MOTOR DRIVE APPARATUS AND POWER STEERING APPARATUS USING THE SAME

• US 20110156623A1
• Filed: 12/23/2010
• Published: 06/30/2011
• Est. Priority Date: 12/25/2009
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Mukai, Yasuhiko, Nakamura, Kouichi, Uryu, Nobuhiko
• Application Number:
  US12/977,580
• Publication Number:
  US 20110156623A1
• Time in Patent Office: Days
• US Class Current: 318/400.02
• CPC Class Codes: H02P 21/06 Rotor flux based control involving the use of rotor position or rotor speed sensors
• CPC Class Codes: H02P 5/74 controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence

Abstract

In a motor drive apparatus having two power supply systems for a motor, output phase currents supplied from inverters and detected by current sensors are added. Sums of the phase currents are fed back to a 3-2 phase conversion section and converted into a d-axis current and a q-axis current. A 2-3 phase conversion section outputs the same three-phase voltage command values to the inverters. Thus, the 3-2 phase conversion section and the 2-3 phase conversion section are both reduced to 1 in number, which is less than 2 of the inverters.

Claims

1. A motor drive apparatus for driving a three-phase AC motor by DC power of a DC power source, the motor drive apparatus comprising:

a plurality of inverters for converting the DC power of the DC power source into AC power and supplying the AC power to the three-phase AC motor;

a phase current detection section configured to detect three-phase currents supplied from the plurality of inverters to the three-phase AC motor;

a 3-2 phase conversion section configured to convert phase current detection values of each phase detected by the phase current detection section into a d-axis current and a q-axis current;

a current control calculation section configured to generate representative two-phase voltage command values based on detection values of the d-axis current and the q-axis current outputted from the 3-2 phase current conversion section and command values of the d-axis current and the q-axis current; and

a 2-3 phase conversion section configured to generate three-phase voltage command values from the representative two-phase voltage command values,

wherein numbers of the 3-2 phase conversion section and the 2-3 phase conversion section are less than that of the inverters.

2. The motor drive apparatus according to claim 1, wherein:

the 3-2 phase conversion section is configured to convert a sum of a plurality of phase current detection values of the plurality of inverters.

3. The motor drive apparatus according to claim 1, wherein:

the 2-3 phase conversion section is configured to apply the three-phase voltage command values to the plurality of inverters.

4. The motor drive apparatus according to claim 4, wherein:

the three-phase AC motor is provided in an electric power steering apparatus.