
Best regards
Peter
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