Motor Controller
US-2018083564-A1 · Mar 22, 2018 · US
Motor control unit
US10348235B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10348235-B2 |
| Application number | US-201816100808-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 10, 2018 |
| Priority date | Aug 29, 2017 |
| Publication date | Jul 9, 2019 |
| Grant date | Jul 9, 2019 |
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- Title
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Abstract
Official abstract text for this publication.
A motor control unit includes a PWM count changer that when, out of all possible combinations of any two of three phases, at least one of the combinations has a difference in PWM count less than a threshold value, changes a PWM count of at least one of the two phases of the at least one of the combinations for each of PWM periods within a current control period, without changing the total of the PWM counts of the at least one of the two phases within the current control period, such that each of the combinations has a difference in PWM count greater than or equal to the threshold value.
First claim
Opening claim text (preview).
What is claimed is: 1. A motor control unit for controlling a three-phase electric motor on a basis of PWM signals that are generated for each of a plurality of PWM periods included in a current control period, the motor control unit comprising: a PWM count generator that generates PWM counts of three phases for each current control period; a PWM count setter that sets the PWM counts of the three phases generated for a specific current control period by the PWM count generator, as PWM counts of the respective phases for each of the plurality of PWM periods within the specific current control period; a PWM count changer that when, out of all possible combinations of any two of the three phases, at least one of the combinations has a difference in PWM count less than a threshold value, changes the PWM count of at least one of the two phases of the at least one of the combinations for each of the plurality of PWM periods within the specific current control period, without changing a total of the PWM counts of the at least one of the two phases within the specific current control period, such that each of the combinations has a difference in PWM count greater than or equal to the threshold value; and a PWM signal generator that generates the PWM signals for the respective phases for each of the plurality of PWM periods, on the basis of the PWM counts that are set for the respective phases for each of the plurality of PWM periods within the specific current control period and that are changed by the PWM count changer. 2. The motor control unit according to claim 1 , wherein the PWM count changer changes one of the two phases that have the difference in PWM count less than the threshold value, without changing the total of the PWM counts of the one of the two phases within the specific current control period, such that each of the combinations has the difference in PWM count greater than or equal to the threshold value. 3. The motor control unit according to claim 1 , wherein the PWM count changer changes both the two phases that have the difference in PWM count less than the threshold value, without changing the total of the PWM counts of each of the two phases within the specific current control period, such that each of the combinations has the difference in PWM count greater than or equal to the threshold value.
Assignees
Inventors
Classifications
Speed loop, i.e. comparison of the motor speed with a speed reference · CPC title
Current loop, i.e. comparison of the motor current with a current reference · CPC title
- H02P27/08Primary
with pulse width modulation · CPC title
- H02P21/22Primary
Current control, e.g. using a current control loop · CPC title
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation · CPC title
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Frequently asked questions
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- What does patent US10348235B2 cover?
- A motor control unit includes a PWM count changer that when, out of all possible combinations of any two of three phases, at least one of the combinations has a difference in PWM count less than a threshold value, changes a PWM count of at least one of the two phases of the at least one of the combinations for each of PWM periods within a current control period, without changing the total of th…
- Who is the assignee on this patent?
- Jtekt Corp
- What technology area does this patent fall under?
- Primary CPC classification H02P27/08. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 09 2019 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).