US 2026/0302991 A1Published application

Optimized control for dual wound synchronous motor drives with asymmetric supply voltages

OwnerPrerit Pramod, Prathima Nuli +1inventors

InventorsPrerit Pramod, Prathima Nuli, Krishna MPK Namburi

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Abstract

A method of controlling a dual wound synchronous machine (DWSM) includes: determining a positive virtual lower voltage limit based on a first DC supply voltage and a second DC supply voltage; determining, based on the positive virtual lower voltage limit, a maximum torque for symmetric operation; determining, based on the maximum torque for symmetric operation, a requirement for asymmetric currents to operate the DWSM in accordance with a torque command; determining, based on the positive virtual lower voltage limit, and in response to the requirement for asymmetric currents, a set of final asymmetric motor current commands; determining first and second final current commands by applying a mathematical transformation to the set of final asymmetric motor current commands; and commanding first and second inverters to apply corresponding first and second output voltages to corresponding ones of the first and second winding sets.

Claims20

Dependent claims

A method of controlling a dual wound synchronous machine (DWSM) having a first winding set and a second winding set, the method comprising:

determining a positive virtual lower voltage limit (VpL) based on a first DC supply voltage and a second DC supply voltage;
determining, based on the positive virtual lower voltage limit (VpL), a maximum torque for symmetric operation (TepkLP, TepkLN);
determining, based on the maximum torque for symmetric operation (TepkLP, TepkLN), a requirement for asymmetric currents to operate the DWSM in accordance with a torque command
(
T
e
*
)
;
determining, based on the positive virtual lower voltage limit (VpL), and in response to the requirement for asymmetric currents, a set of final asymmetric motor current commands;
determining a first final current command
(
I
d
⁢
1
*
,
I
q
⁢
1
*
)
and a second final current command
(
I
d
⁢
2
*
,
I
q
⁢
2
*
)
by applying a mathematical transformation to the set of final asymmetric motor current commands;
commanding, based on the first final current command
(
I
d
⁢
1
*
,
I
q
⁢
1
*
)
,
a first inverter to apply a first output voltage to the first winding set and thereby causing a first output current to be generated in the first winding set in accordance with the first final current command
(
I
d
⁢
1
*
,
I
q
⁢
1
*
)
;
and
commanding, based on the second final current command
(
I
d
⁢
2
*
,
I
q
⁢
2
*
)
,
a second inverter to apply a second output voltage to the second winding set and thereby causing a second output current to be generated in the second winding set in accordance with the second final current command
(
I
d
⁢
2
*
,
I
q
⁢
2
*
)
.

97 more elements

A system for controlling a dual wound synchronous machine (DWSM) having a first winding set and a second winding set, the system comprising:

a first inverter configured to selectively conduct current from a first DC voltage source having a first DC supply voltage, and to thereby apply a first output voltage to the first winding set of the DWSM;
a second inverter configured to selectively conduct current from a second DC voltage source having a second DC supply voltage, and to thereby apply a second output voltage to the second winding set of the DWSM;
and
a controller configured to:
determine a positive virtual lower voltage limit (VpL) based on the first DC supply voltage and the second DC supply voltage;
determine, based on the positive virtual lower voltage limit (VpL), a maximum torque for symmetric operation (TepkLP, TepkLN);
determine, based on the maximum torque for symmetric operation (TepkLP, TepkLN), a requirement for asymmetric currents to operate the DWSM in accordance with a torque command
(
T
e
*
)
;
determine, based on the positive virtual lower voltage limit (VpL), and in response to the requirement for asymmetric currents, a set of final asymmetric motor current commands;
determine a first final current command
(
I
d
⁢
1
*
,
I
q
⁢
1
*
)
and a second final current command
(
I
d
⁢
2
*
,
I
q
⁢
2
*
)
by applying a mathematical transformation to the set of final asymmetric motor current commands;
command, based on the first final current command
(
I
d
⁢
1
*
,
I
q
⁢
1
*
)
,
the first inverter to apply the first output voltage to the first winding set and thereby causing a first output current to be generated in the first winding set in accordance with the first final current command
(
I
d
⁢
1
*
,
I
q
⁢
1
*
)
;
and
command, based on the second final current command
(
I
d
⁢
2
*
,
I
q
⁢
2
*
)
,
the second inverter to apply the second output voltage to the second winding set and thereby causing a second output current to be generated in the second winding set in accordance with the second final current command
(
I
d
⁢
2
*
,
I
q
⁢
2
*
)
.

101 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/088,428Filed 24 Mar 2025
Published: 1 Oct 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02P 25/022
Characterised by the kind of motor: synchronous motors
H02P 21/22
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation: current control, e.g. using…
H02P 25/22
Characterised by the circuit arrangement or by the kind of wiring: multiple windings; Windings for more than three phases
H02P 27/06
Using variable-frequency supply voltage, e.g. inverter or converter supply voltage: using DC to AC converters or inverters