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    • 4. 发明申请
    • COMMUTATION CURRENT GENERATOR FOR MAGNETIC MOTORS
    • 电动机的电流发电机
    • WO2009047741A2
    • 2009-04-16
    • PCT/IB2008/054196
    • 2008-10-13
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.ANGELIS, Georgo, Z.GOOSSENS, Hendrikus, M., W.
    • ANGELIS, Georgo, Z.GOOSSENS, Hendrikus, M., W.
    • H02P25/06
    • H02P25/06
    • A commutation current generator (30, 60) for controlling independent orthogonal forces of a magnetic motor (40, 70) including a magnetic track (41, 71) and a forcer (42, 72). The commutation current generator (30, 60) receives a demanded drive force signal (DFX) representative of a demanded drive force required to move the forcer (42, 72) to a desired X drive axis position relative to the magnetic track, a demanded orthogonal force signal (DFZ, DFY) representative of a demanded orthogonal force required to move the forcer (42, 72) to a desired orthogonal axis position relative to the magnetic track, and a sensed drive position signal x(t) representative of a sensed X drive axis position of the forcer (42, 72) relative to the magnetic track. In response thereto, the commutation current generator (30, 60) applies a superimposition of commutation orthogonal currents (I Z1 -I z3 , I Y1 -I Y3 ) on commutation drive currents (I XI -I X3 ) to the forcer (42, 72) for controlling the independent orthogonal forces.
    • 一种用于控制包括磁道(41,71)和一个驱动器(42,72)的磁性马达(40,70)的独立正交力的换向电流发生器(30,60)。 换向电流发生器(30,60)接收代表所需驱动力的要求驱动力信号(DFX),所述驱动力信号(DFX)将所述驱动力(42,72)移动到相对于磁道的期望的X驱动轴位置所需的驱动力, 代表将锻炼器(42,72)移动到相对于磁道的期望的正交轴位置所需要的正交力的力信号(DFZ,DFY)以及感测的驱动位置信号x(t) 驱动轴(42,72)相对于磁道的驱动轴位置。 响应于此,换向电流发生器(30,60)将换向正交电流(IZ1-Iz3,IY1-IY3)与换向驱动电流(IXI-IX3)的叠加施加到用于控制独立 正交力
    • 7. 发明申请
    • A MAGNETIC RESONANCE IMAGING SYSTEM
    • 磁共振成像系统
    • WO2008007299A2
    • 2008-01-17
    • PCT/IB2007/052583
    • 2007-07-03
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.KOEVOETS, Adrianus, H.ANGELIS, Georgo, Z.ROOZEN, Nicolaas, B.PEEREN, Gerardus, N.HAM, Cornelis, L., G.
    • KOEVOETS, Adrianus, H.ANGELIS, Georgo, Z.ROOZEN, Nicolaas, B.PEEREN, Gerardus, N.HAM, Cornelis, L., G.
    • G01R33/3854G01R33/4215
    • The invention relates to a magnetic resonance imaging system which comprises means for generating a static magnetic field and a gradient coils system for generating a time varying magnetic gradient field by use of a first electrical current and a second electrical current. The gradient coils system is located in the magnetic field and the gradient coils system has a plurality of vibrational modes. Lorentz forces are generated due to the interaction of the first and/or second electrical currents with the superposition of the static magnetic field and the magnetic gradient field. The gradient coils system and/or the first electrical current are adapted so that the integral of the in-products of said Lorentz forces and a vibrational mode of said plurality of vibrational modes is at a value close to zero, wherein said in-products are determined for all points of the gradient coils system, and wherein the integral is determined by summing the in-products determined for all the points. As the above mentioned integral is close to zero or preferably zero, the Lorentz forces are not able to excite the vibrational mode (for example the lowest order bending mode) of the gradient coils system. Thus acoustical noise that is generated by a vibrating gradient coils system is reduced and the comfort for a patient that is examined by the magnetic resonance imaging system is therefore enhanced.
    • 本发明涉及一种磁共振成像系统,其包括用于产生静态磁场的装置和用于通过使用第一电流和第二电流产生时变磁梯度场的梯度线圈系统。 梯度线圈系统位于磁场中,梯度线圈系统具有多个振动模式。 由于第一和/或第二电流与静磁场和磁梯度场的叠加相互作用,产生洛伦兹力。 梯度线圈系统和/或第一电流被调整为使得所述洛伦兹力的所述产物和所述多个振动模式的振动模式的积分值接近于零,其中所述产品是 对于梯度线圈系统的所有点确定,并且其中通过对所有点确定的产品求和来确定积分。 由于上述积分值接近零或优选为零,所以洛伦兹力不能激发梯度线圈系统的振动模式(例如最低阶弯曲模式)。 因此,由振动梯度线圈系统产生的声学噪声减小,并且因此增强了由磁共振成像系统检查的患者的舒适度。