CN110341502A - 具有在不同的电压下操作的多个分离的电气总线的电驱动系统 - Google Patents
具有在不同的电压下操作的多个分离的电气总线的电驱动系统 Download PDFInfo
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- 238000010276 construction Methods 0.000 description 6
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Abstract
一种用于机械式机器的电驱动系统。电驱动系统包括第一电气总线和第二电气总线,第一电气总线和第二电气总线分别配置成在不同的电压下操作。所述第一发电机被配置为在第一电压下向第一电气总线提供电流。所述第二发电机被配置为在第二电压下向第二电气总线提供电流,第二电压不同于第一电压。第一电动机联接到第一电气总线并且被配置为以来自第一电气总线的第一电压下的电力进行操作。第二电动机联接到第二电气总线并且被配置为以来自第二电气总线的第二电压下的电力进行操作。用来驱动机械式机器的机械动力由第一电动机和第二电动机两者产生。
Description
技术领域
本发明涉及电驱动系统,其利用发电机向电动机提供电力。特别是,本发明涉及用于机器(例如车辆和轮式装载机)的电驱动系统。
发明内容
在一个实施例中,本发明提供一种用于机械式机器的电驱动系统。该电驱动系统包括第一电气总线和第二电气总线。所述第一发电机被配置为在第一电压下向第一电气总线提供电流。所述第二发电机被配置为在第二电压下向第二电气总线提供电流,第二电压不同于第一电压。第一电动机联接到第一电气总线并且被配置为以来自第一电气总线的第一电压下的电力进行操作。第二电动机联接到第二电气总线并且被配置为以来自第二电气总线的第二电压下的电力进行操作。用来驱动机械式机器的机械动力由第一电动机和第二电动机两者产生。
在一些实施例中,电驱动系统还包括传动装置,该传动装置可操作地联接到第一电动机和第二电动机两者,并且通过组合由第一电动机和第二电动机两者产生的机械动力而产生被输出到机械式机器的机械动力输出。在一些实施例中,机械式机器包括驱动系统,该驱动系统提供用于车辆的运动的原动力。在一些实施方式中,第一电气总线是AC电气总线,第二电气总线是DC电气总线。
通过考虑详细描述和附图,本发明的其他方面将变得显而易见。
附图说明
图1是根据一个实施例的用于轮式装载机的串联电动力传动系统(electricdrivetrain)的示意性框图。
图2是根据另一实施例的用于车辆(例如,轮式装载机)的电动力传动系统的示意性框图,该车辆具有两个发电机,每个发电机在不同的电压下向一个不同的电气总线提供动力。
图3是图2的电动力传动系统的示意性框图,该电动力传动系统被配置为仅在两个电气总线的一个上包括逆变器。
图4是图2的电动力传动系统的示意性框图,该电动力传动系统被配置为用于如下的车辆,该车辆具有附加的电驱动式装置或系统或机械驱动式装置或系统。
图5是图2的电动力传动系统的示意性框图,该电动力传动系统构造成包括再生制动系统。
具体实施方式
在详细解释本发明的任何实施例之前,应理解,本发明的应用不限于以下描述中阐述的或在以下附图中示出的部件的构造细节和布置细节。本发明能够具有其他实施例并且能够以各种方式实践或实施。
图1示出了用于建筑车辆(诸如例如轮式装载机)的串联电动力传动系统100的示例。在该示例中,发动机97(例如,由汽油、柴油、丙烷等提供动力的内燃机)通过齿轮箱99联接到发电机101。发电机101产生DC(直流)电力并将该DC电力提供给逆变器103。逆变器103将来自发电机的DC电力转换为具有特定电压的AC(交流)电力,并将AC电力输出到电气总线“A”以供使用。电动机105还联接到电气总线“A”并从电气总线“A”汲取电力以为电动机105的操作供电。由电动机105产生的机械动力被施加到传动装置107,该传动装置107机械地联接到电动机105。然后,使用来自传动装置107的机械动力来操作建筑车辆的其它机械系统,包括例如经由驱动系统109提供原动力以驱动车辆的车轮或履带。在该示例中,齿轮箱99还可操作地联接到液压缸系统111,液压缸系统111构造成可控制地提升和倾斜轮式装载机的铲斗。因此,在该示例中,来自发动机97的机械动力用于操作铲斗缸111。
在一些其他实施方式中,发电机101被设置为没有转接器的电动机器,该发电机101产生交流输出。在这样的实施方式中的逆变器103被配置为整流器以对发电机的AC输出进行整流。在各种实施方式中,发电机101的AC输出可以被无源整流器或有源整流器整流。有源整流器通常被称为“逆变器”。因此,在图1所示的示例中和在下面的其他示例中,术语“逆变器”用于表示(a)逆变器,其将来自发电机的直流输出转换为交流输出,或(b)有源整流器,其对发电机的交流输出进行整流。此外,就本文所描述的示例而言,该示例特别地参考将DC输出提供到逆变器的发电机,应当理解本文描述的具体配置和示意性实例可以是扩展到如下的替代实施方式,该替代实施方式包含产生AC输出的发电机,该AC输出被提供给有源整流器(例如,“逆变器”)以进行整流。
逆变器和电动机器-诸如例如发电机和电动机-由功率等级和电压来进行标定。特别是对于逆变器,逆变器的不同“额定功率”等级之间的成本差异可能很明显。例如,额定功率为第一功率等级的逆变器的成本几乎是额定功率为较低功率等级的另一个逆变器的两倍。此外,多个可用的逆变器的多个额定功率通常被分级,使得具有较高额定功率的下一个可用的逆变器的额定功率可以为前一个电功率大小的两倍。因此,当系统需要中间功率等级(即,两个可用逆变器的额定功率之间的功率等级)时,该系统通常被制造为包括如下的逆变器,该逆变器的额定功率为明显高于必要的功率等级的较高功率等级。例如,如果图1的系统需要30kW的电功率来操作驱动系统109并且可用的逆变器的额定功率为25kW和50kW,则制造商可以实施该系统以利用具有下一个最高额定功率(例如,50kW)的逆变器,从而以确保在30kW负载下正常运行。反过来,系统也可能需要设计成利用额定功率也都为50kW的电功率的发电机101和/或电动机105。
图2示出了用于建筑车辆(诸如例如轮式装载机)的动力传动系统200的替代示例,该建筑车辆被配置为包括并联操作的两个不同的串联电动力传动系统。第一发电机201再次产生DC电力并将该DC电力提供给逆变器203,逆变器203将DC电力转换为具有特定电压的AC电力,并将AC电力输出到第一电气总线“A”以供使用。第二发电机213也产生DC电力并将该DC电力提供给第二逆变器215,第二逆变器215类似地将DC电力转换为具有特定电压的AC电力,并将AC电力输出到第二电气总线“B”以供使用。第一电动机205联接到第一电气总线“A”并被配置为以从第一电气总线“A”汲取的电力操作。第二电动机217联接到第二电气总线“B”并被配置为以从第二电气总线“B”汲取的电力操作。
在图2的系统中,可以选择逆变器203、215和发电机201、213以具有不同的额定电功率并且产生不同的电压下的电力。例如,第一发电机201和第一逆变器203两者的额定功率都可以为第一电功率等级(例如,X kW)并且被配置为在第一电气总线“A”上输出第一电压(例如,Y伏DC)下的电力,而第二发电机213和第二逆变器215两者的额定功率都可以为第二较低的电功率等级(例如,X/5kW)并且被配置为在第二电气总线“B”上输出第二电压(例如,Y/2伏)下的电力。因此,第一电动机205和第二电动机217也可以被选择为具有不同额定功率和/或额定电压,以对应于相应的逆变器203、215。
在图2的示例中,第一电动机205和第二电动机217都联接到相同的传动装置207并且被配置为两者都向传动装置207提供输出的机械动力。第一电动机205和第二电动机217的组合机械动力然后被用来操作建筑车辆的其他机械系统,包括例如经由驱动系统209提供原动力以驱动车辆的车轮或履带。返回到上面的示例,如果需要30kW的电功率来操作驱动系统209,那么图2的系统可以配置成利用额定功率为25kW的第一逆变器203和额定功率为5kW的第二逆变器215,而不是使用单个串联的电动力传动系统,在该串联的电动力传动系统中,个逆变器的额定功率为下一个最高电功率等级(例如,50kW)。
尽管图2的示例仅包括两个发电机/逆变器/电动机的组合,但在其他实施方式中,系统可被配置为包括附加的发电机/逆变器组合以在其他电气总线上提供(例如,在不同的电压等级下)的电力。类似地,一些这样的实施方式还可以包括联接到附加电气总线的附加电动机。
此外,尽管图2的示例示出了电动机205和电动机217两者向相同的传动装置提供机械动力,但是在其他实施方式中,系统可以被配置为使用不同电动机的输出来操作不同的机械系统。例如,系统可以被配置为使用第一电动机205的输出来操作驱动系统209并使用第二电动机217的输出来操作铲斗提升/倾斜缸。类似地,在其他实施方式中,系统可以被配置为使用第一电动机205的输出来向车辆的后轮提供原动力并且使用第二电动机217的输出来为车辆的前轮提供原动力。因此,其他实施方式可以被配置为包括两个或更多个传动装置系统,而不是如图2的示例中所示的单个传动装置207。
图2中所示的系统200仅是如下实施方式的一个示例,该实施方式被被配置为利用在不同电压下的多个电气总线。其他实施方式可以包括附加的、更少的或不同的部件,并且可以在不同的机器中实现和/或向不同的输出装置提供机械动力。例如,图3示出了动力传动系统300的示例,其包括两个不同的电气总线,但不包括第二逆变器。与图2的系统类似,图3的动力传动系统300包括第一发电机301,第一发电机301产生DC电力并将该DC电力提供给逆变器303,逆变器303将DC电力转换为具有特定电压的AC电力,并将AC电力输出到第一电气总线“A”以供使用。第一电动机305联接到第一电气总线“A”并从第一电气总线“A”汲取其操作动力
系统300还包括第二发电机313。然而,在图3的示例中,第二发电机313直接向第二电气总线“B”提供输出的电力,而不首先使用逆变器来转换从第二发电机313输出的电力。在一些实施例中,第二发电机313包括具有集成的电子器件的电动机器。第二电动机317还联接到第二电气总线“B”并从第二电气总线“B”汲取其操作动力。在一些实施方式中,发电机313可以配置为产生AC电力,而不是DC电力,并且因此,为了向第二电气总线“B”提供AC电力,可能不需要逆变器。然而,在其他实施方式中,系统可以被配置为包括AC电气总线(即,第一电气总线“A”)和DC电气总线(即,第二电气总线“B”)。在这样的实施方式中,第二发电机313被配置为生成DC电力并且将DC电力直接输出到第二电气总线“B”以供使用。在一些这样的实施方式中,联接到DC电气总线(即,第二电气总线“B”)的第二电动机317可以被配置为以DC电力进行操作。替代地,可以将逆变器结合到第二电动机317中,或者可以在第二电气总线“B”的输出侧配置附加的逆变器以将从第二电气总线“B”汲取的DC动力转换成AC动力,该AC动力然后用于操作电动机317。在图3的示例中,第一电动机305和第二电动机317两者再次都被机械地联接到传动装置307以向传动装置307提供机械动力,该传动装置307继而被用于操作驱动系统309。
在图2和图3的示例中,发电机201、213或301、313可以通过一个或多个齿轮箱联接到相同的发动机(例如,由汽油,柴油或丙烷作为燃料的内燃机)。替代地,在一些实施方式中,建筑车辆(例如,轮式装载机)可以被配置为包括两个分开的发动机,每个发动机联接到两个发电机中的一个不同的发电机。此外,如上面参照图1所讨论的,在一些实施方式中,用于可控地提升和倾斜轮式装载机的铲斗的液压缸系统通过齿轮箱可操作地联接到为发电机提供动力的相同发动机。类似地,在图2和图3的示例的一些实施方式中,单个发动机可以通过一个或多个齿轮箱可操作地联接到第一发电机201/301、第二发电机213/313、以及附加的机械装置或系统,诸如例如,用于可控制地提升和倾斜轮式装载机的铲斗的液压缸系统。
另外,在一些实施方式中,系统还可以被配置为通过电动力传动系统向其他装置或系统提供机械操作动力或电气操作动力。图4示出了一个这样的示例,其中系统被配置为除了向车辆的驱动系统提供操作动力之外还向其他系统和/或装置提供操作动力。系统400包括第一发电机401,第一发电机401产生DC电力并将该DC电力提供给第一逆变器403,第一逆变器403将DC电力转换为具有特定电压的AC电力,并将AC电力输出到第一电气总线“A”以供使用。第一电动机405联接到第一电气总线“A”并从第一电气总线“A”汲取其操作动力。类似地,第二发电机413产生DC电力并将该DC电力提供给第二逆变器415,第二逆变器415将DC电力转换为具有第二特定电压的AC电力,并将AC电力输出到第二电气总线“B”以供使用。第二电动机417联接到第二电气总线“B”并从第二电气总线“B”汲取其操作动力。第一电动机405和第二电动机417两者都被机械地联接到传动装置407以向传动装置407提供机械动力,然后传动装置407使用来自第一电动机405和第二电动机417的组合机械输出动力来操作车辆的驱动系统409。
在图4的示例中,一个或多个附加的装置或系统也可以可操作地联接以从动力传动系统接收操作动力。在一些实施方式中,附加的装置/系统411可包括机械驱动式装置或系统,其可操作地联接到传动装置407的输出,从而第一电动机405和第二电动机417的组合机械输出动力被用来操作上述驱动系统409和附加的机械驱动式装置/系统411两者。例如,在一些实施方式中,用于可控制地提升和倾斜轮式装载机的铲斗的液压缸系统被实施为附加机械驱动式装置/系统411,并且被构造为从传动装置407汲取机械操作动力。
在一些实施方式中,附加的装置/系统411可包括电驱动式装置或系统,其电联接到电气总线“A”并且配置成从与第一电动机405相同的电气总线汲取电力。例如,在一些实施方式中,用于可控制地提升和倾斜轮式装载机的铲斗的液压缸系统可以实施为具有电驱动式液压泵和/或阀的系统,该电驱动式液压泵和/或阀被配置为从电气总线“A”汲取电气操作动力。类似地,在一些实施方式中,附加的装置/系统411可包括一个或多个电气车辆灯,这些车辆灯联接到电气总线“A”并且配置成从电气总线“A”汲取其操作动力。在其他实施方式中,传动装置407可以被实施为例如分路径传动装置,其被配置为利用电力来可控地操作变速器,并且继而调整传动装置的机械输出动力的速度。在这样的实施方式中,图4的系统可以被配置为使得附加电驱动式装置/系统411包括分路径传动装置的电控式变速器,该电控式变速器被配置为以从电气总线汲取“A”的电力进行操作。
在上面的示例中,提供给每个单独的或离散的电气总线的电力源自单个发电机。如上所述,在一些实施方式中,发电机由例如汽油,柴油或丙烷作为燃料的内燃机提供动力或包括该内燃机。然而,在其他实施方式中,发电机可以实现为另一种类型的发电机,包括例如太阳能发电机或风力发电机。在其他实施方式中,位于个别电气总线上的电力可以接收自多个不同的发电机源。图5示出了如下的一个示例,其中从发电机(例如汽油动力发电机)和再生制动式发电机两者接收位于两个电气总线之一上的电力。
图5的系统500包括第一发电机501,第一发电机501产生DC电力并将该DC电力提供给第一逆变器503,第一逆变器503将DC电力转换为具有第一特定电压的AC电力,并将AC电力输出到第一电气总线“A”以供使用。第一电动机505联接到第一电气总线“A”并从第一电气总线“A”汲取其操作动力。第二发电机513产生DC电力并将该DC电力提供给第二逆变器515,第二逆变器515将DC电力转换为具有第二特定电压的AC电力,并将AC电力输出到第二电气总线“B”以供使用。第二电动机517联接到第二电气总线“B”并从第二电气总线“B”汲取其操作动力。第一电动机505和第二电动机517两者被机械地联接到传动装置507以向传动装置507提供机械动力,然后传动装置507使用来自第一电动机505和第二电动机517的组合机械输出动力以操作车辆的驱动系统509和(例如,轮式装载机的)一个或多个铲斗提升/倾斜缸。
系统500还被配置为包括再生制动式发电机519,其被配置为通过将车辆的动能(例如,在车轮,车轴等上)转换成电能来减慢车辆的运动。再生制动式发电机519被配置为将所产生的电力提供给电池514以对电池514充电。然后将电池514上存储的电力直接提供给第二电气总线“B”,或者在某些情况下在将来自电池的电力提供给第二电气总线“B”以供使用之前提供给逆变器515(或另一个附加的逆变器),以转换/调节电池的输出(例如,转换为AC)。
尽管在图5的示例中,来自再生制动式发电机519的电力仅被提供给第二电气总线“B”,但在其他实施方式中,该系统可被配置为将由再生制动产生的电力提供给两个电气总线。例如,电池514可以联接到两个分开的逆变器-其中一个逆变器配置成将来自电池514的输出的电力调节/转换成适合于第一电气总线“A”的电力,而另一逆变器被配置成将来自电池514的输出调节/转换成适合于第二电气总线“B”的形式。然后,每个逆变器将被联接以将其所调节的电气输出提供给第一电气总线“A”和第二电气总线“B”中相应的一个。在其他实施方式中,系统500可以配置为包括用于第一电气总线“A”和第二电气总线“B”的分开的电池,并且还可以配置为包括分开的再生制动式发电机,以向每个不同的电池提供动力。
此外,在一些实施方式中,图1、2、3、4和5中示出的电驱动系统可以进一步配置为包括一个或多个电池以存储来自发电机的电能并且将存储的能量提供给电气总线(例如,经由逆变器),从而在电气总线上保持恒定的电压、电流和/或功率等级。
因此,本发明尤其提供了一种电驱动系统,其被配置为利用在不同电压下操作的至少两个分开的电气总线。在以下权利要求中阐述了本发明的各种特征和优点。
Claims (14)
1.一种用于机械式机器的电驱动系统,该电驱动系统包括:
第一电气总线;
第一发电机,所述第一发电机被配置为在第一电压下向第一电气总线提供电流;
第二电气总线;
第二发电机,所述第二发电机被配置为在第二电压下向第二电气总线提供电流,第二电压不同于第一电压;
第一电动机,所述第一电动机联接到第一电气总线并且被配置为以来自第一电气总线的第一电压下的电力进行操作,其中第一电动机产生用于机械式机器的机械动力;和
第二电动机,所述第二电动机联接到第二电气总线并且被配置为以来自第二电气总线的第二电压下的电力进行操作,其中第二电动机产生用于机械式机器的机械动力。
2.根据权利要求1所述的电驱动系统,还包括可操作地联接在第一发电机和第一电气总线之间的第一逆变器,
其中,第一发电机被配置为通过向第一逆变器提供电气输出以在第一电压下向第一电气总线提供电流,所述电气输出由第一逆变器转换为第一电压下的交流输出,所述交流输出由第一逆变器提供给第一电气总线。
3.根据权利要求2所述的电驱动系统,还包括可操作地联接在第二发电机和第二电气总线之间的第二逆变器,
其中,第二发电机被配置为通过向第二逆变器提供电气输出以在第二电压下向第二电气总线提供电流,所述电气输出由第二逆变器转换为第二电压下的交流输出,所述交流输出由第二逆变器提供给第二电气总线。
4.根据权利要求3所述的电驱动系统,其中,所述第一逆变器的额定功率为第一电功率等级,所述第二逆变器的额定功率为第二电功率等级,其中所述第二电功率等级小于所述第一电功率等级。
5.根据权利要求4所述的电驱动系统,其中,第一电动机和第一发电机均被配置为在与第一逆变器的第一额定电功率等级对应的功率等级下操作,并且其中,第二电动机和第二发电机均被配置为在与第二逆变器的第二额定电功率等级对应的功率等级下操作。
6.根据权利要求2所述的电驱动系统,其中,所述第一电气总线为交流电气总线,其中所述第二电气总线为直流电气总线,并且其中所述第二发电机为直流发电机并且被配置为通过向第二电气总线提供直流输出以在第二电压下向第二电气总线提供电流。
7.根据权利要求1所述的电驱动系统,还包括传动装置,所述传动装置可操作地联接到第一电动机和第二电动机,并且其中所述传动装置被配置成组合来自所述第一电动机和所述第二电动机的机械动力以提供机械动力输出,从而操作机械式机器。
8.根据权利要求7所述的电驱动系统,其中所述机械式机器包括用于车辆的驱动系统,并且其中来自所述传动装置的机械动力输出向所述驱动系统提供用于所述车辆的移动的原动力。
9.根据权利要求8所述的电驱动系统,其中所述机械式机器还包括第二机械驱动式装置,并且其中来自所述传动装置的机械动力输出操作所述第二机械驱动式装置。
10.根据权利要求1所述的电驱动系统,还包括电驱动式装置,其中所述电驱动式装置联接到所述第一电气总线并且被配置为从所述第一电气总线汲取在所述第一电压下的操作电力。
11.根据权利要求1所述的电驱动系统,其中所述第一电气总线联接到附加的电力源,所述附加的电力源被配置为向所述第一电气总线提供电流。
12.根据权利要求11所述的电驱动系统,其中所述机械式机器包括驱动系统,所述驱动系统被配置为提供用于车辆的运动的原动力,其中所述附加的电力源包括再生制动式发电机,所述再生制动式发电机可操作地联接到所述驱动系统并且被配置为在减慢车辆的运动的同时产生电输出,并且其中再生制动式发电机被配置为将来自所述电输出的电流提供给第一电气总线。
13.根据权利要求12所述的电驱动系统,还包括电池,所述电池被配置为存储电能,所述电能来自选自包含再生制动式发电机和所述第一发电机的组中的至少一个,并且其中所述电池被配置为将所储存的电能提供给第一电气总线。
14.根据权利要求1所述的电驱动系统,其中第一发电机和第一电动机被配置为在第一电功率等级下操作,其中第二发电机和第二电动机被配置为在第二电功率等级下操作,其中第二电功率等级小于第一电功率等级,并且其中第二电压小于第一电压。
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