公开(公告)号：US11114966B2

公开(公告)日：2021-09-07

申请号：US16861391

申请日：2020-04-29

Applicant: Danfoss Editron Oy

Inventor： Anssi Sakari Sinervo

IPC: H02P21/24 ,  H02P21/18 ,  H02P25/02 ,  H02P27/08

Abstract: A device for estimating a rotation speed and/or a direction of rotation of an induction machine is presented. The device controls stator voltages (uu, uv, uw) of the induction machine so that a voltage space-vector constituted by the stator voltages has a fixed direction and a current space-vector constituted by stator currents (iu, iv, iw) of the induction machine has a pre-determined length or a predetermined d-component. The rotation speed and/or the direction of rotation is/are estimated based on a waveform of a q-component of the current space-vector, where the d-component of the current space-vector is parallel with the voltage space-vector and the q-component of the current space-vector is perpendicular to the voltage space-vector. The device is usable when the induction machine does not have enough magnetic flux for flux-based determination of the rotation speed and/or the direction of rotation.

公开(公告)号：US20210041842A1

公开(公告)日：2021-02-11

申请号：US16963966

申请日：2019-01-21

Applicant: Danfoss Editron Oy

Inventor： Antti Tarkiainen ,  Risto Tiainen ,  Matti Iskanius

IPC: G05B19/042

Abstract: A device-system comprises parallel operating devices (105-107) for driving an operating quantity towards a target value, and a control system for controlling each device at least partly based on a device-specific integral term relating to a time integral of a device-specific error signal that is indicative of a deviation of the operating quantity from the target value. The control system comprises a stabilizing system that computes an arithmetic average of the device-specific integral terms and corrects the device-specific integral terms towards the computed arithmetic average. The correction of the device-specific integral terms makes it possible to avoid unwanted drifts in the device-specific integral terms in a situation where there are differences between the device-specific error signals. The devices can be peers to each other and thus redundancy is achieved because one device can be removed from or added to the device-system without actions from the other devices.

公开(公告)号：US10742036B2

公开(公告)日：2020-08-11

申请号：US15953727

申请日：2018-04-16

Applicant: DANFOSS EDITRON OY

Inventor： Kimmo Tapio Rauma ,  Tero Jarvelainen

IPC: H02J3/32 ,  H02M3/158 ,  H02H7/12 ,  H02M3/155 ,  H02J4/00 ,  H02J1/08 ,  H02J1/10 ,  H02J7/00 ,  B63H21/17 ,  H02P5/74 ,  H02J7/34

Abstract: A power converter comprises an inductor coil whose first pole is connected to an input terminal of the power converter, a controllable switch between the ground and a second pole of the inductor coil, a first unidirectionally conductive component providing a path for electric current from the inductor coil towards an output terminal of the power converter when the controllable switch is non-conductive, and an over-current protector at the output terminal. The power converter comprises a second unidirectionally conductive component for conducting electric current from the input terminal to the over-current protector in a fault situation where voltage at the output terminal is smaller than voltage at the input terminal. Thus, the second unidirectionally conductive component constitutes a low-inductance bypass route for fault current and enables the over-current protector to react fast to a fault situation.

公开(公告)号：US20200186068A1

公开(公告)日：2020-06-11

申请号：US16793229

申请日：2020-02-18

Applicant: Danfoss Editron Oy

Inventor： Antti TARKIAINEN ,  Antti SUMMANEN

IPC: H02P17/00 ,  H02M3/04 ,  B60L50/15 ,  B60L50/16 ,  B60L50/13 ,  H02P27/00 ,  H02P9/00

Abstract: An electric system of an electromechanical power transmission chain is provided that includes a first capacitive circuit, converter equipment between the first capacitive circuit and an electric machine, a second capacitive circuit, and a direct voltage converter between the first and second capacitive circuits. The electromechanical power transmission chain is a parallel transmission chain where the electric machine is mechanically connected to a combustion engine and to one or more actuators. The electric system includes a control system for controlling the direct voltage converter in response to changes in a first direct voltage of the first capacitive circuit and for controlling the converter equipment in response to changes in a second direct voltage of the second capacitive circuit. The first direct voltage is kept on a predetermined voltage range whereas the second direct voltage is allowed to fluctuate in order to respond to peak power needs.