Andre Previn, unhappy with his limited role in the Royal Philharmonic Orchestra and wanting to spend more time in America, will resign next year as principal conductor, the company said Thursday.

Previn, who turns 62 on Saturday, will not be replaced when he leaves the company in July 1992, said spokesman Bruce Jefferson.Four years ago, Previn relinquished the post of musical director to Vladimir Ashkenazy, which gave Ashkenazy the first choice of music to be performed by the company.

"Ashkenazy is so hard-working and has expanded his own repertoire so much that the role of principal conductor separate from music director has ceased to be as significant as it was," said a statement by the orchestra.

Previn introduced the Russian pianist to the Royal Philharmonic during his own tenure as musical director from 1985 to 1987.