Multi-blade motor control by single power stage
AssigneeParker-Hannifin Corporation
InventorsMichael S. Bachman, Roger White
Life of this patent
Estimating the term…
Abstract
An apparatus for motor control of a lawnmower includes multiple blade motors, a logic circuit and a power circuit. The plurality of blade motors are coupled to the lawnmower and configured for cutting vegetation. The logic circuit configured to receive a feedback signal from each of the plurality of blade motors and generate an output signal. The power circuit is configured to drive each of the plurality of blade motors simultaneously in response to the output signal such that the speed of all of the plurality of blade motors is lowered when the feedback signal indicates that one of the plurality of blade motors has encountered an obstruction, clog, or another type of high load.
Claims17
An apparatus for motor control of a lawnmower, the apparatus comprising:
- a plurality of blade motors coupled to the lawnmower;
- a logic circuit configured to receive a feedback signal from each of the plurality of blade motors and generate an output signal;
- and
- a power section configured to drive each of the plurality of blade motors simultaneously in response to the output signal, the logic circuit being further configured to compare the feedback signal to a threshold, and the power section is further configured to drive each of the plurality of blade motors to a slow speed or an initial speed when the feedback signal exceeds the threshold.
An apparatus for motor control of a lawnmower, the apparatus comprising:
- a plurality of blade motors coupled to the lawnmower;
- and
- a controller configured to:
- receive a feedback signal from each of the plurality of blade motors;
- compare the feedback signal to a threshold;
- and
- generate a drive signal to drive each of the plurality of blade motors simultaneously in response to the feedback signal, the drive signal instructing each of the plurality of blade motors to a slow speed or an initial speed when the feedback signal exceeds the threshold.
A method for motor control of a lawnmower, the method comprising:
- receiving feedback data for an obstructed motor of a plurality of blade motors;
- performing a comparison of the feedback data to a threshold;
- and
- generating a reset signal for a plurality of blade motors in response to the comparison, the reset signal including a proportional multiplier of a target speed for the plurality of blade motors.
Dependencies are inferred from the claim text.