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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 group stemmed from a joint venture set up in May 1967 between Robert Bosch GmbH (Stuttgart) and Siemens AG (Munich), and it posted annual sales of 14.8 billion euros in the year 2023. [2] BSH is an acronym for B osch und S iemens H ausgeräte .
A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source and utilizing an electric brush for contact. ...
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.
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.
It is possible to avoid the multiphase slip ring assembly, but there are problems with efficiency, cost and size. A better alternative is a brushless wound-rotor doubly fed electric machine. [12] Principle of a double-fed induction-generator connected to a wind turbine