Apparatus for controlling controlled variable of rotary machine to command value
US-9531313-B2 · Dec 27, 2016 · US
Estimation of torque
Estimation of torque · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H02P21/20 |
| Official title | Estimation of torque |
| Display label | Estimation of torque |
| Total patents | 517 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 32 |
| 2016 | 31 |
| 2017 | 30 |
| 2018 | 27 |
| 2019 | 41 |
| 2020 | 50 |
| 2021 | 47 |
| 2022 | 63 |
| 2023 | 53 |
| 2024 | 65 |
| 2025 | 63 |
| 2026 | 15 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Motor controller, flux command generator, and method for generating flux command
US-2016373043-A1 · Dec 22, 2016 · US
System and method for optimizing flux regulation in electric motors
US-9520821-B1 · Dec 13, 2016 · US
Rotary electric machine control system and rotary electric machine control method
US-9515583-B2 · Dec 6, 2016 · US
Apparatus for controlling rotary electric machine
US-2016352269-A1 · Dec 1, 2016 · US
Control apparatus for AC motor
US-9473059-B2 · Oct 18, 2016 · US
Torque error detection and torque estimation system
US-9448135-B2 · Sep 20, 2016 · US
Methods of torque estimation and compensation and systems thereof
US-9442029-B2 · Sep 13, 2016 · US
Driving apparatus for electric motor
US-2016261218-A1 · Sep 8, 2016 · US
Direct torque control of ac electric machines
US-2016254771-A1 · Sep 1, 2016 · US
Load torque estimation apparatus, image forming apparatus, load torque estimation method and recording medium
US-2016248360-A1 · Aug 25, 2016 · US
Electric motor control device and electric motor control method
US-9425722-B2 · Aug 23, 2016 · US
Apparatus for controlling AC motor
US-9413281-B2 · Aug 9, 2016 · US
Control device for rotating electrical machine
US-9413278-B2 · Aug 9, 2016 · US
Controller and control method for rotary electric machine
US-2016204727-A1 · Jul 14, 2016 · US
Control device for rotary machine, and electric power steering apparatus
US-2016200352-A1 · Jul 14, 2016 · US
Motor controller
US-2016190967-A1 · Jun 30, 2016 · US
Method and device for monitoring a torque of an electric motor
US-9369079-B2 · Jun 14, 2016 · US
Apparatus, system, and method for controlling a handrail of an escalator
US-2016152447-A1 · Jun 2, 2016 · US
Methods and apparatuses for compensating for friction torques of permanent magnet synchronous motors
US-9350279-B2 · May 24, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H02P21/20?
- CPC H02P21/20 is the Cooperative Patent Classification code for “Estimation of torque.”
- How many patents are filed under CPC H02P21/20 (Estimation of torque)?
- Our database includes 517 publications tagged with this CPC code.
- Is patent activity under CPC H02P21/20 growing?
- Publication counts under this code: 65 in 2024 vs 63 in 2025 (latest complete years).