Motor control unit, failure detecting method, and electric power steering apparatus and vehicle equipped with the same
US-10232875-B2 · Mar 19, 2019 · US
Electric-motor driving device and refrigeration-cycle application apparatus including electric-motor driving device
US11070161B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11070161-B2 |
| Application number | US-201716465174-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 9, 2017 |
| Priority date | Mar 9, 2017 |
| Publication date | Jul 20, 2021 |
| Grant date | Jul 20, 2021 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
An electric-motor driving device includes an inverter connected to terminals connected to windings of an electric motor including the windings, the inverter applying an alternating-current voltage to the electric motor, a switching unit connected to the terminals and capable of switching a connection state between the terminals, a detecting unit that detects at least one of a voltage and an electric current of the inverter, and a control unit that determines on the basis of a detection value detected by the detecting unit that an abnormality occurs in the switching unit and controls the inverter to short-circuit at least two of the terminals.
First claim
Opening claim text (preview).
The invention claimed is: 1. An electric-motor driving device comprising: an inverter connected to terminals connected to windings of an electric motor including the windings, the inverter applying an alternating-current voltage to the electric motor; switching circuitry being capable of switching a connection state between the terminals, the switching circuitry being connected to the terminals; a detector to detect at least one of a voltage on an input side of the inverter and an electric current of the inverter; and processing circuitry to determine, on a basis of a detection value detected by the detector, that an abnormality occurs in the switching circuitry and control the inverter to short-circuit at least two of the terminals. 2. The electric-motor driving device according to claim 1 , wherein, when determining that an abnormality occurs in the switching circuitry, the processing circuitry controls the inverter to repeat short-circuit and release between the at least two of the terminals. 3. The electric-motor driving device according to claim 1 , wherein the processing circuitry controls the inverter to short-circuit terminals between which a counterelectromotive voltage of the electric motor is largest among the terminals. 4. The electric-motor driving device according to claim 1 , wherein a material of a switching element configuring the inverter is a wide bandgap semiconductor. 5. The electric-motor driving device according to claim 1 , wherein the switching circuitry is capable of switching a winding state of the electric motor to Y wire connection or Δ wire connection. 6. A refrigeration-cycle application apparatus comprising: the electric-motor driving device according to claim 1 ; and a refrigeration cycle including the electric motor.
Assignees
Inventors
Classifications
wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa · CPC title
- H02P29/0241Primary
the fault being an overvoltage · CPC title
of motor-compressor units · CPC title
by short-circuit or resistive braking · CPC title
using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title
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Frequently asked questions
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- What does patent US11070161B2 cover?
- An electric-motor driving device includes an inverter connected to terminals connected to windings of an electric motor including the windings, the inverter applying an alternating-current voltage to the electric motor, a switching unit connected to the terminals and capable of switching a connection state between the terminals, a detecting unit that detects at least one of a voltage and an ele…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification H02P29/0241. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 20 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).