公开(公告)号：US10135369B2

公开(公告)日：2018-11-20

申请号：US15278291

申请日：2016-09-28

Applicant: Microchip Technology Incorporated

Inventor： Ward R. Brown ,  Howard Hendricks

IPC: H02P29/66 ,  H02P6/16 ,  H02P27/08

Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.

公开(公告)号：US10003287B2

公开(公告)日：2018-06-19

申请号：US15450999

申请日：2017-03-06

Applicant: Trane International Inc.

Inventor： Nathan Thomas West ,  David Marshall Foye

IPC: H02P6/14 ,  H02P29/66 ,  H02P29/024 ,  H02P21/14 ,  G01R31/34

CPC classification number: H02P6/14 ,  G01R31/34 ,  G01R31/343 ,  H02P21/14 ,  H02P21/141 ,  H02P29/024 ,  H02P29/0241 ,  H02P29/60 ,  H02P29/662

Abstract: Techniques for motor magnet degradation controls and diagnostics are disclosed. An exemplary technique determines q-axis current, d-axis current, q-axis voltage, and/or d-axis voltage of a permanent magnet motor based upon sensed current and voltage information of the motor. This information is utilized to determine flux information. The flux information is utilized in evaluating collective state conditions of a plurality of motor magnets and evaluating localized state conditions of a subset of the plurality of motor magnets. The evaluations can be used to identify degradation or damage to one or more of the magnets which may occur as a result of elevated temperature conditions, physical degradation, or chemical degradation.

公开(公告)号：US20180041156A1

公开(公告)日：2018-02-08

申请号：US15550228

申请日：2015-04-09

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Satoshi KAWAMURA ,  Kenta HATANO

IPC: H02P29/64 ,  H02P29/66 ,  H02K21/14 ,  B60L15/20 ,  H02K11/25

CPC classification number: F16H61/32 ,  B60L15/20 ,  B60L2240/16 ,  B60L2240/36 ,  B60L2240/425 ,  H02K11/25 ,  H02K21/14 ,  H02P7/02 ,  H02P29/60 ,  H02P29/64 ,  H02P29/662 ,  Y02T10/7258

Abstract: A position sensor mounted in an actuator includes a magnetic detecting element for detecting the position of a shaft, and a temperature detecting element for detecting intra-sensor temperature which is used for correction of the temperature characteristics of the magnetic detecting element, the magnetic detecting element and the temperature detecting element being built therein. A control device for the actuator acquires both the temperature-corrected position of the shaft and the intra-sensor temperature from the position sensor, and uses them for control of the actuator.

公开(公告)号：US09825579B2

公开(公告)日：2017-11-21

申请号：US15098768

申请日：2016-04-14

Applicant: FANUC CORPORATION

Inventor： Tatsuya Senoo

IPC: H02P21/14 ,  H02P29/66 ,  H02P29/60

CPC classification number: H02P29/662 ,  H02P29/664 ,  H02P29/67

Abstract: A temperature estimating apparatus for a synchronous motor comprises: a voltage command generating unit for controlling d-phase current by increasing or decreasing d-phase and q-phase voltages; a voltage acquiring unit for d-phase and q-phase voltages when the d-phase current is varied; a rotating speed detecting unit for the synchronous motor; a current detecting unit for the d-phase and q-phase currents; a winding temperature acquiring unit; a winding resistance converting unit for winding resistance from winding temperature; an inductance calculating unit for d-axis inductance based on the variation of the d-phase current and the q-phase voltage and on the rotating speed; a counter electromotive voltage constant calculating unit from the q-phase voltage, the varied d-phase current, the rotating speed, the q-phase current, the winding resistance, and the d-axis inductance; and a magnet temperature estimating unit for estimating magnet temperature based on the counter electromotive voltage constant.

公开(公告)号：US09712103B2

公开(公告)日：2017-07-18

申请号：US15117303

申请日：2014-09-19

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

Inventor： Shogo Miyamoto

IPC: H02P6/00 ,  H02P29/66 ,  H02P6/08 ,  F04B17/03 ,  F04B49/02 ,  F16H61/00

CPC classification number: H02P29/66 ,  F04B17/03 ,  F04B49/02 ,  F04B2203/0201 ,  F04B2203/0205 ,  F04B2203/0209 ,  F16H61/0025 ,  H02P6/08 ,  H02P23/14 ,  H02P29/032 ,  H02P29/662

Abstract: The controller for an actuator that is driven by a brushless motor estimates the temperature of the magnet in the brushless motor on the basis of an electric current value and a rotation speed thereof which are obtained by supplying power to rotate the brushless motor in a reverse direction, and limits current flowing through the brushless motor during forward rotation so as to prevent the magnet temperature from rising beyond an allowable maximum temperature. Limiting the current flowing through the brushless motor on the basis of the estimated magnet temperature makes it possible to drive the brushless motor while preventing the magnet temperature from rising beyond the allowable maximum temperature without providing the brushless motor with any temperature sensor for detecting the magnet temperature therein.

公开(公告)号：US20170155353A1

公开(公告)日：2017-06-01

申请号：US15324498

申请日：2015-05-07

Applicant: Robert Bosch GmbH

Inventor： Wei-Lung Lee

IPC: H02P29/66

CPC classification number: H02P29/664 ,  H02P29/66

Abstract: The invention relates to a method for determining a rotor temperature of an electric motor, in particular an asynchronous motor, the rotor temperature being determined at least in accordance with reactive powers and/or in accordance with losses of the electric motor. A first rotor temperature is determined in accordance with the reactive powers and, depending on an operating range of the electric motor, plausibility-checked or replaced by a second rotor temperature, which is determined in accordance with the losses.

公开(公告)号：US20240339950A1

公开(公告)日：2024-10-10

申请号：US18575682

申请日：2022-06-03

Applicant: Siemens Aktiengesellschaft

Inventor： CHRISTOPH FRITSCH ,  STEFAN KÜNZEL

IPC: H02P29/66

CPC classification number: H02P29/662

Abstract: A temperature determination method for magnet temperatures on magnets of electric motors has a test mode. A first voltage is applied to a test winding of a test motor with test magnets for impressing a first voltage-time area at first angles of a test motor rotating field. The test magnets are subject to a predefined magnet temperature. First current values are ascertained at the first angles and stored based on the predefined magnet temperature. In a normal mode, a second voltage is applied to a motor winding of an operations motor with motor magnets for impressing a second voltage-time area at second angles of a motor rotating field. The motor magnets have an operation-dependent magnet temperature. Second current values are determined at the second angles and stored based on the operation-dependent magnet temperature. The operation-dependent magnet temperature is determined by comparing a second current value with a first current value.

公开(公告)号：US12040661B2

公开(公告)日：2024-07-16

申请号：US17569964

申请日：2022-01-06

Applicant: ZF Friedrichshafen AG

Inventor： Jochen Eggler ,  Ulrich Kehr

IPC: H02K1/276 ,  H02P6/21 ,  H02P29/66

CPC classification number: H02K1/2766 ,  H02P6/21 ,  H02P29/66

Abstract: A rotor (1) for an electric machine (2) includes a rotor body with multiple poles. Multiple flux barriers (6.1, 6.2, 6.3, 6.4) are formed in the interior of the rotor body. The rotor (1) further includes at least one sensor element (3) configured for detecting at least one condition variable of the rotor (1), a signal processing unit (4) connected to the at least one sensor element (3) and configured for generating measured data from the detected condition variable of the rotor (1) and transmitting the measured data to a control device (5), and at least one induction coil (7) that includes at least one electrical conductor (8), is arranged in at least one flux barrier (6.1) of the rotor (1), and is configured for generating electrical energy from a leakage magnetic field in this flux barrier (6.1).

公开(公告)号：US12021415B2

公开(公告)日：2024-06-25

申请号：US17577477

申请日：2022-01-18

Applicant: ZF Friedrichshafen AG

Inventor： Jochen Eggler ,  Ulrich Kehr

IPC: H02K1/276 ,  H02P6/21 ,  H02P29/66

CPC classification number: H02K1/276 ,  H02P6/21 ,  H02P29/66

Abstract: A rotor (1) for an electric machine (2) has a rotor body including multiple poles. The rotor (1) further has at least one sensor element (3) for detecting at least one condition variable of the rotor (1), and a signal processing unit (4) connected to the at least one sensor element (3). The signal processing unit (4) is configured to generate measured data from the condition variable of the rotor (1) and to transmit the measured data to a control device (5). Additionally, the rotor (1) has at least one induction coil (7), where each of the at least one induction coil (7) includes at least one electrical conductor (8). The at least one induction coil (7) is arranged at the rotor (1) and is configured to generate electrical energy from a magnetic field that is temporally changing during operation of the electric machine (2).

公开(公告)号：US20240014765A1

公开(公告)日：2024-01-11

申请号：US18042776

申请日：2021-10-13

Applicant: FANUC CORPORATION

Inventor： Yohei KAMIYA

IPC: H02P29/64 ,  H02P29/66

CPC classification number: H02P29/64 ,  H02P29/662

Abstract: In the present invention, an electric motor model comprises: a model of a coil of a stator; and a model of a temperature detector for detecting the temperature of the coil. A parameter such as a thermal capacity is included in the electric motor model. Provided is a parameter setting unit comprising a parameter calculation unit that calculates a parameter so that a change in the temperature of the model of the temperature detector corresponds to a change in the actual temperature. The parameter calculation unit includes an evaluation unit that evaluates the temperature of the model of the temperature detector, the temperature having been calculated using the temporarily set parameter. The evaluation unit evaluates the temperature of the model of the temperature detector without evaluating any variables besides the temperature of the model of the temperature detector.