Motor drive device and motor drive system

Patent metadata

Field	Value
Publication number	US-9602037-B2
Application number	US-201314433788-A
Country	US
Kind code	B2
Filing date	Nov 15, 2013
Priority date	Nov 27, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A motor drive device and motor drive system according to the present invention comprise: a power source terminal; a charging and discharging unit connected in series with the power source terminal; connection terminals to be connected to each of primary and secondary excitation coils for an anti-symmetric two phase motor; and a drive control unit which has a plurality of switching elements and respectively forms first and second paths by turning these switching elements on and off. The first path is used for independently supplying power to the respective primary and secondary excitation coils from the power source terminal via the connection terminals, and the second path is used for independent regeneration of each residual energy remaining in the primary and secondary excitation coils from the respective primary and secondary excitation coils into the charging and discharging unit via the connection terminals.

First claim

The invention claimed is:

1. A motor drive device comprising:
a power source terminal for connecting to a power source;
a charging and discharging unit that performs charging and discharging, connected in series with the power source terminal;
connecting terminals to be connected to each of primary and secondary excitation coils of an anti-symmetric two phase motor; and
a drive control unit that has a plurality of switching elements, and that forms a first path for independently supplying power to each of the primary and secondary excitation coils from the power source terminal via the connecting terminals, by turning the plurality of switching elements on and off, and further forms a second path for independent regeneration of each residual energy remaining in the primary and secondary excitation coils from the respective primary and secondary excitation coils into the charging and discharging unit via the connecting terminals by turning these switching elements on and off, wherein
the primary and secondary excitation coils have a phase period corresponding to cyclic change of inductance due to rotation of a rotor of the anti-symmetric two phase motor,
the phase period of the primary excitation coil is shifted in phase from the phase period of the secondary excitation coil by 180 degrees,
the first path includes a path of a first form for supplying electricity from the power source terminal to the primary excitation coil via the connecting terminals, and a path of a second form differing from the path of the first form, for supplying electricity from the power source terminal to the secondary excitation coil via the connecting terminals,
the second path includes a path of a third form for regenerating residual energy remaining at the primary excitation coil from the primary excitation coil to the charging and discharging unit via the connecting terminals, and a path of a fourth form different from the path of the third form, for regenerating residual energy remaining at the second excitation coil from the secondary excitation coil to the charging and discharging unit via the connecting terminals, and
with a predetermined number 1 phase as a starting point in a case where inductance of the primary excitation coil is increasing, the drive control unit repeats, synchronously with the inductance cycle of the primary excitation coil, a first electricity supply mode where electricity is supplied to the primary excitation coil by the path of the first form, a first regeneration mode where residual energy remaining at the primary excitation coil is regenerated by the path of the third form, a second electricity supply mode where electricity is supplied to the secondary excitation coil by the path of the second form, and a second regeneration mode where residual energy remaining at the second excitation coil is regenerated by the path of the fourth form, in this order.

2. The motor drive device according to claim 1 ,
wherein the drive control unit further forms a third path for independently supplying electricity to each of the primary and secondary excitation coils from the charging and discharging unit via the connecting terminals, by turning the plurality of switching elements on and off while excitation is being performed on the first path, to raise the excitation voltage.

3. The motor drive device according to claim 1 ,
wherein the drive control unit forms the first path using a common switching element out of the plurality of switching elements, for independently supplying electricity to each of the primary and secondary excitation coils from the power source terminal via the connecting terminals.

4. The motor drive device according to claim 1 ,
wherein the drive control unit further includes a common rectifying element to form the second path, for independently regenerating residual energy, remaining at the primary and secondary excitation coils, from each of the primary and secondary excitation coils to the charging and discharging unit via the connecting terminals.

5. The motor drive device according to claim 1 ,
wherein the drive control unit further forms a fourth path for putting the primary and secondary excitation coils in a freewheeling state by turning the plurality of switching elements on and off, and further includes an individual rectifying element to form the fourth path, in order to put the primary and secondary excitation coils in a freewheeling state.

6. The motor drive device according to claim 1 , further comprising:
the power source, that is connected to the power source terminal and is a secondary battery that is charged and discharged;
wherein the drive control unit further forms a fifth path for independently regenerating residual energy remaining at the primary and secondary excitation coils, from each of the primary and secondary excitation coils to the power source via the connecting terminals, by turning the plurality of switching elements on and off, and further includes a common rectifying element and switching element to form the fifth path, for independently regenerating residual energy remaining at the primary and secondary excitation coils, from each of the primary and secondary excitation coils to the power source via the connecting terminals.

7. The motor drive device according to claim 1 ,
wherein the first path includes a path of a first form for supplying electricity from the power source terminal to the primary excitation coil via the connecting terminals, and a path of a second form differing from the path of the first form, for supplying electricity from the power source terminal to the secondary excitation coil via the connecting terminals,
wherein the fifth path includes a path of a ninth form for regenerating residual energy remaining at the primary excitation coil from the primary excitation coil to the power source via the connecting terminals, and a path of a tenth form different from the path of the ninth form, for regenerating residual energy remaining at the second excitation coil from the secondary excitation coil to the power source via the connecting terminals,
and wherein, with a predetermined number 2 phase as a starting point before inductance of the primary excitation coil begins to decrease or immediately after decrease begins, the drive control unit repeats, synchronously with the inductance cycle of the primary excitation coil, a first electricity supply mode where electricity is supplied to the primary excitation coil by the path of the first form, a third regeneration mode where residual energy remaining at the primary excitation coil is regenerated by the path of the ninth form, a second electricity supply mode where electricity is supplied to the secondary excitation coil by the path of the second form, and a fourth regeneration mode where residual energy remaining at the second excitation coil is regenerated by the path of the tenth form, in this order.

8. The motor drive device according to claim 1 ,
wherein the first path includes a path of a first form for supplying electricity from the power source terminal to the primary excitation coil via the connecting terminals, and a path of a second form differing from the path of the first form, for supplying electricity from the power source terminal to the secondary excitation coil via the connecting terminals,
wherein the second path includes a path of a third form for regenerating residual energy remaining at the primary excitation coil from the primary excitation coil to the charging and discharging unit via the connecting terminals, and a path of a fourth form different from the path of the third form, for regenerating residual energy remaining at the second excitation coil from the secondary excitation coil to the charging and dis

Assignees

• Kobe Steel Ltd

Inventors

• Hamaguchi Masashi
• Nogi Toshihiro
• Inoue Kenichi

Classifications

• H02P25/092 Primary

  Converters specially adapted for controlling reluctance motors · CPC title

• H02P25/085 Primary

  Electricity · mapped topic