Angular position estimation for PM motors

Patent metadata

Field	Value
Publication number	US-10498268-B2
Application number	US-201715615074-A
Country	US
Kind code	B2
Filing date	Jun 6, 2017
Priority date	Sep 24, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A method of determining the angular position (θ) of a rotor of an N-phase permanent magnet motor (PMM) includes providing a processor having an associated memory, wherein the memory stores an angular position determination (APD) equation or hardware is included implementing the APD equation. The APD equation determines the angular position from N-phase measurements obtained from the stator windings associated with each of the N-phases. A voltage or a current is forced upon the stator terminals of the stator windings for each of the N-phases, a resulting stator current or stator voltage is sensed to provide the N-phase measurements responsive to the forcing of the voltage or current, and the APD equation is used to determine the angular position from the N-phase measurements.

First claim

The invention claimed is:

1. A method comprising:
obtaining, by a controller, N phase measurements for an N-phase permanent magnetic motor (PMM), wherein N is an integer greater than 1;
determining, by the controller, an angle of a rotor of the N-phase PMM using an angular position determining (APD) equation;
determining, by the controller, pulse width modulation (PWM) durations for the N phases of the N-phase PMM based on the angle of the rotor; and
transmitting, by the controller, the PWM durations for the N phases of the N-phase PMM.

2. The method of claim 1 , wherein the N phase measurements are N current levels for the N phases.

3. The method of claim 1 , wherein the N phase measurements are N voltage levels for the N phases.

4. The method of claim 1 , wherein the controller comprises:
a processor; and
a non-transitory computer readable storage medium storing a program for execution by the processor.

5. The method of claim 4 , wherein the processor is a microcontroller unit (MCU).

6. The method of claim 1 , wherein the controller comprises a field-programmable gate array (FPGA) implementing a logic gate pattern or an application-specific integrated circuit (ASIC) implementing the logic gate pattern.

7. The method of claim 1 , wherein the APD is:

angle
=

tan

-
1

(

-

∑

n
=
1

N

⁢

x
n

·

sin
⁡

(

2
⁢

⁢

π
·

(

n
-
1

)

N

)

∑

n
=
1

N

⁢

x
n

·

cos
⁡

(

2
⁢

⁢

π
·

(

n
-
1

)

N

)

)

,

wherein x n is the phase measurement of the nth phase.

8. The method of claim 1 , wherein the APD is:

angle
=

tan

-
1

(

(

∑

n
=
1

N

⁢

A
n
2

⁢

sin
⁡

(

2
⁢

⁢

π
·

(

n
-
1

)

N

)

⁢

Assignees

• Texas Instruments Inc

Inventors

• Magee David Patrick
• Thomas Eric James

Classifications

• H02P6/182 Primary

  using back-emf in windings · CPC title