Extreme inertia! 160kW electric motor hard start

The motor drives a rasper for meshing potatoes in a starch factory. The rotor of the rasper has a diameter of 1200mm, a width of 500mm, weighs 600kg, spins at 4000rpm (faster then the motor) and is driven by 8 parallel belts. The machine meshes 30t of potatoes per hour. Startup (empty machine) takes about 46 seconds, whilst the motor draws around 500A per phase in star mode. The switching point to delta mode is no in the video (but you don't hear any difference anyway).

Motor data:

• 3 phase asynchronous motor
• 160kW nominal power
• 3000 rpm
• 3x 400V @ 233A in delta configuration @ nominal power