Motors are a bit funny. When they start, they present a very low resistance,
allowing the current to rush in and create the field that starts the motor -
when the field is created, the field provides opposition to the current
coming in so that the motor runs at the designed speed and draws the
appropriate amount of current.
When a motor is slowed down by a load, this field weakens and more current
flows through the wire - sometimes many times as normal. My bet is, at this
point, your inverter sags, cycles of power are missed, the motor stops. Your
inverter recovers, pushes the motor a bit, sags again, recovers, yada yada
But if it once worked and now doesn't, bearings and raceways and gears can
be causing more resistance - or perhaps you have corrosion in the circuit
supplying the inverter.
Good luck and 73,
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