Improved electric machine for use as a starter generator for an internal combustion engine
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A technology for generators and internal combustion engines, which is applied to the starting of engines, the starting of motors for engines, machines/engines, etc. It can solve the problems of increasing copper loss, rotor vibration, noise, etc., and achieves reduced copper loss, reduced rotor vibration, and smooth start sexual effect
Active Publication Date: 2020-04-07
TVS MOTOR CO LTD
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Problems solved by technology
Although a starter-generator with this design is able to achieve high starting torque due to the reduced effective line-to-line resistance, the unbalance of back EMF generated in each set of circumferentially separated coils due to rotor unbalance will cause Circulating current with parallel connected coil sets and increased copper loss
Imbalances in the stator coil currents can also cause rotor vibrations, which in turn can cause unpleasant noises if matched to the resonant frequency of the connected components
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[0027] figure 1 A front view of the electric machine 100 is shown. The electric machine 100 includes an outer rotor 20 for connection to an engine crankshaft (not shown). The rotor 20 has a plurality of permanent magnets 30 arranged around its inner circumference in an alternating north-south pole pattern. A stator 40 including a plurality of stator teeth 40T arranged concentrically with the rotor 20 is separated from the rotor 20 by a small air gap, and the stator 40 is connected to an engine crankcase (not shown). The stator teeth 40T carry the magnetic flux generated by the permanent magnets 30 . In addition, stator coils 50 are wound around the stator teeth 40 for carrying current during the starting mode of operation and for generating voltage during the generating mode of operation. The crankshaft position sensor 60 is mounted to the engine crankcase outside the outer circumference of the rotor 20 to sense the ferromagnetic protrusion 70 provided on the outer circumfe...
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Abstract
The invention provides a motor (100) with a stator (40). The stator comprises multiple teeth (40T) divided into two or more sequence regions (A, B, C). A stator winding (90) comprises three phases connected in a triangular manner, and is wound to the teeth (40T). Each phase of the stator winding is equipped with two or more parallelly connected coil groups formed by serially connected coils ((1, 13, 7), (10, 4, 16), (2, 14, 8), (11, 5, 17), (12, 6, 18), (3, 15, 19)). The two or more coils ((1, 13, 7), (10, 4, 16), (2, 14, 8), (11, 5, 17), (12, 6, 18), (3, 15, 19)) are wound to two groups or more groups of teeth (40TS). At least one tooth from the two groups or more groups of the teeth (40TS) is selected from each sequence region of the two or more sequence regions (A, B, C).
Description
technical field [0001] The present invention relates to an improved electric machine for use as a starter generator for an internal combustion engine. Background technique [0002] From US1770468 is known a single electric machine which functions as an electric motor for starting the internal combustion engine and a generator for charging the vehicle battery. However, this machine uses brush sections and commutator sections, which reduces durability, and the machine requires a complex gear system to interface with the engine crankshaft. [0003] US 3902073A titled "Starter generator electrical system utilizing phase controlled rectifiers to drive a dynamoelectric machine as a brushless dc motor in the starter mode and to provide frequency conversion for a constant frequency output in the generating mode" discloses a starter generator motor, which It is driven as a brushless motor by using a rotary converter during starting operation. Nevertheless, this machine has field wi...
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Application Information
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