He needs to back off. If there was a scary monster in the house with me and someone lifted me up and put me in it's arms, I'd be petrified. Not that I'm saying that your husband is a scary monster, of course!
If I were him, I'd only be giving the odd low-key friendly greeting, and not approaching her but letting her approach me. I would eat something delicious and strong-smelling, and occasionally say her name and throw some in her direction. After a while, she should look up expectantly when he says her name. He could then throw the treat a little less far, so she has to approach just by a foot - then gradually reduce the distance until he can hand her the treat. He could even try smearing something like peanut butter or liver paste on his hand so she will stay by him longer as she licks it off. But he needs to go at her pace - if she's taking the food and darting away then he needs to go back to throwing it to a distance she's comfortable with.
he has to move around the house, of course, and he may just have to ignore her barking. But I would suggest, as soon as he does something that signals he's going to move (does it make a sound when powered up, or he could move it just an inch?), he throws a treat for her in a direction away from the chair. This could work on two levels - she learns that him starting up the chair is a good thing, and he is moving her into a position where she can feel more comfortable when he moves.
Don't expect quick results - if there's no instant improvement, keep it up and look back after a week or so and see if you've made any progress at all.
I'm not an expert - others may have better ideas - but hope that helps
