POWER TOOL
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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N/A
Issued Date -
May 21, 2015
app pub date -
Oct 20, 2014
filing date -
Nov 21, 2013
priority date (Note) -
Abandoned
status (Latency Note)
Importance
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US Family Size
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Non-US Coverage
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Abstract
A power tool comprises a motor, an output torque calculation unit configured to calculate an output torque of the motor based on a current flowing through the motor, a friction torque calculation unit configured to calculate a friction torque of the motor based on a rotation speed of the motor, a load torque estimation unit configured to estimate a load torque acting on the motor, an inertia torque calculation unit configured to calculate an inertia torque based on the output torque, the friction torque and the load torque, and a motor deceleration unit configured to stop or decelerate the motor when the inertia torque is greater than an inertia torque reference value.
First Claim
Other Claims data not available
Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| JP | B2 | JP6148609 | Nov 21, 2013 |
| DE | A1 | DE102014016994 | Nov 18, 2014 |
International Classification(s)
- 2014 Application Filing Year
- H02P Class
- 1299 Applications Filed
- 1159 Patents Issued To-Date
- 89.23 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 48 Citation Count
- H02P Class
- 98.99 % this patent is cited more than
- 10 Age