Method for starting an electric motor in a hydraulically operated working machine
OwnerHerbert Ziplies, Sebastian Fillingerinventors
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Abstract
The invention relates to a method for starting at least one asynchronous electric motor of a large hydraulic excavator having a service weight >100 t and having an electrohydraulic drive, in that the particular electric motor is transferred from an idle position to an operating position by using a three-stage motor starting process, wherein the volumetric flow rate of at least one hydraulic pump operatively connected to the electric motor is set to the delivery rate V=0 during all starting stages of the electric motor and the delivery rate V of the hydraulic pump is controlled to a value >0 only after the last starting stage of the electric motor by activating an actuator.
Claims13
A method for starting at least one asynchronous electric motor of a large hydraulic excavator having a service weight >100 t with an electrohydraulic drive, comprising:
- transferring the respective electric motor from an inoperative position into an operative position by using a three-stage motor starting process;
- wherein the volume flow of at least one hydraulic pump which is operatively connected to the electric motor is set to the delivery quantity V=0 during all the starting stages of the electric motor, and the delivery quantity V of the hydraulic pump is not adjusted to a value >0 until after a last starting stage of the electric motor, by activating an actuator element.
A large hydraulic excavator, comprising:
- at least one asynchronous electric motor configured to be started by a three-stage motor starting process during which a volume of flow of at least one hydraulic pump which is operatively connected to the electric motor is set to the delivery quantity V=0 during all starting stages of the electric motor, and the delivery quantity V of the hydraulic pump is not adjusted to a value >0 until after a last starting stage of the electric motor, by activating an actuator element.
Dependencies are inferred from the claim text.