Unless there's something in your brief that stipulates the use of the word "motors", I'd drop it altogether. It may be a part of the Company name, but it shouldn't form a part of the brand IMHO. If you have to remind your punters what you're selling, your brand isn't strong enough in the first place. McDonalds don't use the word "burgers" in their brand, likewise Apple is just Apple, not "Apple Electronics". Dropping the extraneous word should open up some design options by reducing the complexity.
