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What Your Appliance Will Be Running On In The Future
Look around your house and you are likely to find a large number of electric motors. There is probably one in every appliance, from the hand mixers in the kitchen to the lawn mower fixing up the front yard. These days, electric motors are found in just about every room of the house.
Generally, the motors fall into one of three types. Brush motors are the most traditional and provide the highest torque with their variable speed operation. Brushless motors use induction to create spin. They are silent, sturdy and last for years. A third type uses microcontrollers and new magnet technology to offer the best of both worlds: a quiet, sturdy motor that provides variable torque.
Micro controllers have long been used for the interface functions of modern appliances. They are just now beginning to be used to control the motors themselves. The advantages in energy savings, silent operation and simplicity are becoming more and more important as technology advances and our ecological needs increase.
In applications such as drills, vacuum cleaners, mowers and even the Poulan chainsaw, variable speed is the key. Controlling the speed can increase power efficiency by as much as 30 percent compared to fixed-speed units. Designers can also use smaller, less-expensive motors, lowering the overall price.
For large motors, like those used in washing machines, the microcontrollers are not a viable solution. The controllers are just too expensive. Instead, these motors are built with the new permanent magnet technology. They run at variable speeds, they run quietly, they don't produce much waste heat and they save energy. They save water, too!
It is easy to see why permanent magnet motors are gaining in popularity. They also use less raw materials. Less copper and steel mean lower cost and lower costs mean lower prices. Not only is the market price not as influenced by the price of commodities, but as their popularity grows, these motors will get less and less expensive. They are already used to vibrate cell phones and power cars.
They won't work in every appliance: your Homelite chainsaw, for example, will probably always run on gas. But this motor will make an appearance in many other places, like drills and refrigerators. They have the high torque and multiple speeds of traditional brush motors combined with the silent sturdy build of the brushless motors. A match made in heaven!
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