CN210697339U

CN210697339U - Motor working circuit, food processor host and food processor

Info

Publication number: CN210697339U
Application number: CN201921184696.2U
Authority: CN
Inventors: 王慧江; 代松
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-06-09
Anticipated expiration: 2029-07-25

Abstract

The utility model provides a motor working circuit, cooking machine host computer and cooking machine. The motor working circuit is applied to the food processor and comprises a motor, a discharge resistor, a change-over switch and a controller. The motor includes a rotor and a stator coil, and the motor includes an operating mode and a braking mode. The discharge resistor is connected in parallel with the rotor. The change-over switch is connected with the rotor and the stator coil. The controller is connected with the change-over switch, and the controller switches the motor between the working mode and the braking mode by controlling the change-over switch. In the working mode, the controller controls the change-over switch to be closed, and the rotor is electrically connected with the stator coil; in the braking mode, the controller controls the change-over switch to be switched on, the rotor is disconnected with the stator coil, and the rotor and the discharge resistor form a discharge loop. The utility model discloses can realize the purpose of the quick brake of motor sparkless.

Description

Motor working circuit, food processor host and food processor

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a motor work circuit, cooking machine host computer and cooking machine.

Background

With the increasing living standard of people, many different types of food processors appear on the market. The functions of the food processor mainly include, but are not limited to, functions of making soybean milk, grinding dry powder, squeezing juice, making minced meat, shaving ice, making coffee, preparing beauty mask for women and the like. The different kinds of functions enrich the life of people.

When the existing food processor is opened and powered off, the motor needs to be stopped immediately. If the cup cover is opened in the operation process of the motor, the motor can continue to operate due to the inertia effect, hot liquid in the cup body can be stirred out to cause scalding or the idle opening can not be stopped immediately, and if a hand and the like contact with a blade to cause potential safety hazards such as incised wound and the like.

In order to stop the food processor immediately when the cover is opened and the power is cut off, the existing technical scheme is that the inductor stored on the rotor is discharged in the opposite direction through the inductor stored on the stator coil of the motor, and the electromotive force of the stator coil is opposite to the electromotive forces at the two ends of the rotor, so that the electromotive force generated by the continuous rotation of the rotor due to inertia is offset, and the motor can effectively brake. However, since the amount of electricity stored in the rotor and the stator coil of the motor itself is relatively large at the moment of stopping the motor, a large spark is often generated when the two electromotive forces are reversely switched on.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a motor working circuit, cooking machine host computer and cooking machine of no spark brake.

An aspect of the utility model provides a motor working circuit, it is applied to in the cooking machine. The motor working circuit comprises a motor, a discharge resistor, a change-over switch and a controller. The motor includes a rotor and stator coils, and the motor includes an operating mode and a braking mode. The discharge resistor is connected in parallel with the rotor. The changeover switch is connected to the rotor and the stator coil. The controller is connected with the change-over switch, and the controller controls the change-over switch to enable the motor to be switched between the working mode and the braking mode. In the working mode, the controller controls the change-over switch to be closed, and the rotor is electrically connected with the stator coil; in the braking mode, the controller controls the change-over switch to be opened, the rotor is disconnected with the stator coil, and the rotor and the discharge resistor form a discharge loop.

Further, the stator coil includes a first stator coil having a first terminal and a second terminal, the rotor has a third terminal and a fourth terminal, and the discharge resistor is connected to the third terminal and the fourth terminal of the rotor, wherein the first terminal of the first stator coil is connected to a live wire, and the second terminal of the first stator coil is connected to the third terminal of the rotor through the changeover switch. Therefore, the on-off of the rotor and the first stator coil can be realized through the change-over switch.

Further, the stator coil further includes a second stator coil having a fifth terminal and a sixth terminal, wherein the fourth terminal of the rotor is connected to the fifth terminal of the second stator coil through the changeover switch, and the sixth terminal of the second stator coil is connected to a zero wire. Therefore, the on-off of the rotor and the second stator coil can be realized through the change-over switch.

Further, the change-over switch includes a first relay and a second relay, wherein the second terminal of the first stator coil and the third terminal of the rotor are connected through the first relay, and the fourth terminal of the rotor and the fifth terminal of the second stator coil are connected through the second relay, so that the rotor and the stator coils can be turned on and off.

Further, the first relay and the second relay are connected to the controller through the same port, so that control logic can be simplified, ports of the controller can be saved, and cost can be saved.

Further, the transfer switch includes a double-pole double-throw relay including a first switch and a second switch which are linked, wherein the second terminal of the first stator coil is connected to the third terminal of the rotor through the first switch, and the fourth terminal of the rotor is connected to the fifth terminal of the second stator coil through the second switch, so that the connection and disconnection between the rotor and the stator coil can be realized, and the device cost can be saved.

Further, the motor working circuit further comprises a motor driving circuit, the motor driving circuit is respectively connected with the controller and the motor, and after the change-over switch is switched on, the controller controls the motor driver to start the motor. Therefore, the motor current cannot suddenly change instantly, the impact on components such as a silicon controlled rectifier is small, and the service life of the relay can be prolonged.

Another aspect of the utility model provides a host computer of material processing machine, it includes as above motor operating circuit.

The utility model discloses a still another aspect provides a cooking machine, it includes as above cooking machine host computer and cup body assembly, cup body assembly detachably install in on the cooking machine host computer.

The food processor further comprises a cup cover assembly and an on-off switch, the motor working circuit is connected to a mains supply through the on-off switch, and the on-off switch is closed when the cup cover assembly is covered; when the cup cover assembly is opened, the on-off switch is switched off. Thereby, the safety protection function of the cup cover can be achieved.

The utility model discloses a motor working circuit, cooking machine host computer and cooking machine can discharge the release through discharge resistance alone rather than through the stator coil when uncapping outage or machine fall the power, consequently, realized the purpose of the quick brake of motor sparkless, the security when having improved the user and using. Moreover, the structure design is simple and the switching is convenient.

Drawings

Fig. 1 is a perspective view of a food processor according to an embodiment of the present invention;

fig. 2 is a circuit block diagram of a motor operating circuit according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a portion of an operating circuit of a motor according to an embodiment of the present invention;

FIG. 4 is a schematic view of the motor shown in FIG. 3 with multiple terminal connections in an operating mode;

FIG. 5 is a schematic view of the motor shown in FIG. 3 with multiple terminal connections in a braking mode;

fig. 6 is a schematic circuit diagram of a portion of an operating circuit of a motor according to another embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a portion of an operating circuit of a motor according to another embodiment of the present invention;

fig. 8 is a flowchart of a motor control method according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Fig. 1 is a perspective view of a food processor 10 according to an embodiment of the present invention. As shown in fig. 1, the food processor 10 of the present invention includes a food processor main machine 11 and a cup body assembly 12, the cup body assembly 12 is detachably mounted on the food processor main machine 11, and when necessary, the two can be separated from each other.

The food processor 10 includes a rotary knife assembly (not shown), the rotary knife assembly is rotatably disposed in the accommodating cavity of the cup body assembly 12, the accommodating cavity is used for accommodating food materials, the rotary knife assembly is driven by a motor 21 (shown in fig. 2) in the food processor main machine 11 to rotate, and the food materials can be stirred or crushed. The rotating knife assembly can be set as a stirring knife assembly, a wall breaking knife assembly or a juicing wheel assembly and the like, and the food processor 10 can be a stirrer, a wall breaking machine or a juicing machine and the like.

In some embodiments, the food processor 10 may further include a lid assembly 13, and the lid assembly 13 may be covered on the cup assembly 12. When the food processor 10 works, the cup cover assembly 13 is covered on the cup body assembly 12. After the food processor 10 finishes working, the cup cover assembly 13 can be taken down from the cup body assembly 12. In some embodiments, the lid assembly 13 can be opened to add food during the cooking process of the cooking machine 10.

The processor host 11 includes a host housing 111 and a main control board (not shown) located in the host housing 111. The processor host 11 includes a motor operating circuit 20, and the motor operating circuit 20 can be disposed on the main control board. Fig. 2 discloses a circuit block diagram of the motor operating circuit 20 according to an embodiment of the present invention, and fig. 3 discloses a partial circuit schematic diagram of the motor operating circuit 20 according to an embodiment of the present invention. As shown in fig. 2 and 3, the motor operating circuit 20 includes a motor 21, a discharge resistor R, a changeover switch 22, and a controller 23. The motor 21, which includes the rotor M and stator coils, may drive the rotary knife assembly in the cup assembly 12 to rotate, and the motor 21 includes an operating mode and a braking mode.

The discharge resistor R is connected in parallel with the rotor M. The discharge resistor R can adopt a high-voltage pulse resistor, can be formed by connecting one or more resistors, has an equivalent resistance value of 100K-1M omega and can resist high voltage. The discharge speed of the rotor M can be adjusted by adjusting the resistance value of the discharge resistor R, so that the stop speed of the motor 21 can be adjusted.

The changeover switch 22 is connected to the rotor M and the stator coil. The controller 23 may comprise a single chip or other microcontroller. The controller 23 is connected to the changeover switch 22 and controls the operation of the changeover switch 22. The controller 23 controls the changeover switch 22 so that the motor 21 can be switched between the operating mode and the braking mode.

In the working mode, the controller 23 controls the change-over switch 22 to be closed, and the rotor M is electrically connected with the stator coil; in the braking mode, the controller 23 controls the switch 22 to be opened, the rotor M is disconnected from the stator coil, and the rotor M and the discharge resistor R form a discharge loop.

The utility model discloses a motor operating circuit 20 is through parallelly connected a discharge resistance R on rotor M, when the power failure or the machine power failure of uncapping, through being connected of disconnection rotor M and stator coil, supply rotor M to discharge alone through discharge resistance R simultaneously, therefore, rotor M passes through discharge resistance R release residual electromotive force during the outage brake, and not through stator coil's residual electromotive force of reverse electromotive force release like prior art, so, can not produce spark or pulse, realized the purpose of no spark brake, safety and reliability.

Furthermore, the utility model discloses a motor operating circuit 20 can adjust the discharge speed of rotor M through the resistance of adjustment discharge resistance R to can reach the purpose of motor 21 quick brake, its structural design is very simple and easy.

As shown in fig. 2, the motor operating circuit 20 includes a switching power supply 25, and the switching power supply 25 is connected between a live line ACL and a null line ACN of the utility power supply, and is electrically connected to the controller 23, so as to convert the strong ac power output by the utility power supply into weak ac power to supply power to the controller 23.

In some embodiments, the motor operating circuit 20 of the present invention may further include an on/off switch ST, and the motor operating circuit 20 is connected to the commercial power supply through the on/off switch ST. In one embodiment, the on-off switch ST may be disposed on the main control board of the processor host 11.

When the cup cover assembly 13 is closed, the on-off switch ST is closed, the motor working circuit 20 is electrically connected with the mains supply, the whole motor working circuit 20 is powered on, and at the moment, the food processor 10 can work; when the cover assembly 13 is opened, the on-off switch ST is switched off, the motor working circuit 20 is disconnected from the mains supply, the whole motor working circuit 20 is switched off, and at the moment, the food processer 10 cannot work. Therefore, the cup cover safety protection effect can be achieved, and safety accidents possibly caused by mistakenly opening the cup cover assembly 13 in the working process of the motor 21 are avoided.

With continued reference to fig. 2 and 3, the stator coil includes a first stator coil L1. The first stator coil L1 has a first terminal T1 and a second terminal T2, and the rotor M has a third terminal T3 and a fourth terminal T4. The discharge resistor R is connected to the third terminal T3 and the fourth terminal T4 of the rotor M. The first terminal T1 of the first stator coil L1 is connected to the live line ACL, and the second terminal T2 of the first stator coil L1 is connected to the third terminal T3 of the rotor M through the changeover switch 22. Therefore, the on/off of the rotor M and the first stator coil L1 can be realized by the changeover switch 22.

In some embodiments, the stator coil further includes a second stator coil L2, the second stator coil L2 having a fifth terminal T5 and a sixth terminal T6. The fourth terminal T4 of the rotor M is connected to the fifth terminal T5 of the second stator coil L2 via the changeover switch 22, and the sixth terminal T6 of the second stator coil L2 is connected to the neutral line ACN. Thus, the on/off of the rotor M and the second stator coil L2 can be realized by the changeover switch 22.

In one embodiment, the transfer switch 22 may include a first relay K1 and a second relay K2. The second terminal T2 of the first stator coil L1 is connected to the third terminal T3 of the rotor M through a first relay K1, and the fourth terminal T4 of the rotor M is connected to the fifth terminal T5 of the second stator coil L2 through a second relay K2. As shown in fig. 3, the first relay K1 and the second relay K2 are respectively connected to a direct-current power supply Vcc, a coil in the first relay K1 and a coil in the second relay K2 are respectively supplied with power by the direct-current power supply Vcc, and the first relay K1 and the second relay K2 are respectively connected to the controller 23 through two different ports, for example, an RLY1 port and an RLY2 port, for outputting a high-low level. The switch static contact of the first relay K1 is connected with the second terminal T2 of the first stator coil L1, and the switch movable contact of the first relay K1 is connected with the third terminal T3 of the rotor M. A switch fixed contact of the second relay K2 is connected to the fourth terminal T4 of the rotor M, and a switch movable contact of the second relay K2 is connected to the fifth terminal T5 of the second stator coil L2.

In some embodiments, a first freewheeling diode D1 is connected in parallel across the coil of the first relay K1, and the first freewheeling diode D1 is used to discharge the coil of the first relay K1. A second freewheeling diode D2 is connected in parallel across the coil of the second relay K2, and the second freewheeling diode D2 is used to discharge the coil of the second relay K2.

The motor operating circuit 20 also includes a motor drive circuit 24. As shown in fig. 3, the motor driving circuit 24 may include, for example, a first thyristor SCR1, and the first thyristor SCR1 is connected in series with the motor 21 and is connected to a commercial power supply. The first SCR1 is electrically connected to the controller 23, and the controller 23 can control the on-time of the first SCR1, so that the motor 21 can operate at different speeds. The motor drive circuit 24 may further include a capacitor C and a first resistor R1 connected in series between the first electrode and the second electrode of the first thyristor SCR 1. The capacitor C and the first resistor R1 form an RC absorption loop, which can absorb the electric spark generated at the moment when the first silicon controlled device SCR1 is turned off or turned on, and protect the first silicon controlled device SCR1 from being damaged by the transient pulse.

The motor drive circuit 24 may also include an opto-coupler U. The photoelectric coupler U has good isolation effect on input and output electric signals, so that the safety of the circuit is improved. In some embodiments, the optocoupler U may be, for example, a thyristor optocoupler. In other embodiments, the optocoupler U can also be other types of optocouplers. The photocoupler U includes a light emitting diode ED and a second silicon controlled device SCR 2. The input end of the photoelectric coupler U is connected to a Motor port of the controller 23 for outputting high and low levels, and the output end of the photoelectric coupler U is connected to the first silicon controlled rectifier device SCR 1. The anode of the led is connected to the dc power Vcc through a second resistor R2, and the cathode of the led is connected to the Motor port of the controller 23. When the Motor port outputs a low level, the light emitting diode ED has a current flowing through it, the second silicon controlled device SCR2 of the photoelectric coupler U is turned on, and at this time, the first silicon controlled device SCR1 is also turned on. On the contrary, when the Motor port outputs a high level, no current flows through the light emitting diode ED, the second silicon controlled device SCR2 of the photoelectric coupler U is turned off, and at this time, the first silicon controlled device SCR1 is also turned off.

In the illustrated embodiment, the motor driving circuit 24 may further include a third resistor R3 connected between the second silicon controlled device SCR2 of the photocoupler U and the control electrode of the first silicon controlled device SCR 1. When the voltage across the third resistor R3 reaches the turn-on voltage of the second thyristor SCR2, the second thyristor SCR2 turns on. In the illustrated embodiment, the motor driving circuit 2424 may further include a fourth resistor R4 connected between the second silicon controlled device SCR2 of the photo-coupler U and the second electrode of the first silicon controlled device SCR 1.

The controller 23 controls the switch 22 to connect or disconnect the motor driving circuit 24 and the motor 21, and the controller 23 controls the motor driving circuit 24 to drive the motor 21 a period of time after the switch 22 is controlled to connect the motor driving circuit 24 and the motor 21. In one embodiment, the controller 23 may delay the motor 21 by about 100 ms and 500ms, and in another embodiment, the controller 23 may delay the motor 21 by about 200 ms. So can realize motor 21 soft start, motor 21 is in soft start, and the electric current can not be sudden change in the twinkling of an eye, can protect the silicon controlled rectifier device in the circuit to avoid strikeing in the twinkling of an eye at motor 21 starts, extension device life. The motor 21 operates normally after the soft start is completed.

Fig. 4 is a schematic diagram showing the connection of multiple terminals of the motor 21 in an operating mode. As shown in fig. 4 with reference to fig. 3, when the RLY1 port and the RLY2 port of the controller 23 output a low level, the first relay K1 and the second relay K2 are engaged, at this time, the second terminal T2 of the first stator coil L1 is electrically connected to the third terminal T3 of the rotor M, and the fourth terminal T4 of the rotor M is electrically connected to the fifth terminal T5 of the second stator coil L2, since the first terminal T1 of the first stator coil L1 is connected to the live ACL of the mains power supply and the sixth terminal T6 of the second stator coil L2 is connected to the neutral ACN of the mains power supply, the first stator coil L1, the rotor M, and the second stator coil L2 form a loop with the mains power supply, and the motor 21 enters a normal connection state, so that the motor 21 can rotate.

Fig. 5 is a schematic diagram showing the connection of a plurality of terminals of the motor 21 in the braking mode. As shown in fig. 5 with reference to fig. 3, when the cover is opened and the power is off or the machine is powered off, the first SCR1 is turned off, the first relay K1 and the second relay K2 are automatically turned off, at this time, the second terminal T2 of the first stator coil L1 is disconnected from the third terminal T3 of the rotor M, the fourth terminal T4 of the rotor M is disconnected from the fifth terminal T5 of the second stator coil L2, the first stator coil L1 is disconnected from the rotor M and the second stator coil L2, the rotor M and the discharge resistor R form a discharge loop, the rotor M releases the electromotive force stored inside through the discharge resistor R, and the motor 21 stops rotating when the brake is stopped.

The utility model discloses an among the motor work circuit 20, when first relay K1 and second relay K2 actuation back delay a period soft start motor 21 again, can ensure just the current-carrying after first relay K1 and second relay K2 actuation to prolong first relay K1 and second relay K2 life. In addition, the motor 21 is soft started after the first relay K1 and the second relay K2 are attracted, the motor 21 is slowly started, the current of the motor cannot suddenly change instantly, and the impact on components such as a silicon controlled rectifier is small.

The utility model discloses an among the motor operating circuit 20, after first relay K1 and second relay K2 disconnection, discharge resistance R supplied rotor M alone to discharge and uses, and discharge efficiency is higher, and motor 21 stops soon, realizes motor 21 quick brake purpose.

Fig. 6 shows a schematic circuit diagram of a portion of the motor operating circuit 20 according to another embodiment of the present invention. As shown in fig. 6, unlike the motor operating circuit 20 shown in fig. 3, in the motor operating circuit 20 of fig. 6, the first relay K1 and the second relay K2 are connected to the controller 23 through the same port, for example, an RLY port. Therefore, the controller 23 can switch the first relay K1 and the second relay K2 at the same time, which can simplify the control logic, save ports of the controller 23, and save cost.

Fig. 7 is a schematic circuit diagram of a portion of a motor operating circuit 20 according to another embodiment of the present invention. As shown in fig. 7, unlike the motor operating circuit 20 shown in fig. 3, in the motor operating circuit 20 of fig. 7, the changeover switch 22 may include a double pole double throw relay K, and the first relay K1 and the second relay K2 of fig. 3 are replaced with the double pole double throw relay K, so that the device cost can be saved.

The double-pole double-throw relay K comprises a first knife switch S1 and a second knife switch S2 which are arranged in a linkage mode. The second terminal T2 of the first stator coil L1 is connected to the third terminal T3 of the rotor M through a first switch S1, and the fourth terminal T4 of the rotor M is connected to the fifth terminal T5 of the second stator coil L2 through a second switch S2.

When the RLY port of the controller 23 outputs a low level, the first switch S1 and the second switch S2 of the double pole double throw relay K are simultaneously closed, and at this time, the second terminal T2 of the first stator coil L1 is electrically connected to the third terminal T3 of the rotor M, and the fourth terminal T4 of the rotor M is electrically connected to the fifth terminal T5 of the second stator coil L2, so that the first stator coil L1, the rotor M, and the second stator coil L2 are all electrically connected, and the motor 21 enters a normal connection state.

When the cover is opened and the power is off or the machine is powered off, the first silicon controlled device SCR1 is cut off, the first knife switch S1 and the second knife switch S2 of the double-pole double-throw relay K are automatically disconnected, at the moment, the second terminal T2 of the first stator coil L1 is disconnected with the third terminal T3 of the rotor M, the fourth terminal T4 of the rotor M is disconnected with the fifth terminal T5 of the second stator coil L2, and the first stator coil L1 is disconnected with the rotor M and the rotor M is disconnected with the second stator coil L2.

The motor operating circuit 20 shown in fig. 6 and 7 has similar beneficial technical effects as the motor operating circuit 20 shown in fig. 3, and therefore, the detailed description thereof is omitted.

It should be noted that the transfer switch 22 of the present invention is not limited to a relay, and in other embodiments, other types of switching devices may be used as the transfer switch 22. However, all the switch devices capable of realizing the on-off of the rotor and the stator coil are within the protection scope of the invention.

The utility model discloses the remaining electromotive force of motor operating circuit 20 rotor M storage when power failure or the machine falls the electricity of uncapping can discharge the release through discharge resistance R alone rather than through stator coil, consequently, has realized the purpose of the no spark quick brake of motor 21, has improved the security when the user uses. Moreover, the structure design is simple and the switching is convenient.

Fig. 8 is a flowchart illustrating a motor control method according to an embodiment of the present invention. As shown in fig. 8, the motor control method according to an embodiment of the present invention may include steps S1 to S7.

In step S1, when the motor 21 starts to operate after the food processor 10 is powered on, the RLY1 port and RLY2 port of the controller 23 are set to low level.

In step S2, the first relay K1 and the second relay K2 are engaged, and the rotor M of the motor 21 is electrically connected to the stator coil.

In step S3, a delay time of, for example, 200ms is set to ensure that the first relay K1 and the second relay K2 are engaged, and the Motor port of the controller 23 is controlled to soft start the Motor 21.

In step S4, after the motor 21 is soft-started, the motor 21 operates normally.

In step S5, determine is the case where the door is opened and the power is turned off or the machine is powered off? If the determination result is yes, the process proceeds to step S6. Otherwise, the process returns to step S4, and the motor 21 continues to operate normally.

In step S6, when the door is opened and the power is off or the machine is powered off, the first SCR1 is automatically turned off, the first relay K1 and the second relay K2 are automatically turned off, and at this time, the rotor M of the motor 21 is disconnected from the stator coil.

In step S7, the rotor M of the motor 21 releases the residual electromotive force through the discharge resistor R, and the motor 21 is braked and stopped.

The utility model discloses a motor control method is through the disconnection of uncapping or the machine discharges the release through discharge resistance R alone with the residual electromotive force of rotor M storage when falling the electricity rather than through the stator coil, consequently, has realized the purpose of the quick brake of motor 21 no spark, has improved the security when the user uses. And the control mode is simple and convenient.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a motor operating circuit, its characterized in that is applied to in cooking machine (10): it includes:

an electric motor (21) comprising a rotor and stator coils, said electric motor (21) comprising an operating mode and a braking mode;

a discharge resistor connected in parallel with the rotor;

a changeover switch (22) connected to the rotor and the stator coil; and

a controller (23) connected to the changeover switch (22), the controller (23) switching the motor (21) between the operating mode and the braking mode by controlling the changeover switch (22),

wherein, in the working mode, the controller (23) controls the change-over switch (22) to be closed, and the rotor and the stator coil are electrically connected; in the braking mode, the controller (23) controls the change-over switch (22) to be opened, the rotor is disconnected from the stator coil, and the rotor and the discharge resistor form a discharge loop.

2. The motor operating circuit of claim 1, wherein: the stator coil includes a first stator coil having a first terminal and a second terminal, the rotor has a third terminal and a fourth terminal, and the discharge resistor is connected to the third terminal and the fourth terminal of the rotor, wherein the first terminal of the first stator coil is connected to a live wire, and the second terminal of the first stator coil is connected to the third terminal of the rotor through the changeover switch.

3. The motor operating circuit of claim 2, wherein: the stator coil further comprises a second stator coil having a fifth terminal and a sixth terminal, wherein the fourth terminal of the rotor is connected to the fifth terminal of the second stator coil through the changeover switch (22), and the sixth terminal of the second stator coil is connected to a zero wire.

4. The motor operating circuit of claim 3, wherein: the changeover switch (22) includes a first relay and a second relay, wherein the second terminal of the first stator coil and the third terminal of the rotor are connected through the first relay, and the fourth terminal of the rotor and the fifth terminal of the second stator coil are connected through the second relay.

5. The motor operating circuit of claim 4, wherein: the first relay and the second relay are connected to the controller (23) through the same port.

6. The motor operating circuit of claim 3, wherein: the transfer switch (22) includes a double-pole double-throw relay including a first switch and a second switch which are linked, wherein the second terminal of the first stator coil and the third terminal of the rotor are connected through the first switch, and the fourth terminal of the rotor and the fifth terminal of the second stator coil are connected through the second switch.

7. The motor operating circuit of claim 1, wherein: it still includes:

and the motor driving circuit (24) is respectively connected with the controller (23) and the motor (21), and after the change-over switch (22) is closed, the controller (23) controls the motor driving circuit (24) to start the motor (21).

8. A kind of host computer of the material processor, characterized by: comprising an electric motor operating circuit (20) according to any one of claims 1 to 7.

9. A cooking machine, its characterized in that: it includes:

the processor host (11) according to claim 8; and

and the cup body assembly (12) is detachably mounted on the processor host (11).

10. The food processor of claim 9, wherein: it still includes:

a cup cover assembly (13); and

an on-off switch, through which the motor working circuit (20) is connected to a mains supply,

when the cup cover assembly (13) is closed, the on-off switch is closed; when the cup cover assembly (13) is opened, the on-off switch is switched off.