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A brushless DC electric motor (BLDC), also known as an electronically commutated motor, is a synchronous motor using a direct current (DC) electric power supply. It uses an electronic controller to switch DC currents to the motor windings producing magnetic fields that effectively rotate in space and which the permanent magnet rotor follows.
The LightSpeed (1990) and Flash (1991) were prototypes that followed the lightweight, efficiency-focused principles of the SEVT cars designed by Worden, and were campaigned in the American Tour de Sol. [10] [11] The LightSpeed was equipped with solar panels generating 200 W (0.27 hp) and driven by two 30 hp (22 kW) electric traction motors; it ...
The motor used a two-pole brushless rotor with a digital controller. Dyson said its efficiency was 84%, which was less than the 96% efficiency that is achieved in some brushless designs. [citation needed] In order to deal with the high speed and centrifugal forces, the impeller is made of carbon fibre reinforced polymer; the shaft is steel. [3]
Some boats use AC motors or permanent magnet brushless motors. The advantages of these are the lack of commutators which can wear out or fail and the often lower currents allowing thinner cables; the disadvantages are the total reliance on the required electronic controllers and the usually high voltages which require a high standard of insulation.
The Deltic story began in 1943 when the British Admiralty set up a committee to develop a high-power, lightweight diesel engine for motor torpedo boats. [1] Hitherto in the Royal Navy, such boats had been driven by petrol engines, but their highly flammable fuel made them vulnerable to fire, unlike diesel-powered E-boats.
In a power-split hybrid electric drive train, there are two motors: a traction electric motor and an internal combustion engine. The power from these two motors can be shared to drive the wheels via a power split device, which is a simple planetary gear set. The ratio can be from 100% for the combustion engine to 100% for the traction electric ...
High-power, brushless axial motors are more recent, but are beginning to see usage in some electric vehicles. [8] One of the longest produced axial motors is the brushed DC Lynch motor, where the rotor is almost entirely composed of flat copper strips with small iron cores inserted, allowing power-dense operation.
The stationary (stator) windings of an outrunner motor are excited by conventional DC brushless motor controllers. A direct current (switched on and off at high frequency for voltage modulation) is typically passed through three or more non-adjacent windings together, and the group so energized is alternated electronically based upon rotor position feedback.
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