To provide a controller of an electric power steering system making it possible to prevent the resolution of a motor current from excessively degrading and to inexpensively upgrade the heat radiation efficiency of a shunt resistor.SOLUTION: An EPS-ECU 60 that performs steering control of a vehicle 1 includes a substrate 100, a shunt resistor R1 and MOSFETs 120a to 120d mounted on the substrate 100, and a substrate fixation/heat radiation structure 130 disposed on an undersurface 100B of the substrate 100. The substrate fixation/heat radiation structure 130 includes substrate fixation parts 132a to 132d, MOSFET heat radiation parts 133, and a shunt resistor heat radiation part 134. A via hole 101 is formed between the shunt resistor R1 and MOSFET 120a on the substrate 100. The via hole 101 is filled with a grease 140. The grease 140 poured into the via hole 101 is in contact with the shunt resistor heat radiation part 134 and MOSFET heat radiation part 133.SELECTED DRAWING: Figure 3
【課題】モータ電流の分解能の過度な低下を防止するとともに、シャント抵抗の放熱効率を安価に向上できる電動パワーステアリングの制御装置を提供する。【解決手段】車両1の操舵制御を行うEPS-ECU60は、基板100と、基板100に実装されたシャント抵抗R1およびMOS-FET120a~120dと、基板100の下面100B側に配置される基板固定・放熱構造体130とを備え、基板固定・放熱構造体130は、基板固定部132a~132dと、MOS-FET用放熱部133と、シャント抵抗用放熱部134とを備える。基板100のシャント抵抗R1とMOS-FET120aとの間には貫通ビア101が形成され、貫通ビア101の内部にグリス140が充填される。貫通ビア101に充填されたグリス140は、シャント抵抗用放熱部134およびMOS-FET用放熱部133に接している。【選択図】図3
CONTROLLER OF ELECTRIC POWER STEERING SYSTEM
電動パワーステアリングの制御装置
2025-03-24
Patent
Electronic Resource
Japanese
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