Black Decker Inc.

Michael J Kowalski

Oleksiy P Sergyeyenko

Steven J Phillips

John Charles Vanko

Wong Kun Ng

Michael S Justis

Philip John Martinez

Kathleen A Miller

Raghavendra R Byatnal

Steven Thomas Carpenter

Jared W Rondeau

Jason Thrush

Vivekkumar Kumar

Nazmul Hasan

Arash Rahnamaee

Gregory Besack

David Miller

Raghavendra Byatnal

A cordless compressor has an air storage tank, a pump, a motor for driving the pump, and a controller circuit electrically connected to the motor. A pressure switch assembly is connected to the controller circuit. The pressure switch assembly has first and second pressure switches for sensing pressure within the air storage tank. The controller circuit controls de-activation of the motor depending upon status of the first and second pressure switches.

Cordless compressor

A power tool is provided including a brushless motor having a stator defining a plurality of phases and a rotor. A power unit is provided including power switches operable to deliver power to the motor. A primary controller is interfaced with the power unit to output drive signals to drive the phases of the motor over a series of sectors of the rotor rotation. The primary controller measures a back-electromotive force voltage of the motor and transitions motor commutation from the present sector to the next sector based in relation to the back-EMF voltage. A second controller is provided to receive at least one of the drive signals, calculate a speed and/or direction of rotation of the motor from the drive signals, and take corrective action to cut off supply of power to the motor if it detects an overspeed condition or incorrect direction of rotation.

Dual-controller system for a sensorless brushless motor control

A power tool including a power supply interface, a motor control circuit configured to regulate supply of power from the power supply interface to a motor, and an input unit actuatable by a user. A no-volt prevention circuit receives a first voltage signal from the power supply interface and a second voltage signal from the input unit. The no-volt protection circuit includes a main semiconductor switch arranged on a current path from the power supply interface to at least one component of the motor control circuit, and a resistor-capacitor circuit to turn the main semiconductor switch ON when the input unit is actuated after the power supply interface is coupled to the power supply, but not when the input unit is actuated before to the power supply interface is coupled to the power supply.

Hardware control for prevention of dangerous restart in a power tool

Growing community of inventors

Towson, MD, United States of America

Michael J Kowalski