Ring-shaped electromagnet and electromagnetic force in the air gap (the direction of the current crossing the air gap is into the page of the drawing).
Magnetic field over the cross section midway in the air gap (in the simulation, the core material of the electromagnet is silicon steel, the electromagnet coil has 200 turns carrying current of 0.5 A, and the air gap cross-sectional area is about 15 mm × 15 mm, with 2 mm width).
Schematic diagram of mass balance to measure the Ampere force.
Schematic diagram of thrust stand.
Output signal of PSD (I = 0.0993 A).
Signal generator pulse and PSD signal (pulse time is 0.1 s, impulse is about 70.8 μN s).
Experiment results of Ampere force and copper wire current.
Static force calibration.
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