CN212250530U - Industrial fan of outer rotor permanent magnet motor - Google Patents

Abstract

The utility model discloses an external rotor permanent-magnet machine industrial fan, including installation pole, blade subassembly, motor and control system, control system includes virtual encoder module and motor drive module, and motor drive module's input and output and motor output are connected respectively to virtual encoder module, and the motor is permanent-magnet machine. The utility model discloses a control system adopts virtual encoder module to realize the function of hardware encoder, obtains the control to the fan motor of electric motor rotor magnetic pole angle realization through the vector parameter calculation of detecting motor feedback voltage, electric current, and need not to install the hardware encoder on the motor; through changing alternating current motor drive into permanent magnet machine drive, permanent magnet machine has efficient, specific power great, power factor is high, the reliability is high and the advantage of being convenient for maintain, still has advantages such as ultra-thin, big moment of torsion of low-speed and good heat dissipation.

Description

Industrial fan of outer rotor permanent magnet motor

Technical Field

The utility model relates to an industrial fan field, especially an outer rotor permanent magnet machine industrial fan

Background

An industrial fan is a device which is driven by electricity to generate airflow and is electrified and then rotated into natural wind to achieve the effect of cooling.

The fan motor control system in the prior art is divided into an open-loop scheme and a closed-loop scheme, wherein the open-loop scheme is gradually eliminated in industrial occasions under the trend of energy conservation and emission reduction due to low efficiency and high energy consumption, and is not discussed below; the closed-loop scheme, generally need install the hardware encoder on the motor and control, the amount of wind of fan realizes through control motor rotational speed, and its theory of operation is: the control system obtains a feedback electric signal generated by the hardware encoder when the fan motor rotates, and the calculated feedback electric signal is converted into different mechanical forces for rotating the fan blades by rotating the driving motor at different rotating speeds, so that the control of the air volume of the fan is realized.

The control accuracy of the existing fan control system completely depends on the electric signal feedback of a hardware encoder to the control system. However, the cost of the encoder is high, which results in high cost of generation and maintenance of the fan control system in the prior art, and the external hardware encoder mode is easy to cause motor stall control due to the fact that the hardware encoder does not correspond to the magnetic pole angle of the motor.

Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cost is lower, it is convenient to maintain, and need not to install the outer rotor permanent magnet motor industrial fan of hardware encoder on the motor.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides an external rotor permanent-magnet machine industrial fan, is in including installing installation pole, the setting on the steel constructs the fixed plate the blade subassembly in the installation pole outside, set up the motor in the installation pole outside and with the control system that the motor electricity is connected, the motor through a connecting piece with the blade subassembly is connected, and fixed the setting is in the bottom of blade subassembly, control system includes virtual encoder module and motor drive module, virtual encoder module connects respectively motor drive module's input and output and the motor output end, the motor is permanent-magnet machine.

As a preferred mode of the utility model, the motor is including leading to lid, frame, center pin, bearing group, stator, external rotor and stifle, the frame with the installation pole is connected, the center pin passes through bearing group connects on the frame, the stator is fixed the outside of frame, the stator includes stator core and stator winding, stator winding sets up on the stator core, the external rotor sets up stator winding's the outside, it is in to lead to the lid setting the top of frame, the stifle sets up the bottom of frame.

As an optimized mode of the utility model, be provided with the magnet steel on the interior peripheral surface of external rotor and separate the magnetic stripe.

As an optimized mode of the utility model, the lead to cover with the stifled cover all is provided with the confession the bearing space that the bearing group placed.

As an optimized mode of the utility model, the edge of leading to the lid with the edge of stifle all is provided with the confession the step that the external rotor was placed.

As an optimized mode of the utility model, the stator winding is in the inside equidistant distribution of annular that is of motor, just the stator winding passes through the screw fixation in the inside of motor.

As a preferable mode of the present invention, the stator winding is a concentrated winding.

Through adopting aforementioned design, the beneficial effects of the utility model are that: the utility model discloses a control system adopts virtual encoder module to realize the function of hardware encoder, obtains the control to the fan motor of electric motor rotor magnetic pole angle realization through the vector parameter calculation of detecting motor feedback voltage, electric current, and need not to install the hardware encoder on the motor; through changing alternating current motor drive into permanent magnet machine drive, permanent magnet machine has efficient, specific power great, power factor is high, the reliability is high and the advantage of being convenient for maintain, still has advantages such as ultra-thin, big moment of torsion of low-speed and good heat dissipation.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the control system of the present invention;

in the figure: the mounting rod 1, the blade assembly 2, the motor 3, the through cover 31, the base 32, the central shaft 33, the first bearing 341, the second bearing 342, the stator winding 35, the outer rotor 36, the blank cover 37, the step 38, the control system 4, the virtual encoder module 41, the motor driving module 42 and the connecting piece 5.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 2:

the utility model provides an outer rotor permanent-magnet machine industrial fan, is including installing installation pole 1 on the steel structure fixed plate, setting at the blade subassembly 2 in the installation pole 1 outside, setting at the motor 3 in the installation pole 1 outside and the control system 4 of being connected with motor 3 electricity, and motor 3 passes through connecting piece 5 and 2 axial connections of blade subassembly, and the fixed bottom that sets up at blade subassembly 2 of motor 3.

The control system 4 includes a virtual encoder module 41 and a motor driving module 42, the control system 4 is electrically connected to the motor 3, and the virtual encoder module 41 is an integrated circuit in the control system 4 and electrically connected to the U, V, W three-phase input terminal of the motor 3 and the input terminal of the motor driving module 42, respectively. The virtual encoder module 41 detects U, V, W three-phase voltage feedback of the motor 3, calculates the magnetic pole position of the rotor of the motor 3 through an internal algorithm thereof, and performs vector control on the motor 3 by using the obtained magnetic pole position.

The motor 3 is a permanent magnet motor.

Further, the control system 4 further comprises a PI control algorithm, the PI control algorithm works in a reference coordinate system of the rotor dp, the PI control algorithm obtains a required result, outputs the result, and generates a three-phase voltage signal which is input to the bridge after PARK inverse transformation and CLARKE inverse transformation. It is to be noted that the PI control algorithm of the present embodiment is a conventional algorithm of the prior art.

Preferably, the virtual encoder module 41 employs the CLARKE transform and the PARK transform in combination with the PI control algorithm, and the encoder-less Field Oriented Control (FOC). The CLARKE transformation first transforms each physical quantity based on the three-axis, two-dimensional stator stationary coordinate system into the two-axis stator stationary coordinate system. The PARK transformation transforms the obtained stator current vector based on an orthogonal coordinate system of the alpha axis and the beta axis into a two-axis system synchronously rotating with the rotation self-flux (namely, the alpha axis and the beta axis are static, and the d axis and the q axis rotate).

Compared with the prior art, the utility model discloses a control system 4 adopts virtual encoder module 41 to realize the function of hardware encoder, obtains motor magnetic pole angle through detecting 3 feedback voltage of motor, current vector parameter calculation and realizes the control to fan motor 3, and need not to install the hardware encoder on motor 3, makes the utility model discloses a cost is lower.

Further, the motor 3 includes a through cover 31, a base 32, a central shaft 33, a bearing set, a stator, an outer rotor 36 and a blank cover 37, the bearing set includes a first bearing 341 and a second bearing 342, the base 32 is connected with the mounting rod 1, the central shaft 33 is connected to the base 32 through the first bearing 341 and the second bearing 342, the first bearing 341 and the second bearing 342 are respectively disposed at two ends of the central shaft 33 and are relatively rotatably connected with the central shaft 33, the stator is disposed outside the base 32, the stator is fixed to the base 32 and is used for driving the outer rotor 36 to rotate when the power is turned on, the stator includes a stator core and a stator winding 35, the stator winding 35 is disposed on the stator core, and preferably, the stator winding 35 is a concentrated winding.

The stator winding 35 is distributed in the motor 3 at equal intervals in a ring shape, and the stator winding 35 is fixed in the motor 3 through screws. Stator winding 35 is at the inside equidistant distribution of annular of motor 3, and stator winding 35 passes through the screw fixation in the inside of motor 3, and the equidistant distribution of annular's stator winding 35 provides magnetic field force to make whole slew velocity increase in order to solve the inefficiency of present traditional motor acceleration and deceleration case transmission mode, the shortcoming that the mounting height requires height and radial magnetic field PMSM poor heat dissipation.

Further, the outer rotor 36 is arranged outside the stator winding 35, the through cover 31 is arranged on the top of the base 32, the blank cover 37 is arranged on the bottom of the base 32, a first groove for placing the first bearing 341 is formed in the middle of the through cover 31, the first bearing 341 is fixedly arranged in the first groove, a second groove for placing the second bearing 342 is formed in the middle of the blank cover 37, the second bearing 342 is fixedly arranged in the second groove, and magnetic steel and magnetic isolation strips (not shown in the figure) are arranged on the inner peripheral side face of the outer rotor 36, so that magnetic fields of the magnetic steel and the magnetic isolation strips are uniformly distributed.

Further, a wire holder (not shown in the figure) is provided on an outer surface of the through cover 31 for outgoing and connecting a power line; lead to lid 31 through connecting piece 5 and blade subassembly 2 axial connection, lead to lid 31 and stifle 37 to be fixed respectively at the both ends of frame 32, the edge of leading to lid 31 and stifle 37 edge all are provided with the step 38 that supplies outer rotor 36 to place, lead to the volume of lid 31 and stifle 37's volume all to be greater than outer rotor 36, play the guard action.

When the power is on, the stator drives the outer rotor 36 to rotate, so as to drive the through cover 31 and the blank cap 37 to rotate, the through cover 31 is axially connected with the blade assembly 2 through the connecting piece 5, so as to drive the blade assembly 2 to rotate, and the rotation of the fan is realized.

The control system of the utility model adopts the virtual encoder module 41 to realize the function of a hardware encoder, obtains the magnetic pole angle of the motor rotor by detecting the feedback voltage of the motor 3 to realize the control of the fan motor 3, and does not need to install the hardware encoder on the motor 3; through changing alternating current motor drive into permanent magnet machine drive, permanent magnet machine has efficient, specific power great, power factor is high, the reliability is high and the advantage of being convenient for maintain, still has advantages such as ultra-thin, big moment of torsion of low-speed and good heat dissipation.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. An outer rotor permanent magnet motor industrial fan which is characterized in that: including installing installation pole, setting on the steel constructs the fixed plate the blade subassembly in the installation pole outside, set up the motor in the installation pole outside and with the control system that the motor electricity is connected, the motor pass through the connecting piece with the blade subassembly is connected, and fixed the setting is in the bottom of blade subassembly, control system includes virtual encoder module and motor drive module, virtual encoder module connects respectively motor drive module's input and output and the motor output end, the motor is permanent-magnet machine.

2. The industrial fan with the outer rotor permanent magnet motor as claimed in claim 1, wherein: the motor comprises a through cover, a machine base, a central shaft, a bearing group, a stator, an outer rotor and a blank cover, wherein the machine base is connected with the installation rod, the central shaft is connected with the machine base through the bearing group, the stator is fixed on the outer side of the machine base, the stator comprises a stator core and a stator winding, the stator winding is arranged on the stator core, the outer rotor is arranged on the outer side of the stator winding, the through cover is arranged at the top of the machine base, and the blank cover is arranged at the bottom of the machine base.

3. The industrial fan with the outer rotor permanent magnet motor as claimed in claim 2, wherein: and the side surface of the inner periphery of the outer rotor is provided with magnetic steel and magnetic isolating strips.

4. The industrial fan with the outer rotor permanent magnet motor as claimed in claim 2, wherein: the through cover and the stifled cover are both provided with bearing spaces for the bearing set to be placed.

5. The industrial fan with the outer rotor permanent magnet motor as claimed in claim 2, wherein: the edge of the through cover and the edge of the blank cover are provided with steps for placing the outer rotor.

6. The industrial fan with the outer rotor permanent magnet motor as claimed in claim 2, wherein: the stator windings are distributed in the motor at equal intervals in an annular mode and are fixed in the motor through screws.

7. The industrial fan with the outer rotor permanent magnet motor as claimed in claim 2, wherein: the stator winding is a concentrated winding.

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