Siemens researchers have developed a new type of electric motor that, with a weight of just 50 kilograms, delivers a continuous output of about 260 kilowatts – five times more than comparable drive systems. The motor has been specially designed for use in aircraft. Thanks to its record-setting power-to-weight ratio, larger aircraft with takeoff weights of up to two tons will now be able to use electric drives for the first time. To implement the world-record motor, Siemens' experts scrutinized all the components of previous motors and optimized them up to their technical limits. New simulation techniques and sophisticated lightweight construction enabled the drive system to achieve a unique weight-to-performance ratio of five kilowatts (kW) per kilogram (kg). The electric motors of comparable strength that are used in industrial applications deliver less than one kW per kg. The performance of the drive systems used in electric vehicles is about two kW per kg. Since the new motor delivers its record-setting performance at rotational speeds of just 2,500 revolutions per minute, it can drive propellers directly, without the use of a transmission.
The key to electric plane performance is still the energy density of the batteries or other power storage. The weight of the batteries tends to outweight the motor by about one hundred to one.
Industrial electric motors used in heavy machinery that produce less than 1 kW per kilogram, or even to more efficient electric motors for vehicles that generate around 2 kW per kilogram.
Emrax electric motors claim about 8 to 10 KW per kg. It would be interesting to know if all power and weight metrics are being consistently specified.
EMRAX motor is a completely new type of pancake axial flux brushless synchronous three phase AC (Alternating Current) electric motor. It can also work as a generator - technical data are the same - either EMRAX is used as a motor or as a generator.
March 2015: Prototype EMRAX 348 is cooming (1200 Nm /350 kW at 3000 RPM, weight 42 kg, diameter 348 mm, length 107 mm, IP65). First prototype will be ready for testing in next few months. Also we are preparing documentation for EMRAX 348T, which can deliver power 600 kW, torque 2400 Nm, weight 70 kg, dimensions: dia 348 mm length 170 mm.
Here is an Emrax electric motor manual
Here are some tables of power to weight ratio for non-electric and electric motors
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Reposted via Next Big Future
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