Inverter drives the motor

A technology for driving motors and inverters. It is applied in the direction of AC motor control, connection with control/drive circuits, and electric components. It can solve the problem of coil voltage becoming larger, and achieve the purpose of reducing voltage concentration, improving insulation, and reducing heat generation. Effect

Inactive Publication Date: 2017-07-11
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as shown in Figure 2(b), when the voltage rise time is small, the ground voltage Vs and Ve of the winding start point and the winding stop point rise sharply, and the coil voltage Vc becomes larger

Method used

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  • Inverter drives the motor
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Experimental program
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Embodiment

[0051] First, refer to Figure 4A general inverter-driven motor system to which the present invention is applied will be described. The inverter-driven motor system includes a motor 35 , a converter circuit 30 , an inverter circuit 32 , and a cable 9 connecting the motor 35 and the inverter circuit 32 , and is a mechanism for generating rotational torque of the motor 35 .

[0052] In addition, when simply referred to as an inverter in the present invention, it refers to a converter circuit 30 that converts an AC voltage into a DC voltage, a smoothing capacitor 31 that stabilizes the DC voltage, and a switching element 33 that switches the DC voltage to convert it into a rectangular inverter circuit. The circuit part of the inverter circuit 32 (inverter) that waves the AC voltage. Further, as the switching element 33 , FET (Field Effect Transistor), IGBT (Insulated Gate Bipolar Transistor), MOS-FET (Metal-Oxide-Semiconductor Field-Effect Transistor), or the like is used. In a...

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Abstract

The present invention provides an inverter-driven motor capable of reducing the voltage applied to a first coil on the power supply line side of the motor. In an inverter-driven motor including an inverter and a motor driven by the inverter, the inverter and the motor are connected by a terminal box, and the terminal box contains: connecting cables on the inverter side and lead wires on the motor side a terminal plate; a ground plate provided on the bottom surface of the terminal box; and a capacitor connected in series between the terminal plate and the ground plate.

Description

technical field [0001] The present invention relates to an inverter-driven motor that responds to sudden inverter surges. Background technique [0002] In recent years, variable speed operation of a motor using an inverter device has become popular from the viewpoint of energy saving. Currently, the most popular inverter device is a Si (IGBT) inverter, but it is expected that the number of inverters using SiC with a shorter voltage rise time and low loss will increase in the future. Specific examples of inverters using SiC include hybrid SiC (IGBT+SiCdiode) inverters using SiC only for diodes, and full SiC (MOS-FET+SiCdiode) using SiC for both diodes and switching elements. Inverter motor drives. [0003] On the other hand, when the motor is driven using the inverter device, the following phenomenon may cause insulation deterioration inside the motor. For example, regarding the stator winding of a motor, each phase winding consists of a plurality of series coils, but if t...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02K5/22H02P27/06
CPCH02K5/225H02K11/26H02K11/33H02P27/06
Inventor神谷昭范牧晃司尾畑功治开发庆一郎关根昭裕高桥秀一
OwnerHITACHI IND EQUIP SYST CO LTD