High-power three-phase brushless direct-current motor control module and packaging of control module

A brushless DC motor, high-power technology, applied in the direction of a single motor speed/torque control, circuit device, emergency protection circuit device, etc., can solve the problems of heavy weight, short service life, large volume, etc., and achieve simple and flexible use. , compact and powerful effects

Inactive Publication Date: 2012-07-18
BEIJING AEROSPACE WANFANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the overall development of China's motor industry has been rapid in recent years, and product quality has been continuously improved, motors still have defects in terms of service life, reliability, material consumption, noise and vibration reduction, etc.
[0033] First of all, the integration level of the motor control system is not high, there are very few integrated modules, the control method adopted is relatively simple, and there are even problems in system heat dissipation
This situation has caused a series of problems in motor control products such as large volume, heavy weight, and low efficiency.
[0034] Secondly, there are very few standardized and serialized product types of motor control system manufacturers, and they are rarely able to provide comprehensive motor control solutions.
Its motor control system is not standardized in many aspects such as circuit design, control method adopted, production quality control, reliability test, etc., resulting in large fluctuations in product quality, low working stability in harsh environments, and short service life
[0035] The above reasons have caused the overall low level of the motor control system, which has led to the fact that my country's energy-saving motors cannot give full play to their high-efficiency and energy-saving features, and their actual efficiency can only reach about 85%. This also has a certain impact on the technological progress of electric products. resistance

Method used

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  • High-power three-phase brushless direct-current motor control module and packaging of control module
  • High-power three-phase brushless direct-current motor control module and packaging of control module
  • High-power three-phase brushless direct-current motor control module and packaging of control module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1: Voltage Control Mode

[0067] Figure 4 It is a typical voltage (speed) control wiring diagram. A voltage command proportional to the required speed is input to pin 4, this signal can be adjusted by rheostat R3. The speed feedback signal is obtained by filtering the output signal of Tach-out (pin 15) through the low-pass filter circuit R1 and C1. An internal fault-tolerant amplifier compensates for small signals in the speed control loop. The output of the fault-tolerant amplifier is connected to the PWM comparator. Because the motor speed is directly proportional to the average phase voltage, the speed control is actually controlled by the pulse width ratio. If open-loop speed control is used, pin 2 should be shorted with pin 8.

[0068] The loop-by-loop current limit function is implemented by connecting pins 25, 26, 12, and 13. The overcurrent protection limit is set by overcurrent reference pin 9. This reference is internally set to 1.15V, but c...

Embodiment 2

[0069] Embodiment 2: Current Control Mode

[0070] Figure 5 It is a typical current (torque) control connection diagram. A voltage command proportional to the required current is input to pin 4, and this signal can be adjusted by rheostat R3. The current feedback signal (Pin 11) is obtained through an internal current sensor and amplifier. The output of the internal fault-tolerant amplifier is connected to the PWM comparator. Because the torque is directly proportional to the average phase current, the torque control is actually controlled by the pulse width ratio.

[0071] The set value of the overcurrent protection reference pin 9 should be slightly higher than the maximum control current, which can ensure that the loop-by-loop current limit function of the module can still function when there is a large signal disturbance that causes the fault-tolerant amplifier to saturate.

Embodiment 3

[0072] Embodiment 3: DC bus filtering

[0073] In order to reduce the influence of parasitic inductance in the circuit during operation, the module motor connection circuit should be in accordance with Figure 6 connect. Capacitors C1, C2 and C3 can be ceramic capacitors from 0.1uF to 0.5uF. The electrolytic capacitor C4 is connected to the DC bus, and the capacitance of C4 is calculated according to the ratio of 10uF / A.

[0074] Below, a specific embodiment of a motor control module with a current of 20A and a voltage of 600V is given in combination with the above-mentioned embodiments:

[0075] 1. Setting conditions:

[0076] 1. PWM peak value 7.5V (5±2.5V).

[0077] 2. The fault-tolerant amplifier output (pin 8) is internally connected to the PWM comparator.

[0078] 3. Depending on the motor resistance and the power supply voltage, the output of the fault-tolerant amplifier should be less than 7.5V under normal operating conditions.

[0079] 4. The output of the faul...

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PUM

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Abstract

The invention provides a three-phase brushless direct-current motor integrated circuit module integrating power, driving and control into a whole, which is used for the speed or torque control of fans, water pumps, cranes, medical devices, electric automobiles and various large, medium and small brushless direct-current motors. The three-phase brushless direct-current motor integrated circuit module comprises a logic control circuit, a power element driving circuit, power elements and an over-temperature, over-current and overvoltage protection circuit. The invention also provides a packaging method of the module, comprising a metal printed circuit board, power elements, PCBs (Printed Circuit Boards), power output pins, control pins, a plastic shell and pressing rings. The packaging method is characterized in that the metal printed circuit board is a base plate of the whole module, and the power elements are welded on the metal base plate by soldering tins and connected with the control and drive PCBs. The power output pins and the control pins are respectively welded on the PCBs by the soldering tins and penetrate through the plastic shell to form external pins of the module, and the plastic shell is pressed into the metal printed circuit base plate through the tight fit by the pressing rings for being fixed. The all pins of the module are sealed together with the plastic shell through packaging resin.

Description

technical field [0001] The invention relates to the control field of DC brushless motors. Background technique [0002] Electric motors (hereinafter referred to as motors) are the main equipment that converts electrical energy into mechanical energy, and more than 80% of the world's electrical energy-mechanical energy conversion is completed by motors. As the power source of various equipment such as fans, water pumps, compressors, and machine tools, motors are used in almost all modern industrial fields, including aerospace, military, automobiles (especially electric vehicles), metallurgy, water conservancy, petrochemical, mining, and power plants. , steel mills and other industries. [0003] An effective way to improve motor efficiency is to use high-efficiency energy-saving motors and motor control systems. At present, the motors widely used in the world mainly include DC motors (DCMotor-DCM for short), induction motors (InductionMotor-IM for short), permanent magnet mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02H7/085H02H7/09H02H5/04
Inventor 刘立东
Owner BEIJING AEROSPACE WANFANG TECH
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