# US 2024/0197129 A1 · System and method for controlling a motor at a constant rotations per minute (rpm) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0197129 A1 - Document ID: US20240197129A1 - Status: Published application - Kind: A1 - Application number: 18/587,516 - Filed: 2024-02-26 - Published: 2024-06-20 - Earliest claimed: 2019-10-03 - Assignees: Techtronic Floor Care Technology Limited - Applicants: Techtronic Floor Care Technology Limited - Inventors: Kevin Terry - Web page: https://patentgrep.com/patent/US20240197129A1 ## CPC - A47L 9/2842: {Suction motors or blowers} - A47L 9/2831: {Motor parameters, e.g. motor load or speed} - A47L 9/2884: {Details of arrangements of batteries or their installation} - A47L 9/2894: {Details related to signal transmission in suction cleaners} - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) ## Abstract A cleaning system including a motor configured to provide rotational energy, a current sensor configured to sense current provided to the motor, and a controller having an electronic processor. The controller is configured to receive, from the current sensor, a current signal indicative of the current provided to the motor, filter the current signal to produce a filtered current signal, and control the motor based on the filtered current signal. ## Claims ### Claim at position 1 -20. (canceled) ### Claim 21 A cleaning system comprising: a motor configured to provide rotational energy to a brush; a current sensor configured to sense current provided to the motor; and a controller having an electronic processor, the controller configured to receive, from the current sensor, a current signal indicative of the current provided to the motor, filter the current signal to produce a filtered current signal, and control the motor based on the filtered current signal, wherein the controller controls the motor to operate at a first substantially constant rotations per minute when the current signal is less than a predetermined current threshold, and to operate at a second substantially constant rotations per minute when the current signal is greater than the predetermined current threshold. ### Claim 22 (depends on 21) The cleaning system of claim 21, wherein the controller controls the motor further based on a gain value. ### Claim 23 (depends on 22) The cleaning system of claim 22, wherein the gain value is a predetermined value. ### Claim 24 (depends on 21) The cleaning system of claim 21, wherein the controller controls the motor based on a first gain value when the current signal is less than the predetermined current threshold, and a second gain value when the current signal is greater than the predetermined current threshold. ### Claim 25 (depends on 21) The cleaning system of claim 21, wherein the controller controls the motor further based on the current compared to an unladen current. ### Claim 26 (depends on 25) The cleaning system of claim 25, wherein the unladen current is a predetermined value. ### Claim 27 (depends on 21) The cleaning system of claim 21, wherein the controller controls the motor to operate a substantially constant rotations per minute (RPM). ### Claim 28 (depends on 21) The cleaning system of claim 21, wherein the controller controls the motor via a pulse-width modulated (PWM) signal. ### Claim 29 (depends on 21) The cleaning system of claim 21, further comprising a battery configured to supply power to the motor. ### Claim 30 (depends on 29) The cleaning system of claim 29, wherein the battery is a rechargeable battery pack. ### Claim 31 (depends on 29) The cleaning system of claim 29, wherein the controller controls the motor independent of a voltage of the battery. ### Claim 32 A method of controlling a cleaning system including a motor configured to provide rotational energy to a brush, the method comprising: sensing, via a current sensor, a current provided to the motor; receiving, via a controller, a current signal indicative of the current from the current sensor; filtering, via the controller, the current signal to produce a filtered current signal; controlling, via the controller, the motor based on the filtered current signal; and operating the motor at a first substantially constant rotations per minute when the current signal is less than a predetermined current threshold, and operating the motor at a second substantially constant rotations per minute when the current signal is greater than the predetermined current threshold. ### Claim 33 (depends on 32) The method of claim 32, wherein the motor is further controlled based on a gain value. ### Claim 34 (depends on 33) The method of claim 33, wherein the gain value is a predetermined value. ### Claim 35 (depends on 34) The method of claim 34, further comprising controlling the motor based on a first gain value when the current signal is less than the predetermined current threshold, and a second gain value when the current signal is greater than the predetermined current threshold. ### Claim 36 (depends on 32) The method of claim 32, wherein the motor is further controlled based on the current compared to an unladen current. ### Claim 37 (depends on 36) The method of claim 36, wherein the unladen current is a predetermined value. ### Claim 38 (depends on 32) The method of claim 32, wherein the motor is operated at a substantially constant rotations per minute (RPM). ### Claim 39 (depends on 32) The method of claim 32, wherein the motor operated with a pulse-width modulated (PWM) signal. ### Claim 40 A cleaning system comprising: a motor configured to provide rotational energy to a brush; a current sensor configured to sense current provided to the motor; and a controller having an electronic processor, the controller configured to receive, from the current sensor, a current signal indicative of the current provided to the motor, filter the current signal to produce a filtered current signal, and control the motor based on the filtered current signal, wherein the controller controls the motor based on a first gain value when the current signal is less than a predetermined current threshold, and a second gain value when the current signal is greater than the predetermined current threshold.