Machine room less elevators (usually shortened to as M.R.L. or MRL) are a type of either traction or hydraulic elevator which do not require a machine room for the elevator. Machine room less elevators do not have a fixed machine room on the top of the hoistway, instead the traction hoisting machine is installed either on the top side wall of the hoistway or on the bottom of the hoistway. The motor is installed using a permanent magnet which "sticks" the motor permanently and work with Variable Voltage Variable Frequency (VVVF) drive.