CN110631833A

CN110631833A - Magnetoelectric rotating speed generator

Info

Publication number: CN110631833A
Application number: CN201910845367.6A
Authority: CN
Inventors: 杨传雷; 李旸; 王银燕; 王贺春
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2019-12-31

Abstract

The invention aims to provide a magnetoelectric rotating speed generator which comprises a brushless direct current motor, a battery pack, a PID controller and a magnetic gear, wherein the battery pack is respectively connected with the brushless direct current motor and the PID controller, the power output end of the brushless direct current motor is coaxially connected with a first chain wheel, the magnetic gear is coaxially connected with a second chain wheel, the first chain wheel is connected with the second chain wheel through a transmission chain, the brushless direct current motor is arranged on a first fixed support, the central shaft of the magnetic gear is arranged on a second fixed support, a Hall sensor is arranged on the upper square of the magnetic gear, the Hall sensor is arranged on a fourth fixed support, and the magnetoelectric sensor is arranged on a third fixed support and positioned beside the magnetic gear. The speed signal received by the sensor is real and reliable in source, and inaccuracy of rotation speed signal simulation is overcome; the PID controller can realize the constant speed function of the motor through the signal feedback of the Hall sensor; simple structure, convenient operation, wide application range, high detection speed and high precision.

Description

Magnetoelectric rotating speed generator

Technical Field

The invention relates to a rotating speed detection system, in particular to a rotating speed detection system of an engine.

Background

Along with the increasing complexity of the structure and the control strategy of the engine electric control system, the research and development work difficulty and the experimental workload of the electric control system are greatly increased, and the cost is greatly improved. The V-type development mode has become the mainstream of the engine ECU (electronic control Unit) development process, wherein the hardware in the loop simulation needs to provide a rotation speed signal of the engine to verify the correctness of the software algorithm in order to match the development of the ECU software. In a commonly used mode at present, a rotation speed simulator generates and outputs a rotation speed (frequency) signal and a given current signal required by a site in a simulation mode to debug an electric control device (such as an electronic speed regulator and the like) under the condition that an engine is not started.

The existing rotating speed signal generators in the market are mostly replaced by standard sine waves, square waves or sawtooth waves (as shown in figure 1) generated by a circuit, and the signals have the characteristics of pure, stable and non-interference waveforms, periodicity, good repeatability, stable amplitude value and stable vibration phase. The disadvantage is that it is impossible to simulate the speed signal generated during the actual operation of the engine, the amplitude of which increases with increasing speed and is associated with significant noise (see fig. 2). In an engine control system, a truly effective signal simulation is a powerful support for the detection device. The accuracy of the control system for acquiring signals can be detected, and the anti-interference capability of the control system can be detected. This is not comparable with the standard waveform.

Disclosure of Invention

The invention aims to provide a magnetoelectric rotating speed generator which realizes a constant speed function through signal feedback and outputs an accurate and real rotating speed signal to an electric control device.

The purpose of the invention is realized as follows:

the invention discloses a magnetoelectric rotating speed generator, which is characterized in that: including brushless DC motor, the group battery, the PID controller, take magnetic gear, brushless DC motor and PID controller are connected respectively to the group battery, brushless DC motor's power take off end links to each other with first sprocket is coaxial, take magnetic gear and second sprocket to link to each other coaxially, first sprocket and second sprocket pass through the driving chain and link to each other, brushless DC motor installs on first fixed bolster, take magnetic gear's center pin to install on the second fixed bolster, take magnetic gear's the square hall sensor that sets up of going up, hall sensor installs on the fourth fixed bolster, magneto electric sensor installs on the third fixed bolster and is located to take magnetic gear by.

The present invention may further comprise:

1. the first chain wheel and the second chain wheel have equal tooth number and the transmission ratio is 1: 1.

2. The third fixed support is provided with a rotating axial displacement device, and the magnetoelectric sensor is arranged on the rotating axial displacement device.

3. The third fixing support is adjustable in height, so that the center of the magnetoelectric sensor is positioned on a horizontal line at the center of a circle of the magnetic gear.

The invention has the advantages that:

1. the speed signal received by the sensor has a real and reliable source, and the inaccuracy of the simulation of the rotating speed signal is overcome;

2. the PID controller can realize the constant speed function of the motor through the signal feedback of the Hall sensor;

3. simple structure, convenient operation, wide application range, high detection speed and high precision.

Drawings

FIG. 1 is a standard waveform signal of a conventional tachometer signal generator;

FIG. 2 is a sinusoidal signal accompanied by clutter;

fig. 3 is a schematic structural diagram of the present invention.

Detailed Description

The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:

referring to fig. 1-3, the magnetoelectric speed generator of the present invention includes a brushless dc motor 3, a magnetic gear 11, a magnetoelectric sensor 10, a hall sensor 12, a rotating axial displacement device 9, a PID controller 2, a battery pack 1, a sprocket i 4, a sprocket ii 6, a fixed bracket, etc. The battery pack 1 is used for conveying electric energy to the PID controller 2 and the brushless direct current motor 3 through a circuit, the PID controller 2 is connected with the brushless direct current motor 3 through a circuit, the power output end of the brushless direct current motor 3 is coaxially connected with a chain wheel I4, a magnetic gear 11 is coaxially connected with a chain wheel II 6, the chain wheel I4 is connected with the chain wheel II 6 through a transmission chain, the number of teeth of the two chain wheels is equal, the transmission ratio is 1:1, the motor is installed on a fixed support I5, and a central shaft fixed by the magnetic gear is installed on a fixed support II 7. The Hall sensor 12 is positioned right above the magnetic gear 11, is arranged on the fixed support IV 17, and the output end of the Hall sensor is connected with the PID controller 2 through a circuit; the magnetoelectric sensor 10 is arranged on a rotating shaft displacement device 9 fixed on a fixed support III 8, the output end of the magnetoelectric sensor is connected with other electric control devices through a circuit, and the height of the fixed support III needs to be adjusted to ensure that the center of the magnetoelectric sensor and the circle center of a magnetic gear are on the same horizontal line.

The Hall sensor is used for converting the received rotating speed electrical signal into a pulse signal and feeding back the pulse signal to the PID controller.

The magnetoelectric sensor is used for outputting received voltage signals to a power supply device (such as an electronic speed regulator and the like), and signal output ends a and b of the magnetoelectric sensor are connected with signal input ends of other electric control equipment.

The function of fine adjustment of the distance between the magnetoelectric sensor and the magnetic gear can be realized by rotating the axial displacement device through the screw rod.

The solid arrows in fig. 3 indicate the direction of electrical signal transmission, and the open arrows indicate the direction of electrical energy transmission.

In fig. 3, the ends a and b refer to signal input ends of other electric control equipment.

The invention utilizes the brushless DC motor 3 to drive the magnetic gear 11 to rotate through the transmission chain, and provides a real and reliable rotating speed signal for the sensor. On one hand, the Hall sensor 12 feeds back the obtained speed signal to the PID controller 2 so as to realize the control of the rotating speed of the brushless direct current motor 3, thereby ensuring the stability and accuracy of the rotating speed output; on the other hand, the magnetoelectric sensor 10 converts the rotation speed signal of the magnetic gear 11 into an electrical signal and outputs the electrical signal for other electric control equipment (such as an electronic governor, etc.), the amplitude of the output signal is proportional to the rotation speed of the magnetic gear 11, and the frequency of the signal is represented by the rotation speed of the magnetic gear 11. The magnitude of the magnetoelectric sensor input signal is adjusted by finely adjusting the distance between the magnetoelectric sensor 10 and the magnetic-carrying gear 11 by means of the screw-based axial displacement device 9.

Claims

1. Magnetoelectric revolution generator, characterized by: including brushless DC motor, the group battery, the PID controller, take magnetic gear, brushless DC motor and PID controller are connected respectively to the group battery, brushless DC motor's power take off end links to each other with first sprocket is coaxial, take magnetic gear and second sprocket to link to each other coaxially, first sprocket and second sprocket pass through the driving chain and link to each other, brushless DC motor installs on first fixed bolster, take magnetic gear's center pin to install on the second fixed bolster, take magnetic gear's the square hall sensor that sets up of going up, hall sensor installs on the fourth fixed bolster, magneto electric sensor installs on the third fixed bolster and is located to take magnetic gear by.

2. The magnetoelectric speed generator according to claim 1, wherein: the first chain wheel and the second chain wheel have equal tooth number and the transmission ratio is 1: 1.

3. The magnetoelectric revolution speed generator according to claim 1 or 2, wherein: the third fixed support is provided with a rotating axial displacement device, and the magnetoelectric sensor is arranged on the rotating axial displacement device.

4. The magnetoelectric revolution speed generator according to claim 1 or 2, wherein: the third fixing support is adjustable in height, so that the center of the magnetoelectric sensor is positioned on a horizontal line at the center of a circle of the magnetic gear.

5. The magnetoelectric rotational speed generator according to claim 3, wherein: the third fixing support is adjustable in height, so that the center of the magnetoelectric sensor is positioned on a horizontal line at the center of a circle of the magnetic gear.