公开(公告)号：WO2023081302A1

公开(公告)日：2023-05-11

申请号：PCT/US2022/048859

申请日：2022-11-03

Applicant: TENNANT COMPANY

Inventor： PFINGSTEN, Mark ,  VERHASSELT, Andrew R. ,  LOTTS, Matthew

IPC: A47L11/40

Abstract: A surface maintenance machine includes a maintenance head assembly comprising one or more surface maintenance tools for performing a surface maintenance operation. The machine also includes wheels and an operator grab handle permitting the operator to apply a force to urge the machine to change orientation. The machine also includes a first and second motor controlled by a motor controller. The motor controller is configured to sense a parameter indicative of motor load on the first and second motor and control the power delivered to the first and second motor to maintain a torque output setting. Maintaining the torque output setting is in light of motor load on the first and second motor and the force applied to the machine by the operator. The control of power delivered to the motors to maintain the torque assists the force applied by the operator to the machine.

公开(公告)号：EP4426176A1

公开(公告)日：2024-09-11

申请号：EP22823181.7

申请日：2022-11-03

Applicant: Tennant Company

Inventor： PFINGSTEN, Mark ,  VERHASSELT, Andrew R. ,  LOTTS, Matthew

IPC: A47L11/40

CPC classification number: A47L11/4061 ,  A47L11/4066 ,  A47L2201/0420130101