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Suzhou Firstall Electrical Machine & Technology Co., Ltd. is a leading Supplier of professional-quality power alternators/generators, Brushless Synchronous AC Alternator , ac generator ,as well as professional service on international trade. FIRSTALL markets its products and service its partner around the world from the office located in Suzhou and Wuxi city Jiangsu province, China.
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AC Generator with low noise claw tooth rotor
AC Generator with low noise claw tooth rotor
An AC generator for a vehicle comprises a rotor having a pair of finger magnetic poles and an armature iron core. By deviating pole pieces of the finger magnetic poles by predetermined angles relative to each of opposed tooth portions of the armature iron core, torque variation applied to each of the pole pieces during rotation is cancelled, and magnetic sound can be greatly decreased without reducing the output of the .
The present brushless alternator relates to AC generators for vehicles, more particularly to a multiphase, particularly three-phase, AC generator provided with a so-called Lundell type rotor comprising an exciting coil enclosed by a pair of finger magnetic poles having a plurality of pole pieces, respectively. Such a generator is chiefly installed on vehicles, with the rotor driven by an engine thereof.
As is well known in the art, brushless alternators(hereinafter simply referred to as ACG) as described above generally have a basic construction such as shown in FIG. 1. In FIG. 1, reference numeral 1 designates an armature iron core of a cylindrical shape, and reference numeral 2 designates three-phase armature windings wound about the iron core 1. The armature assembly comprising these elements is supported within two housings H. Reference numeral 3 designates a three-phase full wave rectifier unit contained in one of the two housings H, for converting the output of the armature windings 2 into DC current.
According to the present brushless ac generator, in order to decrease the magnetic sound which is generated due to the torque variation, at least two pole pieces of at least one of a pair of finger magnetic poles are arranged so as to be deviated relative to the opposed tooth portions of the armature iron core which are arranged at an equal pitch, so that the pole pieces may be passed through the tooth portions of the armature iron core irregularly, when the rotor is rotated. As a result, the torque variation having a fundamental frequency TN and the integral order harmonics thereof, can be sharply decreased and the magnetic sound generated due to the torque variation can be greatly reduced.
Having now fully described the AC generator, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the invention as set forth herein.
An AC generator for a vehicle comprises a rotor having a pair of finger magnetic poles and an armature iron core. By deviating pole pieces of the finger magnetic poles by predetermined angles relative to each of opposed tooth portions of the armature iron core, torque variation applied to each of the pole pieces during rotation is cancelled, and magnetic sound can be greatly decreased without reducing the output of the .
The present brushless alternator relates to AC generators for vehicles, more particularly to a multiphase, particularly three-phase, AC generator provided with a so-called Lundell type rotor comprising an exciting coil enclosed by a pair of finger magnetic poles having a plurality of pole pieces, respectively. Such a generator is chiefly installed on vehicles, with the rotor driven by an engine thereof.
As is well known in the art, brushless alternators(hereinafter simply referred to as ACG) as described above generally have a basic construction such as shown in FIG. 1. In FIG. 1, reference numeral 1 designates an armature iron core of a cylindrical shape, and reference numeral 2 designates three-phase armature windings wound about the iron core 1. The armature assembly comprising these elements is supported within two housings H. Reference numeral 3 designates a three-phase full wave rectifier unit contained in one of the two housings H, for converting the output of the armature windings 2 into DC current.
According to the present brushless ac generator, in order to decrease the magnetic sound which is generated due to the torque variation, at least two pole pieces of at least one of a pair of finger magnetic poles are arranged so as to be deviated relative to the opposed tooth portions of the armature iron core which are arranged at an equal pitch, so that the pole pieces may be passed through the tooth portions of the armature iron core irregularly, when the rotor is rotated. As a result, the torque variation having a fundamental frequency TN and the integral order harmonics thereof, can be sharply decreased and the magnetic sound generated due to the torque variation can be greatly reduced.
Having now fully described the AC generator, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the invention as set forth herein.