公开(公告)号：US11682995B2

公开(公告)日：2023-06-20

申请号：US17687804

申请日：2022-03-07

Applicant: Turntide Technologies Inc.

Inventor： Mahesh Krishnamurthy ,  Trevor Creary ,  Piyush Desai ,  Mark Johnston

IPC: H02P25/098 ,  H02K37/04

CPC classification number: H02P25/098 ,  H02K37/04 ,  H02K2213/03

Abstract: The present embodiment is a high rotor pole switched reluctance machine (HRSRM) which provides a plurality of combinations of the number of rotor poles Rn and number of stator poles Sn utilizing a numerical relationship defined by a mathematical formula, Rn=2Sn−Fp, when Sn=m×Fp, wherein Fp is the maximum number of independent flux paths in the stator when stator and rotor poles are fully aligned, and m is the number of phases. The mathematical formulation provides an improved noise performance and design flexibility to the machine. The mathematical formulation further provides a specific number of stator and rotor poles for a chosen m and Fp. The HRSRM can be designed with varying number of phases. The HRSRM provides a smoother torque profile due to a high number of strokes per revolution.

公开(公告)号：US11784598B2

公开(公告)日：2023-10-10

申请号：US17681787

申请日：2022-02-27

Applicant: Turntide Technologies Inc.

Inventor： Trevor A. Creary ,  Mahesh Krishnamurthy ,  Piyush C. Desai ,  Mark Johnston ,  Timothy Knodel

IPC: H02P25/08 ,  H02P25/089 ,  H02P25/092

CPC classification number: H02P25/089 ,  H02P25/092 ,  H02P2203/01 ,  H02P2205/01

Abstract: A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter.

公开(公告)号：US20220190765A1

公开(公告)日：2022-06-16

申请号：US17681787

申请日：2022-02-27

Applicant: Turntide Technologies Inc.

Inventor： Trevor A. Creary ,  Mahesh Krishnamurthy ,  Piyush C. Desai ,  Mark Johnston ,  Timothy Knodel

IPC: H02P25/089 ,  H02P25/092

Abstract: A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter.

公开(公告)号：US11342872B2

公开(公告)日：2022-05-24

申请号：US17239566

申请日：2021-04-24

Applicant: Turntide Technologies Inc.

Inventor： Mahesh Krishnamurthy ,  Trevor Creary

IPC: H02P25/08 ,  H02P25/089 ,  H02P6/185 ,  H02P6/18

Abstract: A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.

公开(公告)号：US12132427B2

公开(公告)日：2024-10-29

申请号：US18116508

申请日：2023-03-02

Applicant: Turntide Technologies Inc.

Inventor： Trevor Creary ,  Mahesh Krishnamurthy ,  Tim Knodel

IPC: H02P25/089 ,  H02P6/18

CPC classification number: H02P25/089 ,  H02P6/186 ,  H02P2203/01 ,  H02P2203/03 ,  H02P2203/09

Abstract: A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

公开(公告)号：US11929697B2

公开(公告)日：2024-03-12

申请号：US17750503

申请日：2022-05-23

Applicant: Turntide Technologies Inc.

Inventor： Mahesh Krishnamurthy ,  Trevor Creary

IPC: H02P25/08 ,  H02P6/18 ,  H02P6/185 ,  H02P25/089

CPC classification number: H02P25/089 ,  H02P6/185 ,  H02P6/186

Abstract: A system and method for reliable control of a high rotor pole switched reluctance machine (HRSRM) utilizing a sensorless reliable control system. The method comprising: energizing at least one of the plurality of stator phases; measuring a first current value and time taken by the first current value to reach a first peak value or preset threshold value of current; determining a self-inductance value; measuring a second current value and time taken by an adjacent un-energized stator phase to reach a second peak value of current; determining a mutual inductance value; and estimating a rotor position utilizing the self-inductance and mutual inductance values; and controlling the HRSRM based on the estimated rotor position.

公开(公告)号：US11601081B2

公开(公告)日：2023-03-07

申请号：US17516044

申请日：2021-11-01

Applicant: Turntide Technologies Inc.

Inventor： Trevor Creary ,  Mahesh Krishnamurthy ,  Tim Knodel

IPC: H02P25/089 ,  H02P6/18

Abstract: A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

公开(公告)号：US20220085804A1

公开(公告)日：2022-03-17

申请号：US17536058

申请日：2021-11-28

Applicant: Turntide Technologies Inc.

Inventor： Alejandro Pozo Arribas ,  Mahesh Krishnamurthy

IPC: H03K17/60 ,  H01L29/10 ,  H01L29/08 ,  H01L29/16 ,  H03K17/06 ,  H03K17/14 ,  H03F3/217

Abstract: A gate driver circuit comprises a sensor, an amplifier, a regulator, and a gate driver. The sensor is configured to sense a collector-emitter voltage and includes a first resistor and a second resistor connected in series, a high voltage diode connected between the series connected first and second resistors and a first capacitor connected parallel to the second resistor. The amplifier is configured to amplify a sensor output voltage and includes a non-inverting operational amplifier controlled by means of a plurality of resistors, a voltage follower connected to an output terminal of the non-inverting operational amplifier through a first diode and a third resistor connected across the first diode and the voltage follower. The regulator is configured to regulate a regulator output voltage based on an amplifier voltage. The gate driver is configured to connect/disconnect the regulator output voltage to the base terminal of the BJT.

公开(公告)号：US11264932B2

公开(公告)日：2022-03-01

申请号：US16945269

申请日：2020-07-31

Applicant: Turntide Technologies Inc.

Inventor： Trevor A. Creary ,  Mahesh Krishnamurthy ,  Piyush C. Desai ,  Mark Johnston ,  Timothy Knodel

IPC: H02K23/00 ,  H02P25/089 ,  H02P25/092

Abstract: A method and apparatus for quasi-sensorless adaptive control of a high rotor pole switched-reluctance motor (HRSRM). The method comprises the steps of: applying a voltage pulse to an inactive phase winding and measuring current response in each inactive winding. Motor index pulses are used for speed calculation and to establish a time base. Slope of the current is continuously monitored which allows the shaft speed to be updated multiple times and to track any change in speed and fix the dwell angle based on the shaft speed. The apparatus for quasi-sensorless control of a high rotor pole switched-reluctance motor (HRSRM) comprises a switched-reluctance motor having a stator and a rotor, a three-phase inverter controlled by a processor connected to the switched-reluctance motor, a load and a converter.