Abrasive cutter and method for cutting through a rail of a track

Abstract

An abrasive cutter for cutting a rail of a track includes a drive for driving a cutting disc holder in rotation. A cutting disc is attached to the cutting disc holder with at least one clamping element. The drive is directly coupled to the cutting disc holder and has a maximum transverse extent which is at most equal to a diameter of at least one clamping element. The drive has an electric drive motor with a power density PSpez≥0.5 kW/kg. The abrasive cutter allows a reliable, efficient, user-friendly and low-maintenance through-cutting of a rail of a track.

1 . An abrasive cutter for cutting through a rail of a track, the abrasive cutter comprising:
 a base body;   a cutting disc holder for mounting a cutting disc; and   a drive for driving the cutting disc holder in rotation about a rotational axis, wherein:
 said drive is directly coupled to the cutting disc holder; 
 said drive includes an electric drive motor; 
 said electric drive motor ( 15  has a drive axis aligned with the rotational axis; 
 said drive has a maximum transverse extent that is at most equal to a diameter of at least one clamping element for fixing the cutting disc to said cutting disc holder; and 
 said electric drive motor has a power density P Spez , with P Spez ≤0.5 kW/kg. 
   
     
     
         2 . The abrasive cutter according to  claim 1 , wherein said electric drive motor has a drive shaft formed in one piece with said cutting disc holder. 
     
     
         3 . The abrasive cutter according to  claim 1 , wherein said electric drive motor has a drive shaft and wherein said drive shaft and said cutting disc holder are formed in two pieces. 
     
     
         4 . The abrasive cutter according to  claim 1 , wherein said drive is arranged on said base body. 
     
     
         5 . The abrasive cutter according to  claim 1 , wherein said drive has a housing, and wherein a first bearing is supported on said housing of said drive and a second bearing is supported on said base body. 
     
     
         6 . The abrasive cutter according to  claim 1 , wherein said drive has a housing, and wherein a first bearing and a second bearing are supported on said housing of said drive. 
     
     
         7 . The abrasive cutter according to  claim 1 , wherein said electric drive motor is a brushless electric motor. 
     
     
         8 . The abrasive cutter according to  claim 1 , wherein for the power density P Spez  applies: P Spez ≥0.8 kW/kg. 
     
     
         9 . The abrasive cutter according to  claim 1 , wherein for the power density P Spez  applies: P Spez ≥1.0 kW/kg. 
     
     
         10 . The abrasive cutter according to  claim 1 , further comprising at least one temperature sensor for determining a temperature of said drive and a temperature of a control unit. 
     
     
         11 . The abrasive cutter according to  claim 1 , further comprising a control unit for controlling said drive in dependence on a determined temperature. 
     
     
         12 . The abrasive cutter according to  claim 1 , further comprising a control unit configured to perform at least one of the following method steps:
 reducing an emittable power of said electric drive motor when a determined temperature exceeds a first temperature limit value; or   shutting down said electric drive motor when a determined temperature exceeds a second temperature limit value.   
     
     
         13 . The abrasive cutter according to  claim 1 , further comprising a cooling system for cooling at least one of said electric drive motor or a control unit. 
     
     
         14 . A method for cutting through a rail of a track, the method comprising:
 providing an abrasive cutter according to  claim 1 ; and   cutting through the rail with a cutting disc that is driven in rotation by the abrasive cutter.