Fractional horsepower motors produce less than 746 watts and are used in small consumer devices, automotive ancillary devices, and high precision tasks. Stepper and servo motors are used for sensitive input and high accuracy tasks, but are more expensive than conventional fractional horsepower engines.
A fractional horsepower motor is one that produces less than 746 watts in operation; it is an engine whose total horsepower does not quite meet the 1 horsepower standard. It is so named because an engine that produces so little horsepower cannot be rated by the conventional horsepower diagram. There is no minimum horsepower rating to be considered a fractional horsepower engine; for that reason, it’s the bottom floor in power ratings, with no real rating below it. A substantial benefit to running a fractional horsepower engine is that it is exempt from some laws governing more powerful engines, such as the US Energy Power Act of 2005, along with similar directives in the European Union.
The primary use of fractional horsepower motors is to power small consumer and electronic devices such as vacuum cleaners, refrigerators, and washing machines. Additionally, these motors are found in automotive ancillary devices, such as power windows, power seats, moonroofs, sunroofs, and windshield wipers; approximately 35% of all fractional horsepower engine sales can be attributed to automobiles. These engines make the devices they supply completely independent of the actual engine of the motor vehicle; even if the car’s main engine stops running, the fractional horsepower engines in the vehicle can still run, as long as the car still has a functioning electrical system.
In addition to their use in general consumer goods, fractional horsepower engines are used in commercial and commercial applications for work requiring a high degree of accuracy. A fractional horsepower engine does not produce as much vibration as conventional high horsepower engines. This allows for more controlled use in high precision tasks.
Stepper motors and servo motors are the specific types of fractional horsepower motors used in these cases; both are specialized engines that allow for a sensitive level of input. Due to their sensitive nature and high degree of accuracy – when paired with a planetary gearbox, these types of motors can be accurate up to 2/15th of a degree – stepper motors and servo motors are often priced higher than their counterparts. Conventional fractional horsepower engines seen in most consumer goods. For this reason, their use is limited to more exclusive fields. Robotics is one of the main ways these types of high quality motors are used.
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