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    • 8. 再颁专利
    • Brushless direct current motor
    • 无刷直流电机
    • USRE36860E
    • 2000-09-12
    • US710734
    • 1996-09-20
    • Rolf Muller
    • Rolf Muller
    • H02P6/14
    • H02P6/14
    • The stator winding of a brushless D.C. motor receives two current pulses per 360.degree.-el. of rotor rotation, each current pulse being furnished via a respective current path. Each current path contains at least one power transistor switch having conductive and non-conductive states. These states are determined by respective driver transistor switches; when the driver transistor switch is in a high-output-impedance state the respective power transistor switch is rendered conductive, but when in the low-output-impedance state it renders the power transistor switch non-conductive. In various ways disclosed herein measures are taken to prevent the power transistor switches of both current paths from being simultaneously conductive. This may be accomplished using inherent or discrete base-emitter capacitances so connected that a power transistor switch is switched off abruptly but switches-on only after the elapse of a predetermined delay. Alternatively, the Hall voltage produced by the motor's rotor-position-sensing Hall cell may be applied to comparators such that the power transistor switches are not even commanded to conduct except during respective periods each shorter than 180.degree.-el.
    • 无刷直流电动机的定子绕组每360°接收两个电流脉冲。 的转子旋转,每个电流脉冲经由相应的电流路径提供。 每个电流路径包含至少一个具有导电和非导通状态的功率晶体管开关。 这些状态由相应的驱动晶体管开关决定; 当驱动晶体管开关处于高输出阻抗状态时,各个功率晶体管开关导通,但是当处于低输出阻抗状态时,使得功率晶体管开关不导通。 以本文公开的各种方式,采取措施来防止两个电流路径的功率晶体管开关同时导通。 这可以使用如此连接的固有或离散的基极 - 发射极电容来使功率晶体管开关突然断开,但是仅在经过预定延迟之后接通。 或者,电动机的转子位置感测霍尔单元产生的霍尔电压可以被施加到比较器,使得功率晶体管开关甚至不命令进行,除了在每个短于180度的各个周期内。
    • 9. 发明授权
    • Brushless three-phase dc motor
    • US5834873A
    • 1998-11-10
    • US448006
    • 1995-05-23
    • Rolf Muller
    • Rolf Muller
    • H02K1/02H02K1/14H02K21/14H02K29/03H02K29/08H02K1/10
    • H02K21/14H02K1/146H02K1/148H02K29/03H02K29/08H02K1/02
    • A three-phase brushless dc motor includes a permanent-magnet rotor magnet arrangement having at least four poles and a Y-connected, or star-connected, three-phase stator winding. The winding's phases are arranged non-overlapping in slots of a slotted stator, the currents flowing in the three phases being controlled via at least three semiconductor elements by at least three magnetic-field-sensitive rotor position sensors. Each sensor is associated with a respective two of the winding's three phases and triggers a commutation which switches off the current in one of the associated two phases and switches on the current in the other of the associated two phases. The sensors are located to sense the permanent-magnet flux emanating from the rotor poles themselves. The rotor position sensors are provided at special angular locations on the stator. Each sensor is provided at an angular location at which there is not to be found, neither prior to nor subsequent to the commutation associated with that sensor, any energized stator pole; this may mean that the sensor location is (i) an angular location at which no energizable stator pole whatever is present, and it may mean that the sensor location is (ii) an angular location at which an energizable stator pole is in fact present, but during motor operation this energizable stator pole is in an unenergized state prior to a commutation associated with the particular sensor in question and likewise is in unenergized state subsequent to that commutation.