Self-propelled working machine with electrical drive system and processes for operating the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-007/00
E01C-023/088
E01H-005/09
E02F-003/20
E02F-009/20
E21C-041/26
출원번호
US-0084962
(2011-04-12)
등록번호
US-8947026
(2015-02-03)
우선권정보
DE-10 2010 014 644 (2010-04-12)
발명자
/ 주소
Graner, Klaus
Fenker, Oliver
Lis, Johann
출원인 / 주소
Liebherr-Components Biberach GmbH
대리인 / 주소
Dilworth & Barrese, LLP.
인용정보
피인용 횟수 :
2인용 특허 :
9
초록▼
The present invention relates to a self-propelled working machine, especially in the form of a surface milling machine, such as asphalt-milling machine or snow-milling machine comprising a main operating unit and/or a drive unit, which is operable in a steady-state or near steady-state operating sta
The present invention relates to a self-propelled working machine, especially in the form of a surface milling machine, such as asphalt-milling machine or snow-milling machine comprising a main operating unit and/or a drive unit, which is operable in a steady-state or near steady-state operating status and is drivable by a drive device comprising at least an electrical motor, the electrical motor being associated with a start-up including a frequency converter for the limitation of starting current. The invention also relates to a process for operating such a self-propelled working machine. According to the invention an operating circuit for steady-state operation is provided, comprising a jumper for bridging the frequency converter following starting or reaching steady-state operational status. Optionally, the jumper is switchable to activate or inactivate the frequency converter of the start-up circuit, respectively.
대표청구항▼
1. A self-propelled working machine, comprising: a main operating unit and/or a drive unit (2), operable in a steady-state operating status and drivable by a drive device (13) comprisingat least an electrical motor (M), the electrical motor being associated to a start-up circuit (18) including at le
1. A self-propelled working machine, comprising: a main operating unit and/or a drive unit (2), operable in a steady-state operating status and drivable by a drive device (13) comprisingat least an electrical motor (M), the electrical motor being associated to a start-up circuit (18) including at least a frequency converter (FU) for the limitation of starting current, andan operating circuit (19) for the steady-state operating status comprising a jumper (9) for bridging the frequency converter (FU) following starting or reaching steady-state operational status,wherein the at least one frequency converter (FU) is associated with a braking resistor (15) and a braking circuit (20) and separation devices (11, 14, 9) for the separation of all direct connections between the at least one electrical motor (M) and an electrical power supply, as well as preferably synchronization means for the synchronization of frequency converter (FU) or of frequency converters (FUs) onto the respective electrical motor (M) before start of braking action are provided. 2. The self-propelled working machine according to claim 1, wherein the operating circuit (19) has a control device for activating/deactivating of jumper (9) according to the working speed of said main operating unit and/or a drive unit (2) and/or said electrical motor (M), jumper (9) preferably being deactivated below a predetermined working speed and is activated above any or above said predetermined working speed. 3. The self-propelled working machine according to claim 1, wherein the operating circuit (19) provides immediate and direct interconnection of frequency and voltage of an electrical power supply to the electrical motor (M) of the drive device (13). 4. The self-propelled working machine according to claim 1, wherein a selectable number of pole pairs of the electrical motor (M) and/or a gear transmission with selectable ratio of transmission/reduction for the setting of the working speed of said main operating unit (2) at a given frequency of the voltage of an electrical power supply is provided. 5. The self-propelled working machine according to claim 1, further including a generator (G) and a combustion engine (7), wherein a selectable number of pole pairs of the generator (G) and/or a selectable number of pole pairs of the electrical motor (M) and/or a gear transmission having selectable ratio of transmission/reduction between the combustion engine (7) and the generator (G) and/or between electrical motor (M) and main operating unit (2) for the setting of the working speed of said main operating unit in a given range of rpm of the combustion engine (7) is provided. 6. The self-propelled working machine according to claim 1, wherein a frequency of the electrical power supply of the electrical system is above 75 Hz. 7. The self-propelled working machine according to claim 1, further including an electrical system and a control device, wherein the electrical system is operable in various load ranges with various frequencies, and the control device advantageously provides higher frequency for full load operation, preferably in a range of 100 to 200 Hz, and provides low frequencies, preferably in the range of 50 Hz to 100 Hz, for part-load operation and/or low-load operation. 8. The self-propelled working machine according to claim 1, wherein the drive device (13) of said main operating unit and/or drive unit (2) comprises multiple electrical motors (M) mechanically coupled to each other through the main operating unit, each of the electrical motors (M) being associated individually or collectively with at least a frequency converter (FU), and the one or multiple jumpers (9) for bridging of all frequency converters (FU) for the steady-state operation is/are provided. 9. The self-propelled working machine according to claim 8, wherein the frequency converter (FU) collectively has a current carrying capacity, which is greater or equal to the nominal current and/or to the total of nominal currents of the at least one electrical motors (M) associated to the at least one FU or to the FUs. 10. The self-propelled working machine according to claim 1, wherein the drive device (13) of said operating unit and/or drive units (2) comprises multiple electrical motors (M), whereof at least one electrical motor (M) is provided without an associated frequency converter and may be decoupled from the electrical power supply during start-up procedure by a separation switch (14), in order to be electroless entrained upwards through mechanical coupling via main operating unit (2). 11. The self-propelled working machine according to claim 10, wherein the frequency converter (FU) in total has a current carrying capacity which is smaller than the motor current of the motor associated to the frequency converter (FU) or frequency converters (FUs) or is smaller than the total of motor currents of the electrical motors associated to the frequency converter (FU) or frequency converters (FUs) at nominal torque. 12. The self-propelled working machine according to claim 1, further including a generator (G) and a combustion engine, wherein the generator (G) is provided as an electrical power supply, the former being drivable, directly or indirectly, by the combustion engine, especially a diesel engine (7). 13. The self-propelled working machine according to claim 1, wherein in addition to the main operating unit (2) at least one electrical ancillary unit (16) is provided and the main operating unit (2) and the at least one ancillary unit (16) are fed by a shared electrical power supply, especially a shared generator (G). 14. The self-propelled working machine according to claim 13, wherein at least two ancillary units (16a; 16b) are fed from differently high voltage levels. 15. The self-propelled working machine according to claim 1, wherein in addition to the main operating unit (2) at least one electrical ancillary unit (16) is provided which is fed by a lower voltage than the main unit (2). 16. The self-propelled working machine according to claim 1, further including at least one ancillary unit and a shared generator (G), wherein the at least one ancillary unit (16) and the main operating unit (2) are fed from differently high voltage levels provided by the shared generator (G) which preferably has separated stator windings. 17. The self-propelled working machine according to claim 1, wherein at least a ancillary unit (16) is even fed during steady-state operation of the main operating unit (2) from another frequency converter (FU) for variation of the working speed of the ancillary unit in relation to the working speed of the main operating unit. 18. The self-propelled working machine according to claim 1, further including at least one ancillary unit and a shared generator (G), wherein the at least one ancillary unit (16) comprises at least a cooling unit, which is operable with various operating frequencies and/or operating voltages and/or which is associated to another frequency converter (FU). 19. A process for operating of a self-propelled working machine, especially in the form of a surface milling machine, such as Surface Miner, asphalt-milling machine or snow-milling machine according to claim 1, wherein at least one electrical motor (M) provided for driving of a main operating units (2) is fed during start-up by another frequency converter (FU) from an electrical power supply and after start-up and/or after reaching of a predetermined steady-state operating status the another frequency converter (FU) will be bridged and the electrical motor (M) will directly be fed from the electrical power supply.
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