Methods and apparatus to perform torque balance control of co-shafted motors
US-10158303-B2 · Dec 18, 2018 · US
Observer control, e.g. using Luenberger observers or Kalman filters
Observer control, e.g. using Luenberger observers or Kalman filters · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H02P21/13 |
| Official title | Observer control, e.g. using Luenberger observers or Kalman filters |
| Display label | Observer control, e.g. using Luenberger observers or Kalman filters |
| Total patents | 420 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 15 |
| 2016 | 17 |
| 2017 | 18 |
| 2018 | 27 |
| 2019 | 43 |
| 2020 | 51 |
| 2021 | 58 |
| 2022 | 53 |
| 2023 | 42 |
| 2024 | 39 |
| 2025 | 49 |
| 2026 | 8 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
AC-rotary-machine control device and electric power-steering system provided with AC-rotary-machine control device
US-10116250-B2 · Oct 30, 2018 · US
Fault Tolerant Field Oriented Control for Electric Power Steering
US-2018215409-A1 · Aug 2, 2018 · US
Drive systems including sliding mode observers and methods of controlling the same
US-10008966-B2 · Jun 26, 2018 · US
Detecting position measurement errors in an electric motor system
US-2018138841-A1 · May 17, 2018 · US
System and method for starting synchronous motors
US-2018131305-A1 · May 10, 2018 · US
Power system and motor driving apparatus included in power system
US-9966880-B2 · May 8, 2018 · US
Control device
US-2018076748-A1 · Mar 15, 2018 · US
Sensorless commutation method
US-2018069494-A1 · Mar 8, 2018 · US
Method and system for controlling angular rotor speeds of sensorless induction motors
US-9893666-B2 · Feb 13, 2018 · US
Circuits and methods of determining position and velocity of a rotor
US-9825564-B2 · Nov 21, 2017 · US
Control of motor drives with output sinewave filter capacitor current compensation using sinewave filter transfer function
US-9800190-B2 · Oct 24, 2017 · US
Method and system for controlling an angualr speed of an induction motor
US-9780711-B2 · Oct 3, 2017 · US
Control of motor drives with output sinewave filter capacitor current compensation using sinewave filter transfer function
US-2017222588-A1 · Aug 3, 2017 · US
Apparatus for controlling alternating-current rotary electric machines
US-9705445-B2 · Jul 11, 2017 · US
Method and system for estimating differential inductances in an electric machine
US-9692339-B2 · Jun 27, 2017 · US
Power system and motor driving apparatus included in power system
US-2017179855-A1 · Jun 22, 2017 · US
Feedforward control of motor drives with output sinewave filter
US-2017141712-A1 · May 18, 2017 · US
Variable magnetization machine controller
US-9647583-B2 · May 9, 2017 · US
Systems and Methods for Controlling a Permanent Magnet Synchronous Motor
US-2017126160-A1 · May 4, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H02P21/13?
- CPC H02P21/13 is the Cooperative Patent Classification code for “Observer control, e.g. using Luenberger observers or Kalman filters.”
- How many patents are filed under CPC H02P21/13 (Observer control, e.g. using Luenberger observers or Kalman filters)?
- Our database includes 420 publications tagged with this CPC code.
- Is patent activity under CPC H02P21/13 growing?
- Publication counts under this code: 39 in 2024 vs 49 in 2025 (latest complete years).