Drive system for patient lift

A method for a drive system for a patient lift to control a vertical movement of a patient support mounting device, wherein the drive system includes a drum configured to control the vertical movement of the patient support mounting device of the patient lift via a load bearing member, at least two motors adapted to drive the drum, each motor of the at least two motors being connected to a motor shaft gear via an output motor shaft, and a transmission connecting each motor and the drum, the transmission being adapted to transfer torque from each motor to the drum, wherein the transmission comprises a transmission interface adapted to interplay with the motor shaft gear, wherein the transmission interface is configured to receive the motor shaft gear in at least two configurations, each configuration being associated with an orientation of the output motor shaft relative the transmission interface, wherein the transmission interface comprises an input transmission gear adapted to interplay with the motor shaft gear, wherein the transmission comprises an output gear fixed to the drum, the output gear being connected to the transmission interface for receiving torque from the motor shaft gear, and wherein the motor shaft gear and the input transmission gear form a worm drive, the method comprising:

• obtaining a torque exerted by each motor of the at least two motors;
• determining at least one torque differential value as a difference between the torque exerted by each motor of the at least two motors;
• and
• adjusting the torque exerted by at least one motor of the at least two motors to compensate for the determined at least one torque differential value.