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Power regeneration converter and motor control device

A technology of power regeneration and control device, which is applied in the direction of motor control, motor generator control, AC motor control, etc., and can solve problems such as adverse effects of power regeneration converters

Active Publication Date: 2019-04-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, when each motor operates unexpectedly and the total value of continuous rated output of all motors or the total value of maximum output of all motors exceeds the allowable output power capacity of the power regenerative converter (hereinafter referred to as "overload state") ), there may be adverse effects on the power regenerative converter

Method used

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  • Power regeneration converter and motor control device
  • Power regeneration converter and motor control device
  • Power regeneration converter and motor control device

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Experimental program
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Effect test

Embodiment approach 1

[0087] First, the configuration of the motor control device according to Embodiment 1 will be described. figure 1It is a block diagram showing the configuration of the motor control device according to the first embodiment. The motor control device according to Embodiment 1 is, for example, figure 1 As shown, it is composed of the following parts: a motor drive device 4, which controls the variable speed of the motor 5; and a power regeneration converter 1, which is arranged in Between the input power supply 3 and the motor drive unit 4 that is a three-phase AC power supply, DC power can be supplied to the motor drive unit 4 and regenerative power generated when the motor decelerates can be returned to the input power supply 3 . The motor drive device 4 receives the supply of DC power from the power regenerative converter 1 and controls the motor 5 with variable speed.

[0088] The power regenerative converter 1 is constituted by the following parts: a smoothing capacitor 21...

Embodiment approach 2

[0237] Figure 15 It is a block diagram showing a motor control device including the power regeneration converter according to the second embodiment. In addition, in Figure 15 in, right with figure 1 The same or equivalent structural elements as those related to the illustrated first embodiment are denoted by the same reference numerals. Here, the description will focus on the part related to Embodiment 2. FIG. exist Figure 15 In the power regenerative converter according to Embodiment 2, the figure 1 In the illustrated configuration, an overload detection unit 28A is provided instead of the overload detection unit 28 .

[0238] The overload detection unit 28A will be described. The overload detection unit 28A has a function of determining an overload state in a steady state, and this determination function is configured based on the thermal cycle life of the power module 22 .

[0239] Figure 16 It is a block diagram showing a configuration example of the overload d...

Embodiment approach 3

[0316] Figure 19 It is a block diagram showing the configuration of the motor control device according to Embodiment 3. exist Figure 19 In pair with figure 1 (Embodiment 1) or Figure 15 The same or equivalent structural elements shown in (Embodiment 2) are denoted by the same reference numerals. Figure 19 With figure 1 or Figure 15 The same structure, but the illustration of the PN bus voltage detection part 23, the power phase detection part 24, the base drive signal generation part 26 and the regeneration control part 27 is omitted. Part 4A.

[0317] The motor control unit 4A has a function of supplying an arbitrary AC power to the motor 5 and controlling the motor 5 with a variable speed. The output of overload detection unit 28 in power regenerative converter 1 is configured to be input to motor control unit 4A via communication path 37 . In addition, in Figure 19 Although the overload detection unit 28 described in Embodiment 1, that is, the overload detect...

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Abstract

It has: a power module (22), which is composed of a rectifying element (D1-D6) and a regeneration switching element (S1-S6); a smoothing capacitor (21), which is connected to a DC power supply terminal (P, N) The DC power during the DC conversion operation is stored; the bus current detection part (25) detects the bus current flowing between the DC power supply terminal and the smoothing capacitor (21); the power phase detection part (24) detects the input power The phase of (3) is detected; the base drive signal generation part (26), which is based on the power phase detected by the power phase detection part (24), generates a base drive signal for on-off control of the switching element for regeneration; a regeneration control unit (27), which performs start processing / stop processing of a power regeneration operation based on the detection result of the bus current detection unit (25) and the base drive signal; and an overload detection unit (28), which detects Based on the detection result of the unit (25), the overload of the power regeneration converter (1) is detected.

Description

technical field [0001] The present invention relates to a power regenerative converter used in industrial machines such as machine tools, manufacturing machines, and robots, and a motor control device having the power regenerative converter. Background technique [0002] Generally, a motor consumes electric power during acceleration, and since it is necessary to reduce induced electromotive force generated during rotation of the motor during deceleration, the motor operates as a generator. In addition, for the convenience of the following description, the acceleration action of the electric motor is called "motor power running" or simply "power running", and the deceleration action of the electric motor is called "motor regeneration" or "regeneration" for short. [0003] In industrial machines such as machine tools, manufacturing machines, and robots, a motor is mounted on a drive shaft (hereinafter, this structure is referred to as a "shaft structure"), and the drive shaft ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06
CPCH02P27/06H02K47/04H02P9/107H02P29/027H02P2201/03H02P29/032H02P11/06H02M7/219H02M7/217H02M5/4585H02M1/0022H02M1/327
Inventor 林良知堤下洋治原川雅哉野尻祐二
Owner MITSUBISHI ELECTRIC CORP