CN206154086U - Electric grinder with switched reluctance motor - Google Patents

Abstract

The utility model discloses an electronic grinding machine with switching formula reluctance motor contains an organism, a drive assembly, a grinding miller and dustproof subassembly, the organism has a first shell and a second shell, drive assembly has one to locate switching formula reluctance motor, one of first shell are located drive module, the connection of second shell switching formula reluctance motor's transmission shaft and one are located the assembly seat of transmission shaft, the assembly seat has a confession the equipment portion that the grinding miller was installed, dustproof subassembly has one to locate the dust cover of first shell. The electric grinder is suitable for the operation conditions of phase failure, frequent start and stop, positive and negative phase conversion and the like because the switched reluctance motor is used as a driving source.

Description

Electric grinder with switched reluctance motor

technical field

The utility model relates to an electric grinder, in particular to an electric grinder with a switching reluctance motor.

Background technique

Press, the electric grinder is a kind of polishing hand tool machine with electric power as the driving source, so that technicians can use the electric grinder to polish or grind the surface of objects such as metal or wood.

For example, the M428013 patent case of Taiwan Patent Publication of China discloses an electric grinding machine, which includes a housing, a brushless motor, a circuit board, a push button switch and a variable resistor. The housing has a first end and a second end, the first end has a head, the second end has a handle, and the handle has a handle extending toward the first end. pressure. The brushless motor is installed in the head. The circuit board is arranged in the handle part and electrically connected to the brushless motor, and the circuit board has a control panel formed on the surface of the handle part. The push button switch has a push button, a limit seat and an elastic member, the push button is arranged on the handle part, the push button has a connecting section extending toward the inside of the housing, the The limiting seat is fixed on the circuit board, and the elastic member is installed between the pressing button and the limiting seat. The variable resistor is installed on the circuit board, and one end of the variable resistor is formed with a regulating rod connected to the connecting section. Further, when the electric grinding machine is actually used, the user can link the control rod through the pressing button, so that the variable resistor produces a resistance change with the change of the position of the control rod, In this way, the circuit board can output different electric powers to the brushless motor, thereby achieving the function of controlling the rotation speed.

However, it can be found from the technical contents of the above-mentioned patents and the composition and structure of general electric grinders, since the brushless motor is mostly a brushless DC motor (Brushless DC Motor, BLDC motor), so that the electric grinder It is quite easy to fail to operate due to the loss of phase (Lost of Phase) during use, and the cogging torque (Cogging Torque) of the brushless DC motor will also make the electric grinder unsuitable for frequent start and stop And the operation status of forward and reverse conversion.

Accordingly, it can be clearly seen from the above content that how to design an electric grinder suitable for operating conditions such as phase loss, frequent start and stop, and positive and negative phase conversion has obviously become a problem to be solved.

Utility model content

The main purpose of this utility model is to provide an electric grinding machine with a switched reluctance motor, which solves the problems that the existing implementation structure cannot be applied to operating conditions such as lack of phase, frequent start and stop, and forward and reverse phase conversion.

To achieve the above purpose, the utility model provides an electric grinding machine with a switched reluctance motor, which includes a machine body, a transmission component, a grinding wheel and a dustproof component. The body has a first shell and a second shell, a chamber is formed inside the first shell, and the second shell is arranged corresponding to the first shell and has an accommodating space communicating with the chamber . The transmission assembly has a switched reluctance motor disposed in the chamber, a switched reluctance motor disposed in the accommodating space and electrically connected to the switched reluctance motor to output a A drive module for controlling signals, a transmission shaft connected to the switched reluctance motor, and an assembly seat installed on the end of the transmission shaft away from the switched reluctance motor, the assembly seat has a drive shaft connected to the transmission The assembling part of the shaft and a flow guiding part which forms a stage difference with the assembling part and deviates from the shaft center of the transmission shaft to generate a cooling air cyclone with the rotation of the transmission shaft. The grinding wheel is mounted on the assembly part and rotates with the transmission shaft. The dustproof assembly includes a dustproof cover mounted on the first shell and forming a gap with the grinding wheel, and a A dust discharge duct connected to the dust cover and corresponding to the second shell to receive a suction air flow from a ventilation device, the dust discharge duct has a corresponding to the accommodating space and uses the suction air flow to the Openings for heat dissipation of the drive module.

In one embodiment, the drive module has a microcontroller for generating the control signal, and a microcontroller electrically connected between the microcontroller and the switched reluctance motor to transmit the control signal to the drive of the switched reluctance motor.

In one embodiment, the switched reluctance motor is a three-phase switched reluctance motor, and the driver is a three-phase half-bridge driver or a three-phase full-bridge driver.

Further, the switched reluctance motor has an outer stator and an inner rotor, and the transmission assembly has a plurality of components disposed on the first housing and facing the inner rotor to monitor the position of the inner rotor to the The drive module outputs a photoelectric switch for monitoring signals.

Wherein, the plurality of photoelectric switches are arranged at intervals with the transmission shaft as the center and at a step angle.

Specifically, the drive module has a variable angle control mechanism and a voltage pulse width modulation control mechanism, and the drive module decides to use the variable angle control mechanism or the voltage pulse width modulation control mechanism to generate the control signal.

In one embodiment, the first shell has at least one air inlet communicating with the chamber to allow external air to enter the chamber.

Further, the transmission assembly has an elastic button arranged on the first shell to trigger the driving module under pressure, and an elastic button pivotally connected to the second shell and extending above the elastic button for interlocking pressing The pressure plate of the elastic button.

Through the above-mentioned embodiment of the utility model, compared with the prior art, it has the following characteristics:

1. The electric grinder of the present invention uses the switched reluctance motor as the driving source, so that the electric grinder can be used in the Operational conditions such as frequent start and stop due to lack of phase, and positive and negative phase conversion.

2. The electric grinder of the present utility model can discharge the heat energy in the chamber through the guide part and take out the heat energy of the drive module together with the dust through the suction airflow when in use. This effectively dissipates heat substantially from the switched reluctance motor.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Description of drawings

Fig. 1 is a perspective view of the utility model.

Fig. 2 is an exploded schematic diagram of the utility model.

Fig. 3 is an exploded schematic diagram of another viewing angle of the present invention.

Fig. 4 is a schematic side view sectional view of the utility model.

FIG. 5 is a schematic circuit diagram of the drive module of the present invention.

Fig. 6 is a schematic top view of the utility model.

Fig. 7 is a top view cross-sectional schematic view of the utility model.

Among them, reference signs:

1 body

11 first shell

110 chambers

111 air intake

112 main shell

113 Subshell

12 second shell

120 storage space

2 transmission components

21 Switched reluctance motor

211 Outer stator

212 inner rotor

213 The first magnetic transmission part

214 Second magnetic conduction part

215 Magnetic convex part

22 drive module

221 microcontroller

222 drives

23 drive shaft

24 Assembly seat

241 Assembly Department

242 diversion unit

25 elastic buttons

26 Platen

27 photoelectric switch

3 grinding wheels

4 Dustproof components

41 Dust cover

42 Dust duct

420 opening

detailed description

The technical content of the present utility model is described as follows with respect to matching diagram now:

Please refer to FIG. 1 and FIG. 2 , the utility model provides an electric grinder with a switched reluctance motor, which includes a machine body 1 , a transmission component 2 , a grinding wheel 3 and a dustproof component 4 . The body 1 has a first shell 11 and a second shell 12. A chamber 110 is formed inside the first shell 11. The second shell 12 has an accommodating space 120. The accommodating space 120 and The chambers 110 communicate with each other. The transmission assembly 2 has a switched reluctance motor 21 (Switched Reluctance Motor), a driving module 22 , a transmission shaft 23 and an assembly base 24 . Wherein, the switched reluctance motor 21 is arranged in the chamber 110 and has an outer stator 211 and an inner rotor 212, and the outer stator 211 and the inner rotor 212 are both made of electromagnetic steel sheets (for example: Silicon steel sheets) are stacked, the driving module 22 is disposed in the accommodating space 120 , and the switched reluctance motor 21 and the driving module 22 are electrically connected to each other. In one embodiment, the cavity 110 of the first shell 11 is cylindrical for the setting of the switched reluctance motor 21 , and the first shell 11 has at least one cavity communicating with the cavity 110 The external air rotates with the switched reluctance motor 21 to enter the air inlet 111 of the chamber 110 . To further illustrate, the first shell 11 is composed of a main shell 112 and a secondary shell 113 mounted on the main shell 112, the chamber 110 is formed inside the main shell 112, and the further The air hole 111 is disposed on the auxiliary shell 113 . In addition, the driving module 22 has a microcontroller 221 and a driver 222 electrically connected between the microcontroller 221 and the switched reluctance motor 21 , and the second shell 12 The accommodating space 120 is elongated for the circuit board (ie, the driving module 22 ) to be disposed. Specifically, the switched reluctance motor 21 is a three-phase switched reluctance motor (3-Phase Switched Reluctance Motor), and the driver 222 can drive the three-phase switched reluctance motor (that is, the A three-phase half-bridge driver (3-Phase Half Bridge Driver) or a three-phase full-bridge driver (3-Phase Full Bridge Driver) actuated by the switched reluctance motor 21 . In one embodiment, the transmission assembly 2 has an elastic button 25 arranged on the first shell 11 to connect the switched reluctance motor 21 and the drive module 22 and a button pivotally connected to the The second shell 12 extends to the pressing plate 26 above the elastic button 25. When the elastic button 25 is not pressed, it will elastically return to a predetermined position, and the pressing plate 26 can be pressed to press the elastic button in unison. button 25. On the other hand, the transmission shaft 23 is connected to the switched reluctance motor 21 and extends to the outside of the first shell 11, and the assembly seat 24 is assembled on the transmission shaft 23 away from the switched reluctance motor. One end of the reluctance motor 21. More clearly, the assembly seat 24 has an assembly part 241 and a flow guide part 242, the assembly part 241 is connected to the transmission shaft 23 and deviates from the axis of the transmission shaft 23, the flow guide part 242 Then it is connected with the assembly part 241 and extends in a direction away from the axis of the transmission shaft 23 . In one embodiment, the air guiding portion 242 is a convex plate (as shown in FIG. 2 ), and in other embodiments, the air guiding portion 242 is at least one fan blade. Finally, the grinding wheel 3 is installed on the assembly part 241, the dustproof assembly 4 has a dustproof cover 41 and a dust discharge duct 42, and the dustproof cover 41 is installed on the first shell 11 And form a gap (as shown in Figure 4) between described grinding wheel 3, described dust discharge conduit 42 is connected with described dust cover 41, and described dust discharge conduit 42 has a corresponding to the described accommodating The opening 420 (as shown in FIG. 4 ) opened in the space 120 .

Please refer to FIGS. 1 to 7 again. When the electric grinding machine of the present utility model is actually used, the drive module 22 is connected to an electric device (not shown in the figure), so that the drive module 22 can be controlled by the Electrical equipment obtains the power required to operate. Next, the user can press the elastic button 25 through the pressing plate 26, so that the drive module 22 is connected to the switched reluctance motor 21, and accordingly, the microcontroller 221 can transmit a control signal to the driver 222, so that the driver 222 drives the inner rotor 212 of the switched reluctance motor 21 to drive the transmission shaft 23 to rotate, and the grinding wheel 3 can be driven by the transmission shaft 23 Rotate to grind the surface of an object (not shown). Wherein, since the electric grinder of the present invention uses the switched reluctance motor 21 as the driving source, the electric grinder can pass through the characteristics of the switched reluctance motor 21 during operation. In the case of Lost of Phase, it can operate normally, and then it can be applied to operating conditions such as frequent start-stop and positive and negative phase conversion.

Based on the above, the present invention further illustrates the actuation relationship between the switched reluctance motor 21 and the driving module 22 . In detail, the driving module 22 has an angle-variable control mechanism (ASR) and a voltage pulse width modulation control mechanism (PWM), and the driving module 22 will control the speed of the switched reluctance motor 21 according to the And adjust the output ratio between the variable angle control mechanism and the voltage pulse width modulation control mechanism. If the speed of the switched reluctance motor 21 is slower, the output ratio of the variable angle control mechanism will increase accordingly; if the speed of the switched reluctance motor 21 is faster, the voltage pulse width modulation control The output ratio of the mechanism increases accordingly. In one embodiment, as shown in FIG. 7 , it is predefined that the inner rotor 212 has a rotation direction relative to the outer stator 211 after being activated by electricity, and the outer stator 211 has a plurality of rotation directions toward the inner rotor. 212, the inner rotor 212 has a plurality of second magnetic conduction portions 214 extending toward the outer stator 211 and a plurality of second magnetic conduction portions 214 extending toward the The magnetically conductive convex portion 215 extending integrally in the rotation direction. After the outer stator 211 is magnetically conductive, the plurality of first magnetically conductive parts 213 respectively attract one of the second magnetically conductive parts 214 to rotate the inner rotor 212 . Wherein, since the utility model has the design of the magnetic conduction convex portion 215, each of the second magnetic conduction portions 214 can be shortened by the magnetic conduction convex portion 215 to which it belongs and the second one of the first magnetic conduction portions 214. The distance between the magnetic permeable parts 213 is such that the switched reluctance motor 21 can pre-trigger the second magnetic permeable part 213 when the plurality of second magnetic permeable parts 214 have not rotated to the next first magnetic permeable part 213 The first magnetically permeable parts 213 are used to attract the plurality of second magnetically permeable parts 214, so that the switched reluctance motor 21 can use the plurality of first magnetically permeable parts 213 and the plurality of The actuating relationship between the two magnetically conductive protrusions 215 is used to increase the rotation speed of the inner rotor 212.

Specifically, in order to enable the driving module 22 to detect the rotation speed of the switched reluctance motor 21, in one embodiment, the transmission assembly 2 has a plurality of For the photoelectric switch 27 of the inner rotor 212, the plurality of photoelectric switches 27 can judge the position and speed of the inner rotor 212 according to the position and frequency of the light beam interrupted by the inner rotor 212, and then according to the inner rotor 212 The position and speed of each of the photoelectric switches 27 transmit a monitoring signal to the driving module 22, so that the driving module 22 can determine the variable angle control mechanism and the voltage pulse width modulation through the monitoring signal of each photoelectric switch 27. The output ratio of the variable control mechanism. In one embodiment, the plurality of photoelectric switches 27 are arranged at intervals with the transmission shaft 23 as the center of a circle and at a step angle (Step Angle), that is, any two of the photoelectric switches 27 and the An included angle (for example: thirty degrees) is formed between the transmission shafts 23 . In addition to providing the monitoring signal through the plurality of photoelectric switches 27 as a reference for judging the position and speed of the inner rotor 212, in other embodiments, the microcontroller 221 can also use the driver 222 to detect the current of the switched reluctance motor 21, and cut off the input current of the switched reluctance motor 21 through the driver 222 when the current value of the switched reluctance motor 21 exceeds the rated current value ( Namely: Over Current Protection [Over Current Protection]), so as to avoid the burnout of the switched reluctance motor 21 due to excessive current. Moreover, the microcontroller 221 also has to adjust the input current of the driver 222 to the switched reluctance motor 21 according to the current of the switched reluctance motor 21 at any time. In this way, when the When the switched reluctance motor 21 has a current change due to the obstruction of the grinding wheel 3 (for example: pressed against the surface of an object), the microcontroller 221 can adjust the current through the feedback of the driver 222. The input current of the switched reluctance motor 21 is adjusted so that the switched reluctance motor 21 can maintain a certain speed when the grinding wheel 3 is blocked or not.

On the other hand, it is worth noting that during the grinding operation of the electric grinder, the guide part 242 will be driven by the transmission shaft 23 to rotate to generate a heat dissipation cyclone, so that the switching magnetic The heat energy generated by the rotation of the resistance motor 21 is discharged to the outside of the chamber 110 along with the cooling cyclone. In addition, since the dust discharge duct 42 will be connected to a ventilation device (not shown in the figure) when the electric grinder is in use, and the drive module 22 is arranged relative to the opening 420, therefore , when the suction air flow generated by the air exhaust device flows through the dust discharge duct 42, the suction air flow will also remove the waste heat and dust generated by the operation of the drive module 22 from the exhaust duct 42. The dust duct 42 is brought out. Accordingly, the electric grinder of the present utility model can discharge the heat energy in the chamber 110 through the guide part 242 and combine the heat energy of the drive module 22 with the suction airflow during use. The dust is brought out together so that the electric grinder can significantly dissipate heat from the switched reluctance motor 21 and the driving module 22 .

To sum up, the utility model discloses an electric grinder with a switched reluctance motor. The electric grinder includes a body, a transmission assembly, a grinding wheel and a dustproof assembly. The body has a first A shell and a second shell, the transmission assembly has a switched reluctance motor set in the first shell, a drive module set in the second shell, a switch connected to the switched reluctance motor The transmission shaft and an assembly seat arranged on the transmission shaft, the assembly seat has an assembly part for the grinding wheel to be installed, and the dustproof component has a dustproof cover arranged on the first shell. Wherein, since the electric grinding machine uses the switched reluctance motor as a driving source, the electric grinding machine can be applied to operating conditions such as phase loss, frequent start and stop, and forward and reverse phase conversion.

Certainly, the utility model also can have other various embodiments, under the situation of not departing from the spirit and essence of the utility model, those skilled in the art can make various corresponding changes and distortions according to the utility model, but these Corresponding changes and deformations should all belong to the protection scope of the claims of the present invention.

Claims (8)

1. An electric grinder with a switched reluctance motor, characterized in that it comprises: A machine body with a first shell and a second shell, a cavity is formed inside the first shell, and the second shell is arranged corresponding to the first shell and has an accommodating space communicating with the cavity ; A transmission assembly having a switched reluctance motor disposed in the cavity, a switched reluctance motor disposed in the accommodating space and electrically connected to the switched reluctance motor to output a A drive module for controlling signals, a transmission shaft connected to the switched reluctance motor, and an assembly seat installed on the end of the transmission shaft away from the switched reluctance motor, the assembly seat has a drive shaft connected to the transmission The assembling part of the shaft and a guide part which forms a step difference with the assembling part and deviates from the shaft center of the transmission shaft so as to generate a heat dissipation cyclone with the rotation of the transmission shaft; and A grinding wheel and a dust-proof assembly, the grinding wheel is installed on the assembly part and rotates with the transmission shaft, the dust-proof assembly includes a A dust-proof cover with a gap and a dust-discharge duct connected to the dust-proof cover and arranged corresponding to the second shell to receive a suction airflow from a ventilation device are formed, and the dust-discharge duct has a corresponding to the accommodating space An opening is opened to dissipate heat from the driving module by the suction airflow. 2. The electric grinder with a switched reluctance motor as claimed in claim 1, wherein the drive module has a microcontroller for generating the control signal and a microcontroller electrically connected to the microcontroller The controller transmits the control signal to the driver of the switched reluctance motor. 3. The electric grinding machine with a switched reluctance motor as claimed in claim 2, wherein the switched reluctance motor is a three-phase switched reluctance motor, and the driver is a three-phase half-bridge driver or a three-phase phase full-bridge driver. 4. The electric grinding machine with a switched reluctance motor as claimed in claim 2, wherein the switched reluctance motor has an outer stator and an inner rotor, and the transmission assembly has a plurality of The first housing faces the inner rotor and is a photoelectric switch for monitoring the position of the inner rotor and outputting a monitoring signal to the driving module. 5 . The electric grinding machine with a switched reluctance motor as claimed in claim 4 , wherein the plurality of photoelectric switches are arranged at intervals with the transmission shaft as the center of a circle and at a step angle. 6. The electric grinder with a switched reluctance motor as claimed in claim 4 or 5, wherein the drive module has a variable angle control mechanism and a voltage pulse width modulation control mechanism, and the drive module according to Each of the monitoring signals transmitted by the plurality of photoelectric switches determines to generate the control signal by the variable angle control mechanism or the voltage pulse width modulation control mechanism. 7. The electric grinding machine with a switched reluctance motor as claimed in claim 1, 2, 3, 4 or 5, wherein the first housing has at least one chamber that communicates with the chamber to allow outside air to enter The air inlet of the chamber. 8. The electric grinding machine with a switched reluctance motor as claimed in claim 7, wherein the transmission assembly has an elastic button arranged on the first housing to trigger the driving module under pressure and a A pressure plate that is pivotally connected to the second shell and extends above the elastic button to press the elastic button in interlocking manner.