Bi-directional motor for gas engine replacement device

Patent metadata

Field	Value
Publication number	US-12209369-B2
Application number	US-202017091886-A
Country	US
Kind code	B2
Filing date	Nov 6, 2020
Priority date	Nov 8, 2019
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Bi-directional motor ( 36 ) for gas engine replacement device ( 10 ). One embodiment provides a gas engine replacement device ( 10 ) including a housing ( 14 ), a battery receptacle ( 54 ), a motor ( 36 ), a power take-off shaft ( 38 ) receiving torque from the motor ( 36 ), a power switching network ( 310 ) configured to selectively provide power to the motor ( 36 ), and an electronic processor ( 302 ) coupled to the power switching network ( 310 ). The electronic processor ( 302 ) is configured to rotate the motor ( 36 ) in a first direction and receive an input to switch a rotation direction of the motor ( 36 ). The electronic processor is also configured to control the power switching network ( 310 ) to stop the motor ( 36 ) and rotate the motor ( 36 ) in a second direction after controlling the power switching network ( 310 ) to stop the motor ( 36 ).

First claim

We claim:

1. A gas-engine replacement device comprising:
a housing;
a battery receptacle coupled to the housing and configured to removably receive a battery pack;
a motor located within the housing;
a power take-off shaft receiving torque from the motor and protruding from a side of the housing;
a power switching network configured to selectively provide power from the battery pack to the motor; and
an electronic processor coupled to the power switching network and configured to control the power switching network to rotate the motor, the electronic processor configured to:
rotate the motor in a first direction,
receive an input to switch a rotation direction of the motor, and
in response to receiving the input to switch the rotation direction of the motor:
(i) control the power switching network to stop the motor by performing one selected from a group consisting of:
coasting the motor to a stop, applying passive braking to stop the motor, applying active braking to stop the motor, and dynamically pulsing the motor in opposite phases to the first direction, and

(ii) after controlling the power switching network to stop the motor in (i), rotate the motor in a second direction.

2. The gas-engine replacement device of claim 1 , further comprising:
elastomeric members positioned on the battery receptacle, wherein the elastomeric members are configured to reduce vibrations transferred from the motor to the battery pack.

3. The gas-engine replacement device of claim 1 , further comprising:
a gear train coupled between an output shaft of the motor and the power take-off shaft, wherein a direction of rotation of the power take-off shaft is switched from the first direction to the second direction without shifting gears of the gear train.

4. The gas-engine replacement device of claim 1 , wherein an operating temperature of an exterior surface of the housing of the gas-engine replacement device is below 95 degrees Celsius.

5. The gas-engine replacement device of claim 1 , further comprising:
a transceiver coupled to the electronic processor for communicating with an external device, wherein the input to switch the rotation direction of the motor is received from the external device.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Gallagher Patrick D
• Bartlett Timothy J
• Obermann Timothy R
• Huber Alexander
• Sprague Connor P
• Glanzer Evan M
• Koller John E

Classifications

• H02K11/0094

  Structural association with other electrical or electronic devices · CPC title

• H02P6/30

  Arrangements for controlling the direction of rotation (H02P6/22 takes precedence) · CPC title

• H02P6/24

  Arrangements for stopping · CPC title

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title