The grades of three electrical equipment stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Allied Motion Technologies (AMOT) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Allied Motion Technologies is engaged in the business of designing, manufacturing and selling motor, servo motion and optical encoder products to a spectrum of customers throughout the world. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Equity, Cash Flow and Sales Growth, AMOT also gets A’s. For more information, get Portfolio Grader’s complete analysis of AMOT stock.

This is a strong week for Highpower International, Inc. (HPJ). The company’s rating climbs to A from the previous week’s B. Highpower International develops and manufactures nickel metal hydride and lithium-ion rechargeable batteries and related products. For more information, get Portfolio Grader’s complete analysis of HPJ stock.

Capstone Turbine Corporation’s (CPST) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Capstone Turbine is a developer, manufacturer, marketer, and service provider of microturbine technology solutions that are used in stationary distributed power generation applications. For more information, get Portfolio Grader’s complete analysis of CPST stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.