MOTOR ASSEMBLY COMPRISING A BRUSHLESS DC MOTOR WITH CONTROL ELECTRONICS
First Claim
1. A motor assembly, comprising a brushless DC motor with control electronics, wherein said control electronics comprises at least two magnetic field sensors adapted to measure magnetic flux from magnetic poles on a rotor in said brushless DC motor, and wherein said magnetic field sensors are adapted to determine an angular position of said rotor, based on said measurement of magnetic flux, with the purpose of controlling the current to said brushless DC motor based on said determined angular position,wherein the brushless DC motor is an external rotor motor, comprising an internal stator and an external rotor,that said external rotor has a periphery and an inside, exhibiting a plurality of permanent magnets,wherein said permanent magnets are disposed at regular intervals along said inside to provide said magnetic poles, andwherein said at least two magnetic field sensors are disposed at a distance from each other in the proximity of said periphery to measure said magnetic flux leaking radially through said external rotor from said permanent magnets on said inside, andsaid control electronics comprises at least one planar circuit board oriented tangentially to the periphery of said external rotor, wherein said at least two magnetic field sensors are mounted on said circuit board.
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Abstract
A motor assembly (101), comprising a brushless DC motor (102) with control electronics (103) which comprises at least two magnetic field sensors adapted to measure magnetic flux from magnetic poles on a rotor in the brushless DC motor (102). The magnetic field sensors are adapted to determine an angular position of the rotor, with the purpose of controlling the current to the brushless DC motor based on the determined angular position. The brushless DC motor is an external rotor motor (102) comprising an internal stator (104), and an external rotor (105) having a periphery (106) and an inside (107), which exhibits a plurality of permanent magnets (108, 109, 110, 111) disposed at regular intervals along the inside (107) to provide the magnetic poles. The magnetic field sensors (112, 113) are disposed at a distance from each other in the proximity of the periphery (106) to measure the magnetic flux leaking radially through the external rotor (105) from the permanent magnets (108, 109, 110, 111) on the inside (107).
15 Citations
15 Claims
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1. A motor assembly, comprising a brushless DC motor with control electronics, wherein said control electronics comprises at least two magnetic field sensors adapted to measure magnetic flux from magnetic poles on a rotor in said brushless DC motor, and wherein said magnetic field sensors are adapted to determine an angular position of said rotor, based on said measurement of magnetic flux, with the purpose of controlling the current to said brushless DC motor based on said determined angular position,
wherein the brushless DC motor is an external rotor motor, comprising an internal stator and an external rotor, that said external rotor has a periphery and an inside, exhibiting a plurality of permanent magnets, wherein said permanent magnets are disposed at regular intervals along said inside to provide said magnetic poles, and wherein said at least two magnetic field sensors are disposed at a distance from each other in the proximity of said periphery to measure said magnetic flux leaking radially through said external rotor from said permanent magnets on said inside, and said control electronics comprises at least one planar circuit board oriented tangentially to the periphery of said external rotor, wherein said at least two magnetic field sensors are mounted on said circuit board.
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7. (canceled)
Specification