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    • 10. 发明授权
    • Brushless DC motor
    • 无刷直流电机
    • US07058291B2
    • 2006-06-06
    • US09755330
    • 2001-01-05
    • J. Michael WeaverAris C. CleanthousChristopher R. YahnkerBhanuprasad V. GortiRichard T. Walter
    • J. Michael WeaverAris C. CleanthousChristopher R. YahnkerBhanuprasad V. GortiRichard T. Walter
    • H02P6/00
    • H02K1/28H02K3/47H02K5/124H02K5/15H02K5/161H02K7/083H02K9/06H02K15/00H02K15/02H02K15/12H02K21/14H02K29/08H02P6/21Y10S388/937
    • A system and method for reducing the cost of producing a brushless DC motor (58) is presented. The brushless DC motor (58) provides higher power density and efficiency with an increased tool run time. The brushless DC motor (58) includes a rotor assembly (72) that has an unmagnetized permanent magnet (74) affixed to a shaft. The permanent magnet (74) remains unmagnetized until the motor is partially assembled. A plurality of coils (94) for producing a magnetic field are wound about the rotor assembly (72). The coils (94) include end turns that enclose the rotor assembly (72) such that the rotor assembly (72) is not removable. Since the windings (94) are wound with the rotor assembly (72) already enclosed, the windings (94) do not require large end coils to allow subsequent insertion of the rotor (72). Minimizing the end coils reduces the length of wire required per turn, thereby reducing the resistance of the winding (94). Also, since the permanent magnet (74) is unmagnetized when the coils (94) are wound around the rotor assembly (72) the winding process is simplified by not coupling energy into the wire which would influence the winder operation. The wound assembly is inserted into a stator stack (96) comprised of magnetic material that provides a magnetic flux return path for the magnetic flux generated by the permanent magnet (74). Using an unmagnetized permanent magnet (74) facilitates easy insertion of the wound assembly into the stator stack (96), reduces the accumulation of magnetic debris during the manufacturing process, and permits the motor assembly to be sealed prior to magnetizing the permanent magnet (74).
    • 提出了一种用于降低生产无刷直流电动机(58)的成本的系统和方法。 无刷直流电动机(58)通过增加的工具运行时间提供更高的功率密度和效率。 无刷直流电动机(58)包括具有固定在轴上的非磁化永磁体(74)的转子组件(72)。 永磁体(74)保持不磁化,直到电机部分组装为止。 用于产生磁场的多个线圈(94)缠绕在转子组件(72)上。 线圈(94)包括围绕转子组件(72)的端匝,使得转子组件(72)不可拆卸。 由于绕组(94)与已经封闭的转子组件(72)缠绕,绕组(94)不需要大的端部线圈以允许转子(72)的后续插入。 使端部线圈最小化可减少每圈所需的导线长度,从而降低绕组(94)的电阻。 此外,由于当绕组(94)卷绕在转子组件(72)上时永磁体(74)不被磁化,所以通过不将能量耦合到将影响络纱机操作的导线中来简化卷绕过程。 卷绕组件被插入到由磁性材料构成的定子叠层(96)中,该磁性材料为由永磁体(74)产生的磁通提供磁通返回路径。 使用非磁化永磁体(74)有助于将缠绕组件容易地插入定子堆(96)中,减少制造过程中磁碎屑的累积,并允许电动机组件在磁化永磁体(74)之前被密封 )。