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Power modulating motor control method

A technology of electric motor and power mode, applied in the field of electric motor device, can solve problems such as stall

Active Publication Date: 2018-11-13
OREGON TOOL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when larger branches are encountered, the motor of the hedge trimmer may experience a stall due to the larger branch becoming lodged in the cutting blade of the hedge trimmer.

Method used

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  • Power modulating motor control method
  • Power modulating motor control method
  • Power modulating motor control method

Examples

Experimental program
Comparison scheme
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other Embodiment approach

[0039] Other implementations may vary the continuous current limit based on the characteristics of the power supply 120 . For example, where power supply 120 is implemented as a battery pack, the state of charge and capacity of the battery pack may affect the amount of power that may be delivered. Depending on the characteristics of the battery pack, drawing excessive current may damage the battery pack, and therefore the control system 130 may be configured to set the continuous power limit to not exceed the capacity of the battery pack.

[0040] As will be appreciated by those skilled in the relevant art, the maximum delivered power in the continuous power mode is less than the absolute maximum power at which the electric motor 140 is capable of operating. In one aspect, the absolute maximum power at which the motor 140 is capable of operating may be defined as the maximum current that the motor 140 can draw while still rotating, ie, the current draw before stalling at full ...

other Embodiment approach

[0051] Other embodiments may utilize feedback (eg, temperature sensors) to determine when a component has cooled sufficiently. The above approach of using a temperature sensor may be particularly useful when the tool 100 may be used in an environment where the temperature may vary significantly, since components of the tool 100 may require a greater or lesser amount of time to dissipate accumulated heat depending on the ambient temperature. For example, a power chainsaw may be used any time of the year. When operating during the hot summer months, the components of the tool 100 may take longer to dissipate heat after the boost mode than during winter operation. In winter, denser cold air can dissipate heat more efficiently, and thus allow control system 130 to re-enable boost mode earlier than in summer weather.

[0052] As noted above, in the boost power mode, the control system 130 may provide current to the motor 140 at levels greater than the continuous operating level in...

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Abstract

A electric power tool is provided, comprising a control system electrically coupled to a power supply and a motor to supply current to the motor, where the motor may be coupled to a driven element ofa tool so as to drive the driven element. The control system may have a continuous power mode and a boost power mode to supply current to the motor at a greater amount than in continuous power mode, and may be configured to switch between the continuous power mode and the boost power mode based upon a sensed load on the electric motor. In some embodiments, the control system may switch to a cutback power mode to supply current to the motor at a lower amount than in continuous power mode is the load does not decrease before a predetermined time elapses.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority from the earlier filing date of U.S. Provisional Application No. 62 / 500,958, filed May 3, 2017, the entire contents of which are incorporated herein by reference. technical field [0003] Embodiments herein relate to the field of power tools, and more particularly, to apparatus, methods, and systems for electric motors that automatically adjust their power output in response to load. Background technique [0004] Hand-held power tools such as string trimmers, hedge trimmers, chainsaws and pole saws include electric motors. Take hedge trimmers, for example. These tools are great for cutting large areas of thin branches and stems. However, when larger branches are encountered, the motor of the hedge trimmer may experience a stall due to the larger branches becoming lodged in the cutting blade of the hedge trimmer. Contents of the invention [0005] An embodiment of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/028H02H7/08
CPCH02P29/032H02H7/08A01G3/037A01G3/053A01G3/062H02P29/02H02P29/40A01D34/416A01D34/84B25F5/00B27B17/08
Inventor 诺亚·埃里克森斯蒂芬·琼斯乔纳森·齐林
Owner OREGON TOOL INC