A traditional motor for a washing machine has been a 'universal' motor with carbon brushes, speed control provided by a Thyristor Voltage controller. The result is reliable apart from brush replacement after some years and black dust inside the enclosure. The 'Inverter Motor' is a 3 phase device using a combination of permanent magnets an bars within the rotor, with no carbon brushes or commutator. Speed control provided by an 'Inverter', converting a single phase supply into a variable 3 phase supply frequency, for the 'speed' control and reverse.
Assuming this machine is for a boat with supply derived from an inverter, then it all gets a bit 'nebulous' as installations are created from a variety of line side components, making the single phase ac from a 12 DC, to be 'mashed about' by the drive system in the washing machine??
The are some success stories here which are useful, but there is a measure of luck getting a working combination; not much help I am afraid but I hope useful?