Machine protection device and machine protection method
US-2021044247-A1 · Feb 11, 2021 · US
Inverter device for capable of performing overheating protection to switching elements when driving electric motor and control method thereof
US12255545B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12255545-B2 |
| Application number | US-202217752875-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 25, 2022 |
| Priority date | May 26, 2021 |
| Publication date | Mar 18, 2025 |
| Grant date | Mar 18, 2025 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The disclosure provides an inverter device for driving an electric motor, including: an inverter circuit including a plurality of switching elements; and a control circuit controlling the inverter circuit. When a rotation speed of the electric motor is equal to or less than a preset rotation speed threshold and a torque of the electric motor is equal to or greater than a preset torque threshold, the control circuit changes a temperature estimation logic of the switching elements of the inverter circuit.
First claim
Opening claim text (preview).
What is claimed is: 1. An inverter device for driving an electric motor, comprising: an inverter circuit comprising a plurality of switching elements; and a control circuit controlling the inverter circuit, wherein in response to a rotation speed of the electric motor being equal to or less than a preset rotation speed threshold and a torque of the electric motor being equal to or greater than a preset torque threshold, the control circuit changes a temperature estimation logic of the switching elements of the inverter circuit, the temperature estimation logic comprises a normal estimation logic and a lock state estimation logic, the lock state estimation logic is used to estimate a temperature in response to the rotation speed of the electric motor being equal to or less than the preset rotation speed threshold and the torque of the electric motor being equal to or greater than the preset torque threshold, and a difference between a temperature estimated according to the lock state estimation logic and an actual temperature of the switching elements is less than a difference between a temperature estimated according to the normal estimation logic and the actual temperature of the switching elements under a same condition. 2. The inverter device for driving the electric motor according to claim 1 , wherein the inverter circuit is a three-phase inverter circuit which comprises six switching elements that respectively define three-phase circuits of an upper bridge arm and a lower bridge arm, and the control circuit changes the temperature estimation logic of the switching elements of the inverter circuit in response to only any one phase of the upper bridge arm is turned on and only any one of the other two phases of the lower bridge arm is turned on.
Assignees
Inventors
Classifications
Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence) · CPC title
Controlling or determining the temperature of the motor or of the drive (H02P29/02 takes precedence) · CPC title
using a control circuit common to several phases of a multi-phase system · CPC title
using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title
against abnormal temperatures · CPC title
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Frequently asked questions
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- What does patent US12255545B2 cover?
- The disclosure provides an inverter device for driving an electric motor, including: an inverter circuit including a plurality of switching elements; and a control circuit controlling the inverter circuit. When a rotation speed of the electric motor is equal to or less than a preset rotation speed threshold and a torque of the electric motor is equal to or greater than a preset torque threshold…
- Who is the assignee on this patent?
- Nidec Elesys Corp
- What technology area does this patent fall under?
- Primary CPC classification H02M7/53871. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 18 2025 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).