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multi-axis drive

A technology of a driving device and a switching device, which is applied to the deceleration device of a DC motor, a conversion device of output power, and the control of an AC motor, etc., can solve the problems of high cost, complexity, and inability to realize the miniaturization of the device.

Inactive Publication Date: 2017-04-12
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, according to the technology disclosed in Patent Document 2, since an inverter control circuit and a charge-discharge chopper control circuit are provided in a multi-axis drive device, a plurality of switching switches depending on electric signals are required, so the miniaturization of the device cannot be realized. Tendency to be costly and complex
[0019] In addition, it is necessary to install a power storage device for power assist, and the size of the power storage device for power assist cannot be reduced in size.
[0020] In addition, in order to generate commands internally without requiring commands from the upper-level controller, store regenerative power in the power storage device for power assistance, charge it to the bus voltage smoothing capacitor, and drive the motor The power assist control used requires the preparation of a unit for collecting power information in the drive device, or an external current sensor for measuring the power of the motor, which leads to the complexity and high cost of the multi-axis drive device.

Method used

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Embodiment approach 1

[0035] figure 1 It is a block diagram showing the configuration of the multi-axis drive device according to Embodiment 1 of the present invention. In the first embodiment and the five embodiments described later, an application example to a multi-axis drive device having a structure capable of driving two motors is shown for easy understanding.

[0036] First, for ease of understanding, refer to figure 1 , a multi-axis driving device having a structure capable of driving two motors will be briefly described. That is, in figure 1 Among them, a multi-axis driving device having a structure capable of driving two motors generally includes: a converter circuit 20 ; inverter circuits 21 and 22 ; bus voltage smoothing capacitors 23 and 24 ; and a control unit 25 .

[0037] The converter circuit 20 is a full-wave rectification circuit composed of a diode bridge, and converts a commercial AC power supply 26 into a DC power supply. The inverter circuits 21 and 22 are arranged in par...

Embodiment approach 2

[0049] figure 2 It is a block diagram showing the configuration of the multi-axis drive device according to Embodiment 2 of the present invention. In addition, in figure 2 in, right with figure 1 The same or equivalent structural elements shown in (Embodiment 1) are denoted by the same reference numerals. Here, the description will focus on the part related to the second embodiment.

[0050] exist figure 2 In the multi-axis driving device 1b according to the second embodiment, in figure 1 The specific configuration content of the control unit 25 is shown in addition to the configuration shown in (Embodiment 1). Other structures of the multi-axis driving device 1b and figure 1 The structure of the multi-axis drive device 1a is the same.

[0051] That is, the control unit 25 is provided with a motor control command generation unit 4 , an electric power assist command generation unit 5 , and a parameter 6 for each inverter circuit. exist figure 2 In , since there are...

Embodiment approach 3

[0057] image 3 It is a block diagram showing the configuration of the multi-axis drive device according to Embodiment 3 of the present invention. In addition, in image 3 in, right with figure 2 The same or equivalent structural elements shown in (Embodiment 2) are denoted by the same reference numerals. Here, the description will focus on the parts related to Embodiment 3. FIG.

[0058] exist image 3 Among them, in the multi-axis drive device 1c according to the third embodiment, in figure 2 In the configuration shown in (Embodiment 2), the output terminal of the inverter circuit 22 is switchably connected to one end of the reactor 2 and the motor 8 via the switching device 7 that does not depend on electric signals.

[0059] The switching device 7 that does not depend on electric signals is a terminal block or a connector, and has a structure that one end of the reactor 2 and the motor 8 are switched and connected to the switching device 7 by manual work, so that th...

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Abstract

A part of bus-voltage smoothing capacitors within a multiaxial driving apparatus is usable as a power-assisting electric storage device for storing regenerative power. This makes it unnecessary to additionally provide a power-assisting electric storage device, which has been required in order to obtain a power-assist function. Therefore, the multiaxial driving apparatus can be obtained, which is equipped with the power-assist function of achieving effective use of regenerative power easily at low cost without resulting in an increase in complexity and high cost.

Description

technical field [0001] The present invention relates to a multi-axis drive device for separately driving a plurality of electric motors by arranging a plurality of inverter circuits in parallel at the output end of one converter circuit. shaft drive. Background technique [0002] A motor drive device for driving and controlling a motor includes: a converter circuit that converts commercial AC power to DC power; a bus voltage smoothing capacitor that smoothes the output DC voltage of the converter circuit to generate a stable bus voltage; and an inverter circuit for generating a drive AC power supply of an arbitrary frequency and voltage to be supplied to the motor by switching on and off the bus voltage generated by the bus voltage smoothing capacitor. [0003] In addition, the inverter circuit has a structure in which a predetermined number of semiconductor switching elements such as IGBTs connected in antiparallel to the freewheeling diodes are bridge-connected in series ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P5/74H02M7/797H02P3/14
CPCH02M7/797H02P3/14H02P5/74H02P27/04
Inventor 今孝公
Owner MITSUBISHI ELECTRIC CORP
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