Exro has developed and patented a unique method of “self-optimizing” electric motors and generators to reduce losses in high variability applications. Our first commercial application is wind power, where we are collaborating with numerous turbine makers to convert their existing geared turbines to direct-drive using our Variable Input Electrical Generator (VIEG).
The benefit is an immediate increase in the turbine’s annual output along with a significant reduction in downtime and annual maintenance. In addition to wind power, our technology platform has a compelling value proposition for run of river and marine power, as well as electric vehicles, industrial motors, portable power and other inherently variable applications where reducing losses equates to a material economic benefit.
The technology platform that Exro has developed involves a uniquely designed rotating electromagnetic machine that is customized to deliver optimum efficiency for each individual application. The rotating machine can be seen as an electromagnetic platform, and for that reason the overall technology is referred to as a Controlled Induction Platform (CIP). Physically, the electromagnetic machine consists of copper wire, permanent magnets (can also be configured to use electro magnets) and laminated metal plates configured in a way that is completely unique when compared to a traditional electrical motor or generator. In practice, a single CIP is actually a collection of many electromagnetic machines inside a single housing, creating an unprecedented ability to right size the machine to match the available input energy (as a generator), output load (as a generator) or output torque or speed (as a motor).
The VIEG (Variable Input Electrical Generator) is the name for the CIP when it is deployed as an electrical generator. The multi-stack, VIEG works in any situation where there is a need to convert kinetic energy into electrical energy, but it is particularly beneficial in situations where the input energy source is variable, as with alternate energy applications (wind / tide / wave / run of river etc.).
Virtually all renewable energy power plants (with the exception of direct solar) require an electrical generator and have a variable energy source. If the VIEG is substituted for a traditional generator in a wind turbine (also applies to wave, tide, run of river etc.) the turbine will produce more electrical energy out of the same amount of available wind. Output increases will vary depending on plant configuration and site, but double digit increases can be expected. In addition, since the VIEG geometry and circuitry can be configured to adapt to the input energy source, the need for a mechanical gearbox is eliminated which eliminates friction losses. For a 3 stage gearbox, this is losses of 6% to 10% in many cases and also drives down the overall capital cost and nacelle weight.
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