US 9,312,800 B2Granted

Control techniques for an interior permanent magnet synchronous motor of an electrified vehicle

AssigneesFca US LLC, Kettering University

InventorsAhmad Arshan Khan, Young Joo Lee, Bing Cheng, Hua Bai, Fei Yang, Allan Taylor

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Abstract

A system and method for controlling an interior permanent magnet synchronous motor (IPMSM) are presented. In an exemplary implementation, phase current ripple estimation techniques are utilized for variable frequency switching pulse-width modulation control of the IPMSM. In one implementation, the method includes controlling a three-phase inverter based on an initial switching frequency to generate a three-phase alternating current (AC) voltage for the IPMSM. Transformed voltages are determined in a rotating reference frame based on the three-phase AC voltage in the stationary reference frame. Current ripples are determined in the rotating reference frame based on the transformed voltages. Phase current ripples are determined in the stationary reference frame based on the current ripples in the rotating reference frame. A modified switching frequency for the three-phase inverter is determined based on the initial switching frequency and the phase current ripples. The three-phase inverter is then controlled based on the modified switching frequency.

Claims19

Dependent claims

An electrified vehicle, comprising:

an interior permanent magnet synchronous motor (IPMSM) configured to generate drive torque in response to a three-phase AC voltage;
a power source configured to generate a direct current (DC) voltage;
a three-phase inverter configured to convert the DC voltage to the three-phase AC voltage for the IPMSM;
and
a controller comprising a memory configured to store a set of instructions and one or more processors configured to execute the set of instructions, which causes the controller to perform operations comprising:
control the three-phase inverter based on an initial switching frequency to generate the three-phase AC voltage;
determine transformed voltages in a rotating reference frame based on the three-phase AC voltage in a stationary reference frame;
determine voltage ripples in the rotating reference frame based on the transformed voltages;
determine current ripples in the rotating reference frame based on the voltage ripples;
determine phase current ripples in the stationary reference frame based on the current ripples in the rotating reference frame;
determine a modified switching frequency for the three-phase inverter based on the initial switching frequency and the phase current ripples;
and
perform variable switching frequency pulse-width modulation (VSFPWM) control of the three-phase inverter based on the modified switching frequency.

10 more elements

A method, comprising:

controlling, by a controller of an electrified vehicle, a three-phase inverter of the electrified vehicle based on an initial switching frequency to generate a three-phase alternating current (AC) voltage for an interior permanent magnet synchronous motor (IPMSM) of the electrified vehicle;
determining, at the controller, transformed voltages in a rotating reference frame based on the three-phase AC voltage in a stationary reference frame;
determining, at the controller, voltage ripples in the rotating reference frame based on the transformed voltages;
determining, at the controller, current ripples in the rotating reference frame based on the voltage ripples;
determining, at the controller, phase current ripples in the stationary reference frame based on the current ripples in the rotating reference frame;
determining, at the controller, a modified switching frequency for the three-phase inverter based on the initial switching frequency and the phase current ripples;
and
performing, by the controller, variable switching frequency pulse-width modulation (VSFPWM) control of the three-phase inverter based on the modified switching frequency.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/467,455Filed 25 Aug 2014
Published: US 2016/0056744 A125 Feb 2016
Granted: 12 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02P 27/085
With pulse width modulation: wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
H02P 23/04
Arrangements or methods for the control of AC motors characterised by a control method other than vector control: specially adapted for damping…
H02P 29/50
Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors: reduction of harmonics
H02P
Control or regulation of electric motors, electric generators or dynamo-electric converters