JP2003102189A - Ac servomotor drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC servomotor drive unit of superior reliability. SOLUTION: There is provided a dual redundant constitution using an AC servomotor 10, having a rotor 12 provided with a plurality of pairs of magnetic poles and a stator 11 provided with a pair of three-phase windings 11A and 11B wound on its circumference, each being separated by 60 deg. in terms of an electric angle; and one set of control units 2A and 2B supplying individually three-phase AC current to the three-phase windings 11A and 11B respectively. In this case, preferably, the phase difference between the three-phase AC currents outputted from the control units 2A and 2B respectively is made 60 deg. in terms of the electric angle, and also preferably, in normal operation, the pair of three-phase windings 11A and 11B are turned on, and the combined torque is generated in the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC servomotor drive device for an actuator used in the fields of aircraft and space.

[0002]

2. Description of the Related Art As an AC servo motor driving device used in an aircraft or the like, a permanent magnet type synchronous motor having a structure shown in the circuit diagram of FIG. 3, that is, an AC servo motor 1 and a control device 2 for controlling the same are adopted. Alternatively, as shown in the circuit diagram of FIG. 4, a dual redundant configuration is employed in which only two control devices 2 are used and each is connected to the AC servomotor 1 through the changeover switch 3.

First, a conventional AC servo motor drive device will be described with reference to FIG. The AC servomotor 1 includes a three-phase winding 11a of a stator 11, a rotor 12 having permanent magnet magnetic poles arranged at equal intervals in the circumferential direction (an example of a four-pole structure is shown in FIG. 3), and rotation of the rotor. It has a rotor angle detector 13 coupled to the shaft. The control device 2 performs on / off control of a switching power element (an example of an IGBT is shown in FIG. 3) connected to the DC power source 21 and a three-phase bridge circuit 22 composed of an antiparallel diode by a control pulse signal from the controller 23. Convert DC power into three-phase AC power,
A three-phase alternating current is supplied to the stator three-phase winding 11a. Rotational torque is generated in the rotor by the magnetic action acting between the rotor field and the rotating field created by the phase current flowing in each phase of the stator three-phase winding. In order to effectively obtain this rotational torque, the rotor angle detector 13 is used to determine the rotor angle (position).
The signal is fed back to the controller 23, and the CPU in the controller performs arithmetic processing so that the relative positional relationship of the phase current of the stator three-phase winding with respect to the magnetic pole position of the rotor is optimized.

Next, an AC servo motor drive device using a conventional AC servo motor and having a double redundant configuration for enhancing reliability will be described with reference to FIG. Same composition 2
One of the two control devices 2 supplies current to the stator three-phase winding of the AC servomotor 1 and the conventional A
The motor is operated according to the same operation principle as the C servo motor drive device. When the control device fails during motor operation, this is detected, and the control device in standby is automatically switched by the changeover switch 3 to continue the operation of the motor. Changeover switch 3
A contact relay is used for.

[0005]

However, in the AC servo motor drive device of the actuator in the aerospace field, the conventional method of continuing the operation performed by the operation of the contact relay is sufficient for ensuring the safety during the operation. Since there is no such reliability, higher reliability is required. The present invention has been made in view of this problem,
It is an object of the present invention to provide an AC servo motor drive device having extremely excellent reliability.

[0006]

DISCLOSURE OF THE INVENTION The present invention is based on the use of two sets of 3 on the circumference of the stator of an AC servomotor, separated by an electrical angle of 60 degrees.
Phase windings are wound, and two sets of control devices for individually supplying a three-phase alternating current to each of the three-phase windings are used so that they are always operated together. If you do this,
All the basic circuits except the rotating part of the motor have a double redundant configuration, and since no parts with difficulty in reliability such as contact relays are used, the reliability of the AC servo motor drive device is improved compared to the conventional one. It can be significantly increased.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an AC servo motor drive device of the present invention will be described below with reference to FIG. Figure 1
FIG. 3 is a circuit diagram of this AC servo motor drive device. The same components as those of the conventional example are designated by the same reference numerals as those in FIGS. 3 and 4. In FIG. 1, 10 is an AC servomotor, and the stator 11 is two sets of three-phase windings 11A.
And 11B. Each phase winding of 11A is Ua,
Expressed by Va and Wa, each phase winding of 11B is Ub, Vb, W
It is represented by b, and the mark indicates the winding start of the winding.
Further, Na and Nb in FIG. 1 are windings Ua and V for each phase, respectively.
The winding ends of a, Wa and Ub, Vb, Wb are shown, and these winding ends Na, Nb are connected to each other so that each phase winding is star-connected. Figure 2
[Fig. 4] is an arrangement configuration diagram of each phase winding of the stator three-phase windings 11A and 11B. The respective stator three-phase windings are wound on the circumference at an electrical angle of 60 degrees from each other. 2 indicates the winding start of each phase winding, Na and Nb indicate the winding end of each phase winding, and correspond to the circuit diagram of FIG. The rotor 12 and the rotor detector 13 have the same configurations as those of the conventional AC servo motor drive device (FIG. 3), and detailed description thereof will be omitted. Reference numerals 2A and 2B are control devices having the same configuration, and the basic configuration is the same as that of the conventional AC servo motor drive device (FIG. 3), and detailed description of the circuit is omitted.

From the control device 2A, the stator three-phase winding 1
A three-phase alternating current is supplied to each phase winding of 1A and from the control device 2B to each phase winding of the stator three-phase winding 11B. As a result, the gap between the stator and rotor will be 3
A rotating magnetic field is generated by the phase winding 11A and a rotating magnetic field by the three-phase winding 11B, and a rotating torque is generated in the rotor by the magnetic action acting between the combined rotating magnetic field and the rotor magnetic pole.

In order to effectively obtain this rotational torque, the rotor angle detector 13 feeds back the rotor angle (position) signal to the controller 23A of one of the control devices 2A, and the CPU in the controller 23A carries out the arithmetic processing to Control is performed via the switching power element bridge 22A so that the relative positional relationship of the phase current of the three-phase winding 11A of the stator with respect to the magnetic pole position of is optimized. On the other hand, the rotor angle (position) signal is also fed back to the controller 23B of the control device 2B, and the controller 23B
The CPU in B performs arithmetic processing, and controls through the switching power element bridge 22B so that the relative positional relationship of the phase current of the three-phase winding 11B of the stator with respect to the magnetic pole position of the rotor becomes optimum. By such control,
The phase difference between the three-phase alternating current supplied from the control device 2A to the three-phase winding 11A and the three alternating current supplied from the control device 2B to the three-phase winding 11B is 60 electrical degrees. This is because, as described above, the three-phase winding 11A and the three-phase winding 11B are wound around the circumference of the stator at an electrical angle of 60 degrees.

Since the rated output powers of the control device 2A and the control device 2B are those having a capacity commensurate with the rated output of the motor, when the motor is operating in the rated condition, each control device has its own output. It outputs half the rated power. If one control unit or the stator three-phase winding fails during the rated operation of the motor, and the rotating magnetic field formed by one three-phase winding disappears, the other control unit outputs the rated power. Is output and the rated operation of the motor is continued.

[0011]

Since the present invention has the above-mentioned structure, it has the following excellent effects. (1) The reliability of the AC servo motor drive device can be significantly improved because all the basic circuits except the rotating part of the motor have a double redundant configuration. (2) Since reliability-requiring parts such as a contact relay are unnecessary, reliability can be improved. (3) Since the output of each control device at the time of normal motor rated operation is half the rated operation, the control device can be used under a highly reliable use condition. Further, during normal operation, it has the ability to output the motor torque up to 200%. (4) Since the three-phase windings of the stator are wound so as to be spatially separated from each other, it is possible to mitigate the similar burning to the other three-phase windings when one of the three-phase windings burns out.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an AC servo motor driving device according to the present invention.

FIG. 2 is a layout configuration diagram of a stator winding of the AC servomotor according to the present invention.

FIG. 3 is a circuit diagram of a conventional AC servo motor drive device.

FIG. 4 is a circuit diagram of an AC servo motor drive device having a double redundant configuration using a conventional AC servo motor.

[Explanation of symbols]

10: AC servo motor 2A, 2B: Control device 11: Stator 11A, 11B: Stator three-phase winding 12: rotor 13: Rotor angle detector 21A, 21B: DC power supply 22A, 22B: Switching power element bridge 23A, 23B: Controller

Continued front page    (72) Inventor Hitoshi Oyori             2-2-1 Otemachi, Chiyoda-ku, Tokyo Stock             Ceremony Company IHI Aerospace             Within F-term (reference) 5H560 AA10 BB04 BB12 DA00 EB01                       EB07 GG04 RR10 SS02 TT15                       UA06 XA05

Claims (2)

[Claims] 1. An AC servomotor having a rotor having a plurality of pairs of magnetic poles and a stator having two sets of three-phase windings, each of which is wound around the circumference at an electrical angle of 60 degrees, and each of the three A dual redundant configuration is used by using two sets of control devices for individually supplying three-phase alternating current to each phase winding.
C servo motor drive device. 2. The phase difference between the three-phase alternating currents output from the respective control devices is set to an electrical angle of 60 degrees, and during normal operation, the two sets of three-phase windings are energized to generate a combined torque by them. The AC servomotor drive device according to claim 1, wherein the motor is generated.