CN213783173U - Motor speed regulating circuit of food processor and food processor - Google Patents

Abstract

The application provides a motor speed governing circuit and cooking machine of cooking machine. The motor speed regulating circuit comprises a first power supply connecting end, a second power supply connecting end, a motor, a switch circuit and a controller. The motor includes a plurality of stator windings, and a plurality of stator windings include first stator winding, second stator winding, third stator winding and fourth stator winding, and a plurality of stator windings still include a plurality of UNICOM's states, and under the intercommunication state of difference, first stator winding, second stator winding, third stator winding and fourth stator winding are different with the electric circuit loop that communicates of first power connection end and second power connection end. The switching circuit is electrically connected to the plurality of stator windings. The controller is connected with the switching circuit, and controls the switching circuit to switch the stator winding among a plurality of communication states. The food processor comprises a motor speed regulating circuit. This application changes stator winding's number of turns through so setting to enlarge the rotational speed scope of motor, realize the motor speed governing, and the life of extension motor.

Description

Motor speed regulating circuit of food processor and food processor

Technical Field

The application relates to the field of small household appliances, in particular to a motor speed regulating circuit of a food processor and the food processor.

Background

In the related art, most food processors use single-phase two-pole series motors, however, the number of turns of the stator of each single-phase two-pole series motor is fixed, and the number of turns of the stator is not adjustable, so that the working rotating speed range of the motor is fixed, and the rotating speed range is narrow.

SUMMERY OF THE UTILITY MODEL

The application provides a motor speed regulating circuit aiming at expanding a rotating speed range.

The application provides motor speed governing circuit and cooking machine of cooking machine, wherein includes:

a first power connection terminal and a second power connection terminal;

an electric machine comprising a plurality of stator windings, the plurality of stator windings comprising a first stator winding, a second stator winding, a third stator winding, and a fourth stator winding, the plurality of stator windings comprising a plurality of connected states, the first stator winding, the second stator winding, the third stator winding, and the fourth stator winding being different in electrical communication loops with the first power connection end and the second power connection end in different connected states;

a switching circuit electrically connected to the plurality of stator windings; and

and the controller is connected with the switching circuit and controls the switching circuit to switch the stator winding among the plurality of communication states so as to control the rotating speed of the motor.

The application provides a cooking machine's motor speed governing circuit includes first power connection end, second power connection end, motor, switch circuit and controller. Under the communicating state of difference, first stator winding, second stator winding, third stator winding and fourth stator winding, it is different with the electric communication return circuit of first power connection end and second power connection end, controller control switch circuit makes stator winding switch between a plurality of communicating states, so, changes stator winding's the number of turns to enlarge the rotational speed scope of motor, realize the speed governing of motor wider.

Optionally, the switching circuit includes a plurality of switching sub-circuits electrically connected to the first stator winding, the second stator winding, the third stator winding, and the fourth stator winding;

the plurality of stator windings comprise a first communication state, a second communication state and a third communication state, the controller is electrically connected with the plurality of switch sub-circuits and controls the plurality of switch sub-circuits to switch the stator windings among the first communication state, the second communication state and the third communication state;

in the first connection state, the first stator winding and the second stator winding are connected in series to the first power supply connection terminal, and the third stator winding and the fourth stator winding are connected in series to the second power supply connection terminal;

in the second connection state, one of the first stator winding and the second stator winding is connected to the first power connection terminal and the other is disconnected from the first power connection terminal, and one of the third stator winding and the fourth stator winding is connected to the second power connection terminal and the other is disconnected from the second power connection terminal;

in the third communication state, the first stator winding and the second stator winding are connected in parallel and communicated with the first power supply connection end, and the third stator winding and the fourth stator winding are connected in parallel and communicated with the second power supply connection end. In some embodiments, the controller controls the plurality of switch sub-circuits to switch the stator windings between the first communication state, the second communication state, and the third communication state to achieve a greater range of speed regulation of the motor.

Optionally, the motor includes a first brush, a second brush, a third brush, and a fourth brush; the plurality of switch sub-circuits include a first switch sub-circuit and a second switch sub-circuit, the first switch sub-circuit is electrically connected between the first brush and the second brush, and the second switch sub-circuit is electrically connected between the third brush and the fourth brush;

in the first communication state, the first stator winding and the second stator winding connected in series are in communication with the first brush and the second brush, and the third stator winding and the fourth stator winding connected in series are in communication with the third brush and the fourth brush;

in the second communication state, one of the first stator winding and the second stator winding communicates with one of the first brush and the second brush, and one of the third stator winding and the fourth stator winding communicates with one of the third brush and the fourth brush;

in the third communication state, the first stator winding is in communication with the first brush, the second stator winding is in communication with the second brush, the third stator winding is in communication with the third brush, and the fourth stator winding is in communication with the fourth brush. In some embodiments, different communication modes can be suitable for different loads, so that the application range is wider.

Optionally, the plurality of switch sub-circuits comprise:

a third switch sub-circuit electrically connected to the first power connection terminal, the first stator winding, and the second stator winding to switch the first power connection terminal between the first stator winding and the second stator winding; and

and the fourth switch sub-circuit is electrically connected with the second stator winding, the first switch sub-circuit and the third switch sub-circuit, so that the second stator winding is switched between the first switch sub-circuit and the third switch sub-circuit. In some embodiments, the circuit is simple in structure.

Optionally, the plurality of switch sub-circuits comprise:

a fifth switch sub-circuit electrically connected to the second power connection terminal, the third stator winding, and the fourth stator winding, for switching the second power connection terminal between the third stator winding and the fourth stator winding; and

and a sixth switch sub-circuit electrically connected to the fourth stator winding, the second switch sub-circuit and the fifth switch sub-circuit, so that the fourth stator winding is switched between the second switch sub-circuit and the fifth switch sub-circuit. In some embodiments, the circuit is simple in structure.

Optionally, the switch sub-circuit includes a switch and a switch control circuit, the switch is electrically connected to the stator winding, the switch control circuit is connected to the switch, the controller is electrically connected to the switch control circuit, and the switch control circuit controls the switch.

Optionally, the switch control circuit includes a triode, a base of the triode is electrically connected to the controller, one of a collector and an emitter of the triode is electrically connected to the switch, the other of the collector and the emitter of the triode is grounded, and the controller controls the triode to control the switch. In some embodiments, the cost is low and the circuit is simple.

Optionally, the motor speed regulation circuit further includes:

the power supply circuit is electrically connected to the first power supply connecting end and the second power supply connecting end and converts the voltage of a power supply into the working voltage of the controller; and/or

The motor driving circuit is electrically connected to the second power supply connecting end and the controller, and the controller controls the motor driving circuit to drive the motor; and/or

The rotating speed detection circuit is electrically connected with the controller and is used for detecting the rotating speed of the motor; and/or

And the current detection circuit is electrically connected with the controller and is used for detecting the working current of the motor.

Optionally, the motor is a four-pole series motor. In some embodiments, the quadrupole series motor is low, so that the height of the food processor is low.

The application also provides a cooking machine, including:

the stirring cup comprises a stirring knife component; and

the motor speed regulating circuit of cooking machine as described in any one of the above, the motor speed regulating circuit the motor with the stirring knife assembly is connected, drives the stirring knife assembly to rotate.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a cross-sectional view of the food processor of the present application;

fig. 2 is a schematic structural diagram of a motor of the food processor of the present application;

fig. 3 is a circuit block diagram of a motor speed regulation circuit of the food processor provided in the present application;

fig. 4 is a circuit diagram of a motor speed regulation circuit of the food processor of the present application;

fig. 5 is a circuit wiring diagram of a motor speed regulating circuit of the food processor provided by the present application;

fig. 6 is a circuit wiring diagram of a plurality of stator windings of the food processor of the present application in a first communication state;

fig. 7 is a circuit wiring diagram of a plurality of stator windings of the food processor of the present application in a second communication state;

fig. 8 is a circuit wiring diagram of a plurality of stator windings of the food processor of the present application in a third communication state.

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 application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, 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 application. 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.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application 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.

The application provides a motor speed governing circuit is used for cooking machine. The motor speed regulating circuit is used for regulating the rotating speed of the motor. The motor speed regulating circuit comprises a first power supply connecting end, a second power supply connecting end, a motor, a switch circuit and a controller. The motor includes a plurality of stator windings, and a plurality of stator windings include first stator winding, second stator winding, third stator winding and fourth stator winding, and a plurality of stator windings still include a plurality of UNICOM's states, and under the intercommunication state of difference, first stator winding, second stator winding, third stator winding and fourth stator winding are different with the electric circuit loop that communicates of first power connection end and second power connection end. The switching circuit is electrically connected to the plurality of stator windings. The controller is connected with the switch circuit, and the switch circuit is controlled to switch the stator winding among a plurality of communication states, so that the number of turns of the stator winding is changed to enlarge the rotating speed range of the motor and realize the wider speed regulation of the motor.

Fig. 1 is a cross-sectional view of an embodiment of a food processor 1 provided in the present application. As shown in fig. 1, the food processor 1 includes a stirring cup 10, the stirring cup 10 includes a stirring blade assembly 100, and the stirring blade assembly 100 is used for crushing food materials in the stirring cup 10, and may include granular food materials, such as fruit pieces that can be crushed, and food pieces that are sticky to stir. In some embodiments, the food processor 1 includes a base 12, the stirring cup 10 is disposed on the base 12, and a motor 121 is installed in the base 12, and the motor 121 is connected to the stirring blade assembly 100 for driving the stirring blade assembly 100 to rotate.

Fig. 2 is a schematic structural diagram of the motor 121 of the food processor 1 provided in the present application. Referring to fig. 2, in some embodiments, the electric machine 121 includes a plurality of stator windings 2, the plurality of stator windings 2 including a first stator winding 20, a second stator winding 21, a third stator winding 22, and a fourth stator winding 23. The motor 121 includes a first brush 110, a second brush 111, a third brush 112, and a fourth brush 113, as well as a rotor winding 114, a commutator 115. In some embodiments, first stator winding 20 is electrically connected to first brush 110, second stator winding 21 is electrically connected to second brush 111, third stator winding 22 is electrically connected to second brush 112, fourth stator winding 23 is electrically connected to fourth brush 113, first brush 110, second brush 111, third brush 112, and fourth brush 113 are each connected to rotor winding 114 and commutator 115, wherein first brush 110 is configured to conduct electrical signals between first stator winding 20 and rotor winding 114, second brush 111 is configured to conduct electrical signals between second stator winding 21 and rotor winding 114, third brush 112 is configured to conduct electrical signals between third stator winding 22 and rotor winding 114, fourth brush 113 is configured to conduct electrical signals between fourth stator winding 23 and rotor winding 114, and commutator 115 is configured to convert an ac potential to an inter-brush dc potential.

Fig. 3 is a circuit block diagram of the motor speed regulating circuit 3 of the food processor 1 provided in the present application. Fig. 4 is a circuit diagram of an embodiment of the motor speed regulating circuit 3 of the food processor 1 provided in the present application. Fig. 5 is a circuit wiring diagram of the motor speed regulating circuit 3 of the food processor 1 provided by the present application. Referring to fig. 3-5, in some embodiments, the motor speed regulation circuit 3 includes a first power connection terminal L and a second power connection terminal N. The plurality of stator windings 2 include a plurality of connected states in which the first stator winding 20, the second stator winding 21, the third stator winding 22 and the fourth stator winding 23 are electrically connected in different loops from the first power connection terminal L and the second power connection terminal N. A plurality of stator winding 2 are through switching between the intercommunication state of a plurality of differences for first stator winding 20, second stator winding 21, third stator winding 22 and fourth stator winding 23, it is different with the electric communication return circuit of first power connection end L and second power connection end N, change the number of turns of stator winding 2 so, can enlarge the rotational speed scope of motor 121, realize the speed governing of motor 121 wider, thereby be applicable to different loads, can be convenient for smash not equidimension load, can prolong the life of motor 121.

In some embodiments, the motor speed control circuit 3 includes a switching circuit 30 and a controller 31, the switching circuit 30 is electrically connected to the plurality of stator windings 2, the controller 31 is connected to the switching circuit 30, and the controller 31 controls the switching circuit 30 to switch the stator windings 2 between a plurality of connected states to control the rotation speed of the motor 121. The controller 31 controls the on/off of the switch circuit 30, so that the plurality of stator windings 2 are controlled to be switched among a plurality of connected states, the wiring mode of the motor 121 is changed, the speed regulation of the motor 121 is realized, the crushing effect is improved, and the crushing device is suitable for crushing loads of different sizes.

In some embodiments, the switching circuit 30 includes a plurality of switching sub-circuits 300 electrically connected to the first stator winding 20, the second stator winding 21, the third stator winding 22, and the fourth stator winding 23; the plurality of stator windings 2 include a first communication state, a second communication state, and a third communication state, the controller 31 is electrically connected to the plurality of switch sub-circuits 300, and controls the plurality of switch sub-circuits 300 to switch the stator windings 2 among the first communication state, the second communication state, and the third communication state. The plurality of switch sub-circuits 300 are respectively electrically connected with the first stator winding 20, the second stator winding 21, the third stator winding 22 and the fourth stator winding 23, and the controller 31 is electrically connected with the plurality of switch sub-circuits 300, so that the first stator winding 20, the second stator winding 21, the third stator winding 22 and the fourth stator winding 23 are switched among a first communication state, a second communication state and a third communication state through the controller 31, the number of turns of the stator winding 2 is changed, and the speed regulation of the motor 121 is realized.

In some embodiments, as shown in fig. 5, the plurality of switch sub-circuits 300 includes a first switch sub-circuit 3000 and a second switch sub-circuit 3001, the first switch sub-circuit 3000 being electrically connected between the first brush 110 and the second brush 111, and the second switch sub-circuit 3001 being electrically connected between the third brush 112 and the fourth brush 113. The first switch sub-circuit 3000 is used to switch on the first brush 110 and the second brush 111, and the second switch sub-circuit 3001 is used to switch on the third brush 112 and the fourth brush 113 to change the wiring manner of the motor 121.

In some embodiments, the plurality of switch subcircuits 300 includes a third switch subcircuit 3002 and a fourth switch subcircuit 3003. The third switching sub-circuit 3002 is electrically connected to the first power supply connection terminal L, the first stator winding 20 and the second stator winding 21, so that the first power supply connection terminal L is switched between the first stator winding 20 and the second stator winding 21. The fourth switch sub-circuit 3003 is electrically connected to the second stator winding 21, the first switch sub-circuit 3000, and the third switch sub-circuit 3002, so that the second stator winding 21 is switched between the first switch sub-circuit 3000 and the third switch sub-circuit 3002.

The plurality of switch sub-circuits 300 includes a fifth switch sub-circuit 3004 and a sixth switch sub-circuit 3005. The fifth switch sub-circuit 3004 is electrically connected to the second power connection terminal N, the third stator winding 22 and the fourth stator winding 23, so that the second power connection terminal N is switched between the third stator winding 22 and the fourth stator winding 23. The sixth switch sub-circuit 3005 is electrically connected to the fourth stator winding 23, the second switch sub-circuit 3001, and the fifth switch sub-circuit 3004, so that the fourth stator winding 23 is switched between the second switch sub-circuit 3001 and the fifth switch sub-circuit 3004.

Therefore, the number of turns of the stator winding 2 communicated to the power supply is changed, the motor 121 can adjust the speed according to loads of different sizes, and the crushing effect is improved.

The first switch sub-circuit 3000 includes a first switch S1 and a first switch control circuit 4, the second switch sub-circuit 3001 includes a second switch S2 and a second control circuit 5, the third switch sub-circuit 3002 includes a third switch S3 and a third switch control circuit 6, the fourth switch sub-circuit 3003 includes a fourth switch S4 and a fourth switch control circuit 7, the fifth switch sub-circuit 3004 includes a fifth switch S5 and a fifth switch control circuit 8, and the sixth switch sub-circuit 3005 includes a sixth switch S6 and a sixth switch control circuit 9. The first switch S1 and the second switch S2 are single-pole single-throw switches, and the third switch S3, the fourth switch S4, the fifth switch S5 and the sixth switch S6 are single-pole double-throw switches.

Fig. 6 is a circuit connection diagram of the plurality of stator windings 2 of the food processor 1 provided by the present application in the first communication state. In some embodiments, in the first connection state, the first stator winding 20 and the second stator winding 21 are connected in series to the first power supply connection L, and the third stator winding 22 and the fourth stator winding 23 are connected in series to the second power supply connection N. In the first connection state, the first stator winding 20 is connected in series with the second stator winding 21, and the third stator winding 22 is connected in series with the fourth stator winding 23, so that the overload capacity of the motor 121 is enhanced, the damage to the motor 121 is reduced, the effect of crushing large granular loads is good, and the service life of the motor 121 is prolonged.

In some embodiments, in the first communication state, the first and second stator windings 20 and 21 connected in series are in communication with the first and second brushes 110 and 111, and the third and fourth stator windings 22 and 23 connected in series are in communication with the third and fourth brushes 112 and 113.

In the first connection state, the first stator winding 20 is connected in series with the second stator winding 21, the first stator winding 20 is connected with the rotor winding 115 through the first brush 110, the second stator winding 21 is connected with the rotor winding 115 through the second brush 111, the third stator winding 22 is connected in series with the fourth stator winding 23, the third stator winding 22 is connected with the rotor winding 115 through the third brush 112, and the fourth stator winding 23 is connected with the rotor winding 115 through the fourth brush 113, so that the overload capacity of the motor 121 is enhanced, the damage to the motor 121 is reduced, the effect of crushing large granular loads is good, and the service life of the motor 121 is prolonged.

The movable contact a of the third switch S3 communicates with the stationary contact b, the movable contact a of the fourth switch S4 communicates with the stationary contact b, the first switch S1 is closed, and the movable contact a of the fifth switch S5 communicates with the stationary contact b, the movable contact a of the sixth switch S6 communicates with the stationary contact b, the second switch S1 is closed, so that the first stator winding 20 and the second stator winding 21 are connected in series to the first power connection terminal L, and the third stator winding 22 and the fourth stator winding 23 are connected in series to the second power connection terminal N.

Fig. 7 is a circuit wiring diagram of the plurality of stator windings 2 of the food processor 1 provided by the present application in the second communication state. In the second connection state, one of the first stator winding 20 and the second stator winding 21 is connected to the first power supply connection terminal L and the other is disconnected from the first power supply connection terminal L, and one of the third stator winding 22 and the fourth stator winding 23 is connected to the second power supply connection terminal and the other is disconnected from the second power supply connection terminal. In the second communication state, the first stator winding 20 and the third stator winding 22 are conducted, or the second stator winding 21 and the fourth stator winding 23 are conducted, so that the rotating speed of the motor 121 is increased when the motor 121 crushes small granular loads or the motor 121 is in no-load, or the rotating speed of the motor 121 is decreased when the motor 121 crushes large granular loads, and the crushing effect is improved.

In the second communication state, one of the first stator winding 20 and the second stator winding 21 communicates with one of the first brush 110 and the second brush 111, and one of the third stator winding 22 and the fourth stator winding 23 communicates with one of the third brush 112 and the fourth brush 113.

In the second communication state, the first brush 110 is used for communicating the first stator winding 20 with the rotor winding 115, the third brush 112 is used for communicating the third stator winding 22 with the rotor winding 115, or the second brush 111 is used for communicating the second stator winding 21 with the rotor winding 115, and the fourth brush 113 is used for communicating the fourth stator winding 23 with the rotor winding 115, so that when the motor 121 crushes small granular loads or the motor 121 is in no-load, the rotating speed of the motor 121 is increased, and when the motor 121 crushes large granular loads, the rotating speed of the motor 121 is reduced, and the crushing effect is improved.

The movable contact a of the third switch S3 communicates with the stationary contact c, the movable contact a of the fourth switch S4 communicates with the stationary contact b, the first switch S1 is closed, and the movable contact a of the fifth switch S5 communicates with the stationary contact b, the movable contact a of the sixth switch S6 communicates with the stationary contact b, the second switch S1 is closed, so that one of the first stator winding 20 and the second stator winding 21 communicates with the first power connection terminal L, and one of the third stator winding 22 and the fourth stator winding 23 communicates with the second power connection terminal N.

Fig. 8 is a circuit wiring diagram of the plurality of stator windings 2 of the food processor 1 provided by the present application in the third communication state.

In the third communication state, the first stator winding 20 and the second stator winding 21 are connected in parallel and communicate with the first power supply connection terminal L, and the third stator winding 22 and the fourth stator winding 23 are connected in parallel and communicate with the second power supply connection terminal N. In the third communication state, the first stator winding 20 and the second stator winding 21 are connected in parallel, the third stator winding 22 and the fourth stator winding 23 are connected in parallel, and the connection mode of the plurality of stator windings 2 is the default connection mode of the motor 121.

In the third communication state, the first stator winding 20 communicates with the first brush 110, the second stator winding 21 communicates with the second brush 111, the third stator winding 22 communicates with the third brush 112, and the fourth stator winding 23 communicates with the fourth brush 113.

In the third communication state, the default motor 121 is connected in such a manner that the first stator winding 20 and the second stator winding 21 are connected in parallel, the first stator winding 20 and the rotor winding 115 are connected through the first brush 110, the second stator winding 21 and the rotor winding 115 are connected through the second brush 111, the third stator winding 22 and the fourth stator winding 23 are connected in series, the third stator winding 22 and the rotor winding 115 are connected through the third brush 112, and the fourth stator winding 23 and the rotor winding 115 are connected through the fourth brush 113.

The movable contact a of the third switch S3 communicates with the stationary contact c, the movable contact a of the fourth switch S4 communicates with the stationary contact c, the first switch S1 is open, and the movable contact a of the fifth switch S5 communicates with the stationary contact c, the movable contact a of the sixth switch S6 communicates with the stationary contact c, the second switch S1 is open, so that the first stator winding 20 and the second stator winding 21 communicate in parallel to the first power connection terminal L, and the third stator winding 22 and the fourth stator winding 23 communicate in parallel to the second power connection terminal N.

In some embodiments, referring to fig. 4 and 5, the switch sub-circuit includes a switch electrically connected to the stator winding 2 and a switch control circuit connected to the switch, and the controller 31 is electrically connected to the switch control circuit, by which the switch is controlled. The switch sub-circuits may be a first switch sub-circuit 3000, a second switch sub-circuit 3001, a third switch sub-circuit 3002, a fourth switch sub-circuit 3003, a fifth switch sub-circuit 3004, a sixth switch sub-circuit 3005. The switches may be the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6 described above. The switch control circuits may be the first switch control circuit 4, the second switch control circuit 5, the third switch control circuit 6, the fourth switch control circuit 7, the fifth switch control circuit 8, the sixth switch control circuit 9 described above. The first switch sub-circuit 3000 will be described as an example.

The first switch sub-circuit 3000 includes a first switch S1 and a first switch control circuit 4. The first switch S1 is connected to the first switch control circuit 4, and the controller 31 is connected to the first switch control circuit 4, so as to control the first switch control circuit 4 to control the on/off of the first switch S1, thereby changing the number of turns of the stator winding 2, expanding the rotation speed range of the motor, adjusting the speed of the motor, and reducing the damage to the motor.

In some embodiments, the switch control circuit 301 comprises a transistor Q, a base of the transistor Q is electrically connected to the controller 31, a collector of the transistor Q is electrically connected to the switch S, the other of the collector and the emitter of the transistor Q is grounded GND, and the controller 31 controls the transistor Q to control the switch. The controller 31 controls the conduction of the triode Q, so that the current in the switch control circuit 301 is amplified, the effect of conducting the switch is good, and the realized circuit has simple structure and low cost.

In some embodiments, the switch control circuit 301 includes a diode D, a first resistor R1, and a second circuit R2. The switch includes a coil and a set of contacts. The diode is arranged at two ends of the coil of the switch S, the cathode of the diode is electrically connected to a power supply terminal VCC, the collector of the triode Q is connected with the anode of the diode D, the emitter of the triode Q is grounded, the base of the triode Q is connected to the drive control port of the controller 31 through the first resistor R1, and the second resistor R2 is connected between the base and the emitter of the triode Q.

It should be noted that the second switch sub-circuit 3001, the third switch sub-circuit 3002, the fourth switch sub-circuit 3003, the fifth switch sub-circuit 3004, and the sixth switch sub-circuit 3005 are similar to the first switch sub-circuit 3000, and a switch control circuit included in each switch sub-circuit is also similar, so detailed description is omitted here.

In some embodiments, the motor speed control circuit 3 further includes a power circuit 90 electrically connected to the first power connection terminal L and the second power connection terminal N for converting the voltage of the power source into the operating voltage of the controller 31. The voltage of the larger power supply can be converted to a lower voltage by the power supply circuit 90 to be suitable for the operating voltage of the controller 31. In some embodiments, the voltage of the power supply is a 220V mains voltage.

In some embodiments, the motor speed control circuit 3 further includes a motor driving circuit 91, a rotation speed detection circuit 92, and a current detection circuit 93. The rotational speed of the motor 121 is regulated by the motor driving circuit 91, the rotational speed detecting circuit 92 detects the rotational speed of the motor 121, and the current detecting circuit 91 detects the operating current of the motor 121, so that the controller 31 controls the plurality of stator windings 2 to switch between the plurality of communicating states. In some embodiments, the motor driving circuit 91 may be a thyristor driving circuit, and the rotation speed detecting circuit 92 may be a hall tachometer circuit.

The technical solutions disclosed in the embodiments of the present application can complement each other without generating conflicts.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. The utility model provides a motor speed governing circuit of cooking machine which characterized in that includes:

a first power connection terminal and a second power connection terminal;

an electric machine (121) comprising a plurality of stator windings (2), the plurality of stator windings (2) comprising a first stator winding (20), a second stator winding (21), a third stator winding (22), and a fourth stator winding (23), the plurality of stator windings (2) comprising a plurality of communication states, the first stator winding (20), the second stator winding (21), the third stator winding (22), and the fourth stator winding (23) being in different electrical communication loops with the first power connection end and the second power connection end in different communication states;

a switching circuit (30) electrically connected to the plurality of stator windings (2); and

and a controller (31) connected to the switching circuit (30), and controlling the switching circuit (30) to switch the stator winding (2) between the plurality of communication states, thereby controlling the rotational speed of the motor (121).

2. The motor speed regulation circuit of claim 1, wherein the switching circuit (30) comprises a plurality of switch sub-circuits (300) electrically connected to the first stator winding (20), the second stator winding (21), the third stator winding (22), and the fourth stator winding (23);

the plurality of stator windings (2) comprise a first communication state, a second communication state and a third communication state, the controller (31) is electrically connected with the plurality of switch sub-circuits (300), and the plurality of switch sub-circuits (300) are controlled to switch the stator windings (2) among the first communication state, the second communication state and the third communication state;

in the first connection state, the first stator winding (20) and the second stator winding (21) are connected in series to the first power supply connection, and the third stator winding (22) and the fourth stator winding (23) are connected in series to the second power supply connection;

in the second connection state, one of the first stator winding (20) and the second stator winding (21) is connected to the first power connection terminal and the other is disconnected from the first power connection terminal, and one of the third stator winding (22) and the fourth stator winding (23) is connected to the second power connection terminal and the other is disconnected from the second power connection terminal;

in the third communication state, the first stator winding (20) and the second stator winding (21) are connected in parallel and communicated with the first power connection terminal, and the third stator winding (22) and the fourth stator winding (23) are connected in parallel and communicated with the second power connection terminal.

3. The motor speed regulation circuit of claim 2, wherein the motor comprises a first brush (110), a second brush (111), a third brush (112), and a fourth brush (113); the plurality of switch sub-circuits (300) includes a first switch sub-circuit (3000) and a second switch sub-circuit (3001), the first switch sub-circuit (3000) is electrically connected between the first brush (110) and the second brush (111), and the second switch sub-circuit (3001) is electrically connected between the third brush (112) and the fourth brush (113);

in the first communication state, the first stator winding (20) and the second stator winding (21) connected in series communicate with the first brush (110) and the second brush (111);

in the second communication state, one of the first stator winding (20) and the second stator winding (21) communicates with one of the first brush (110) and the second brush (111), and one of the third stator winding (22) and the fourth stator winding (23) communicates with one of the third brush (112) and the fourth brush (113);

in the third communication state, the first stator winding (20) communicates with the first brush (110), the second stator winding (21) communicates with the second brush (111), the third stator winding (22) communicates with the third brush (112), and the fourth stator winding (23) communicates with the fourth brush (113).

4. The motor speed regulation circuit of claim 3, wherein the plurality of switch subcircuits (300) comprises:

a third switching sub-circuit (3002) electrically connected to the first power connection terminal, the first stator winding (20), and the second stator winding (21) to switch the first power connection terminal between the first stator winding (20) and the second stator winding (21); and

a fourth switch sub-circuit (3003) electrically connected to the second stator winding (21), the first switch sub-circuit (3000), and the third switch sub-circuit (3002) to switch the second stator winding (21) between the first switch sub-circuit (3000) and the third switch sub-circuit (3002).

5. A motor speed regulation circuit according to claim 3 or 4, characterized in that the plurality of switch sub-circuits (300) comprises:

a fifth switch sub-circuit (3004) electrically connected to said second power connection terminal (N), said third stator winding (22) and said fourth stator winding (23) for switching said second power connection terminal (N) between said third stator winding (22) and said fourth stator winding (23); and

and a sixth switch sub-circuit (3005) electrically connected to the fourth stator winding (23), the second switch sub-circuit (3001), and the fifth switch sub-circuit (3004) to switch the fourth stator winding (23) between the second switch sub-circuit (3001) and the fifth switch sub-circuit (3004).

6. A motor speed regulation circuit according to claim 2, characterized in that the switch sub-circuit (300) comprises a switch and a switch control circuit (301), the switch being electrically connected to the stator winding (2), the switch control circuit (301) being connected to the switch, the controller (31) being electrically connected to the switch control circuit (301), the switch being controlled by controlling the switch control circuit (301).

7. The motor throttle circuit of claim 6, characterized in that the switch control circuit (301) comprises a transistor, the base of the transistor is electrically connected to the controller (31), one of the collector and emitter of the transistor is electrically connected to the switch, the other of the collector and emitter of the transistor is grounded, and the controller (31) controls the transistor to control the switch.

8. The motor speed regulation circuit of claim 1, further comprising:

a power supply circuit (90) electrically connected to the first power supply connection terminal and the second power supply connection terminal, for converting a voltage of a power supply into a working voltage of the controller (31); and/or

The motor driving circuit is electrically connected to the second power supply connecting end and the controller (31), and the controller (31) controls the motor driving circuit to drive the motor; and/or

A rotation speed detection circuit (91) electrically connected to the controller (31) and detecting the rotation speed of the motor; and/or

And the current detection circuit (92) is electrically connected with the controller (31) and is used for detecting the working current of the motor.

9. The motor speed regulation circuit of claim 1 wherein the motor is a four pole series motor.

10. A food processor, comprising:

a blender cup (10) comprising a blender blade assembly (100); and

the motor speed regulating circuit of the food processor of any one of claims 1 to 9, wherein the motor (121) of the motor speed regulating circuit is connected with the stirring knife assembly (100) to drive the stirring knife assembly (100) to rotate.

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