Starting brushless DC magnetor for motorcycle

Abstract

The invention discloses a DC brushless starting magnetor used in motorcycle. The magnetor includes bottom seat of electrical motor, flywheel of out rotor, rotating shaft, internal stator and startingdriving circuit. Cheap material of ferrite magnet steel is adopted in the invention. Three-phase starting coil group with spanning slots and integral interval as well as single-phase coil of generating electricity with spanning slot and integral interval is installed in the coil slot of internal stator. In said three-phase coil and under each pole, the coils with same phase have same turn number and are laid on layers in same slot, and the connection between coils is in parallel or in serial. Out of phase coils are laid on layers in different slot in sequence, and the connection between coilsis in parallel or in serial. Number of turns in serial of each parallel branch circuit in each phase coil is equal. Said single-phase coil is located on outside layer of said three-phase coil. The connection between single-phase coils is in serial. The invention reduces cost greatly, but without reducing starting performance of electrical motor so as to provide good economical effect.

Description

technical field [0001] The invention belongs to motorcycle electrical appliances, in particular to a DC brushless starter magneto for motorcycles. Background technique [0002] At present, the starter motor and the magneto on the electric starter motorcycle are two independent motors respectively. The starter motor is a brushed permanent magnet DC motor with a high operating speed, but it needs to be connected to the engine shaft through a reduction mechanism and an overrunning clutch. The outer rotor flywheel of the magneto is directly connected with the engine shaft to generate electricity and provide an ignition trigger signal for the engine ignition system. When the starter motor starts the motorcycle engine, first of all, the structure is complicated because it is connected with the engine shaft through the deceleration mechanism and the overrunning clutch; secondly, when the overrunning clutch slips, it will seriously affect the starting ...

AI Technical Summary

Problems solved by technology

Although the production and processing technology of the motor is simple, the actual span of the winding is 120° electrical angle, and the winding coefficient is low; the flat top part of the basic electromagnetic torque trapezoidal wave of each phase winding has a maximum width of 60° electrical angle, and the synthesis of the three-phase winding is basically The electromagnetic torque ripple is large, and the reluctance torque is superimposed. The difference between the maximum electromagnetic torque and the minimum electromagnetic torque is nearly double. In order to make the minimum starting torque greater than the specified value, expensive NdFeB magnets have to be used. tile material, so the cost of the motor is high, but its performance is not good

Images