Inverter control apparatus and control method thereof
US-2015381095-A1 · Dec 31, 2015 · US
Electric motor torque control
US9735720B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9735720-B2 |
| Application number | US-201213606992-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 7, 2012 |
| Priority date | Sep 7, 2012 |
| Publication date | Aug 15, 2017 |
| Grant date | Aug 15, 2017 |
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Abstract
Official abstract text for this publication.
A vehicle includes one or more inverter-fed electric machines such as permanent magnet synchronous motors. In response to a torque request, a controller issues commands to an inverter calculated to cause the motor to produce the requested torque. A method of operating the inverter may determine the commands based on the ratio of rotor speed to inverter input voltage, reducing the approximation error associated with multi-dimensional lookup tables. When the speed and voltage vary while maintaining a constant ratio and constant torque request, the issued commands produce a winding current in the electrical machine with constant direct and quadrature components.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of operating an inverter connected to a bus with a bus voltage and also to an electric machine having a rotor speed, the method comprising: receiving a torque request; computing a normalized speed by dividing the rotor speed by the bus voltage; computing a voltage phase angle based on the normalized speed and the torque request; and commanding the inverter to change state when a rotor position equals the voltage phase angle. 2. The method of claim 1 wherein computing the voltage phase angle comprises looking up values in a table. 3. The method of claim 1 further comprising selecting between a six-step control command and a pulse width modulation control command to the inverter based on the normalized speed and the torque request.
Assignees
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Classifications
Operations & Transport · mapped topic
characterised by the form of the current used in the control circuit · CPC title
Torque · CPC title
Cross-Sectional Technologies · mapped topic
by pedal actuation · CPC title
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Frequently asked questions
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- What does patent US9735720B2 cover?
- A vehicle includes one or more inverter-fed electric machines such as permanent magnet synchronous motors. In response to a torque request, a controller issues commands to an inverter calculated to cause the motor to produce the requested torque. A method of operating the inverter may determine the commands based on the ratio of rotor speed to inverter input voltage, reducing the approximation …
- Who is the assignee on this patent?
- Luedtke Daniel, Degner Michael W, Ford Global Tech Llc
- What technology area does this patent fall under?
- Primary CPC classification H02P21/20. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 15 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).