CN109391214A - Food cooking machine and its constant speed control method and device - Google Patents
Food cooking machine and its constant speed control method and device Download PDFInfo
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- CN109391214A CN109391214A CN201710661644.9A CN201710661644A CN109391214A CN 109391214 A CN109391214 A CN 109391214A CN 201710661644 A CN201710661644 A CN 201710661644A CN 109391214 A CN109391214 A CN 109391214A
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- motor
- speed
- revolving speed
- module
- preset time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/045—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
- A47J43/07—Parts or details, e.g. mixing tools, whipping tools
- A47J43/08—Driving mechanisms
- A47J43/085—Driving mechanisms for machines with tools driven from the lower side
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
The invention discloses a kind of food cooking machine and its constant speed control methods and device, the described method comprises the following steps: detection is input to the zero cross signal of the alternating current of motor；Output unbalanced pulse signal exports a unbalanced pulse signal to silicon controlled module and every the second preset time after zero crossing postpones the first preset time；The level signal of alternation is exported by Hall sensor, and obtain the revolving speed of motor using frequency speed measuring method according to the level signal of alternation when the revolving speed of motor is more than or equal to preset rotation speed, and obtain the revolving speed of motor using period velocimetry when the revolving speed of motor is less than preset rotation speed；The first preset time is adjusted according to the revolving speed of motor to control motor whole process constant-speed operation.This method measures the revolving speed of motor using different methods as a result, and changes the revolving speed of motor by changing the turn-on time of silicon controlled module according to the revolving speed of motor, and not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves cooking effect.
Description
Technical field
The present invention relates to field of home appliance technology, in particular to a kind of constant speed control method of food cooking machine, food
The constant-speed control device of cooking machine and a kind of food cooking machine.
Background technique
In general, food cooking machine is with the operation of power limitation control motor, i.e. the copped wave cut-in voltage of motor is definite value, electricity
Control voltage, power when machine load and zero load are also definite value.
This not only results in energy waste, and motor can be transported in motor under low-speed run state, or even when will appear zero load
The case where row, motor cannot not enough be run because of power when load, influence the cooking effect of food cooking machine.
Summary of the invention
The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, of the invention
First purpose is to propose a kind of constant speed control method of food cooking machine, and this method is using different method measurement motors
Revolving speed, and change according to the revolving speed of motor the revolving speed of motor, not only measurement accuracy by changing the turn-on time of silicon controlled module
Height, and motor whole process constant-speed operation can be made, improve the cooking effect of food cooking machine.
Second object of the present invention is to propose a kind of constant-speed control device of food cooking machine.
Third object of the present invention is to propose a kind of food cooking machine.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of fixed speed control side of food cooking machine
Method, the food cooking machine include motor and the silicon controlled module for driving the motor, and the rotor of the motor is equipped with magnet ring,
The constant speed control method is the following steps are included: detection is input to the zero cross signal of the alternating current of the motor；According to the mistake
Zero-signal obtains the zero crossing of the alternating current, and exports unbalanced pulse signal after the zero crossing postpones the first preset time
A unbalanced pulse signal is exported to the silicon controlled module, with logical to the silicon controlled module and every the second preset time
It crosses the silicon controlled module and drives the motor operation, wherein second preset time is the half period of the alternating current；
The magnetic field that the magnet ring provides is detected by Hall sensor and converts signal to export the level signal of alternation, and in the motor
Revolving speed be more than or equal to preset rotation speed when according to the level signal of the alternation using frequency speed measuring method obtain the motor turn
Speed, and obtained according to the level signal of the alternation using period velocimetry when the revolving speed of the motor is less than preset rotation speed
The revolving speed of the motor；First preset time is adjusted according to the revolving speed of the motor whole to control the motor
Constant-speed operation.
The constant speed control method of food cooking machine according to an embodiment of the present invention, first detection is input to the alternating current of motor
Then zero cross signal obtains the zero crossing of alternating current according to zero cross signal, and exports after zero crossing postpones the first preset time
Unbalanced pulse signal exports a unbalanced pulse signal to silicon controlled module to silicon controlled module and every the second preset time,
To be run by silicon controlled module driving motor, the magnetic field that magnet ring provides then is detected by Hall sensor and converts signal with defeated
The level signal of alternation out uses frequency speed measuring according to the level signal of alternation when the revolving speed of motor is more than or equal to preset rotation speed
Method obtains the revolving speed of motor, and is tested the speed according to the level signal of alternation using the period when the revolving speed of motor is less than preset rotation speed
Method obtains the revolving speed of motor, finally the first preset time is adjusted according to the revolving speed of motor to control motor whole process constant speed fortune
Row.This method measures the revolving speed of motor using different methods as a result, and according to the revolving speed of motor by changing silicon controlled module
Turn-on time change the revolving speed of motor, not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves food
The cooking effect of cooking machine.
In addition, the constant speed control method of the food cooking machine proposed according to that above embodiment of the present invention can also have it is as follows
Additional technical characteristic:
According to one embodiment of present invention, it is default to postpone described first when the rising edge of the crossover point signal arrives
The unbalanced pulse signal is exported after time to the silicon controlled module.
According to one embodiment of present invention, according to the revolving speed of the motor to first preset time be adjusted with
Control the motor whole process constant-speed operation, comprising: judge whether the revolving speed of the motor is greater than rotating speed of target；If the motor
Revolving speed be greater than the rotating speed of target, then increase first preset time, when conducting by reducing the silicon controlled module
Between to reduce the revolving speed of the motor, until the revolving speed of the motor is equal to the rotating speed of target；If the revolving speed of the motor
Less than the rotating speed of target, then reduce first preset time, by increasing the turn-on time of the silicon controlled module to mention
The revolving speed of the high motor, until the revolving speed of the motor is equal to the rotating speed of target.
According to one embodiment of present invention, the series of the magnet ring is even number and is more than or equal to 12 grades.
According to one embodiment of present invention, the electricity is obtained using period velocimetry according to the level signal of the alternation
The revolving speed of machine, comprising: measured by the interval width that timer generates two pulses in the level signal of the alternation；
The interval width and the magnet ring generated according to described two pulses rotates the alternation of the Hall sensor output in one week
Pulse number corresponding to level signal calculates the revolving speed of the motor.
According to one embodiment of present invention, the electricity is obtained using frequency speed measuring method according to the level signal of the alternation
The revolving speed of machine, comprising: obtain arteries and veins corresponding to the level signal of the alternation of the Hall sensor output in third preset time
Rush number；The revolving speed of the motor is calculated according to the third preset time and the pulse number.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of fixed speed control dress of food cooking machine
It sets, comprising: silicon controlled module, the silicon controlled module are used to drive the motor in the food cooking machine；Zero crossing detection module,
The zero crossing detection module is used to detect the zero cross signal for the alternating current for being input to the motor；Rotating speed measring module, described turn
Fast detection module includes the magnet ring being arranged on the rotor and the Hall sensor that is correspondingly arranged with the magnet ring, described
Rotating speed measring module is used to detect the magnetic field that the magnet ring provides by the Hall sensor and converts signal to export alternation
Level signal；Control module, the control module respectively with the silicon controlled module, the zero crossing detection module and the revolving speed
Detection module is connected, and the control module is used to obtain the zero crossing of the alternating current according to the zero cross signal, and described
Output unbalanced pulse signal is to the silicon controlled module and defeated every the second preset time after zero crossing postpones the first preset time
A unbalanced pulse signal is to the silicon controlled module out, to drive the motor operation by the silicon controlled module, and
Institute is obtained using frequency speed measuring method according to the level signal of the alternation when the revolving speed of the motor is more than or equal to preset rotation speed
The revolving speed for stating motor is tested the speed according to the level signal of the alternation using the period when the revolving speed of the motor is less than preset rotation speed
Method obtains the revolving speed of the motor, and first preset time is adjusted described in control according to the revolving speed of the motor
Motor whole process constant-speed operation, wherein second preset time is the half period of the alternating current.
The constant-speed control device of food cooking machine according to an embodiment of the present invention drives food cooking by silicon controlled module
Motor in machine, zero crossing detection module detection are input to the zero cross signal of the alternating current of motor, and Rotating speed measring module passes through Hall
The magnetic field that sensor detection magnet ring provides converts signal to export the level signal of alternation, and control module is obtained according to zero cross signal
The zero crossing of alternating current, and after zero crossing postpones the first preset time output unbalanced pulse signal to silicon controlled module and every
Every the second preset time one unbalanced pulse signal of output to silicon controlled module, to be run by silicon controlled module driving motor,
And motor is obtained using frequency speed measuring method according to the level signal of alternation when the revolving speed of motor is more than or equal to preset rotation speed
Revolving speed obtains turning for motor using period velocimetry according to the level signal of alternation when the revolving speed of motor is less than preset rotation speed
Speed, and the first preset time is adjusted according to the revolving speed of motor to control motor whole process constant-speed operation.The device is adopted as a result,
The revolving speed of motor is measured with different methods, and makes to change by changing the turn-on time of silicon controlled module according to the revolving speed of motor
The revolving speed of motor, not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves the cooking effect of food cooking machine
Fruit.
In addition, the constant-speed control device of the food cooking machine proposed according to that above embodiment of the present invention can also have it is as follows
Additional technical characteristic:
According to one embodiment of present invention, the control module postpones when the rising edge of the crossover point signal arrives
The unbalanced pulse signal is exported after first preset time to the silicon controlled module.
According to one embodiment of present invention, the control module according to the revolving speed of the motor to described first it is default when
Between when being adjusted to control the motor whole process constant-speed operation, be also used to judge whether the revolving speed of the motor turns greater than target
Speed, wherein if the revolving speed of the motor is greater than the rotating speed of target, control module if increase described first it is default when
Between, by reducing the turn-on time of the silicon controlled module to reduce the revolving speed of the motor, until the revolving speed etc. of the motor
In the rotating speed of target；If the revolving speed of the motor is less than the rotating speed of target, control module if, reduces described first
Preset time, by increasing the turn-on time of the silicon controlled module to improve the revolving speed of the motor, until the motor
Revolving speed is equal to the rotating speed of target.
According to one embodiment of present invention, the series of the magnet ring is even number and is more than or equal to 12 grades.
According to one embodiment of present invention, the rotor shaft between motor body and motor blower fan is arranged in the magnet ring
On, perhaps it is arranged on the rotor shaft below the motor blower fan or is arranged in motor mandrel connector and the motor sheet
On rotor shaft between body.
According to one embodiment of present invention, the control module obtains the revolving speed of the motor using period velocimetry
When, it is measured by the interval width that timer generates two pulses in the level signal of the alternation, and according to described
The interval width and the magnet ring that two pulses generate rotate the level signal of the alternation of the Hall sensor output in one week
Corresponding pulse number calculates the revolving speed of the motor.
According to one embodiment of present invention, the control module obtains the revolving speed of the motor using frequency speed measuring method
When, obtain pulse number corresponding to the level signal of the alternation of the Hall sensor output in third preset time, and root
The revolving speed of the motor is calculated according to the third preset time and the pulse number.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of food cooking machine comprising the present invention
The constant-speed control device of food cooking machine described in second aspect embodiment.
The food cooking machine of the embodiment of the present invention, by the constant-speed control device of above-mentioned food cooking machine, using difference
Method measurement motor revolving speed, and according to the revolving speed of motor by change silicon controlled module turn-on time change motor turn
Speed, not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves cooking effect.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 is the flow chart of the constant speed control method of food cooking machine according to an embodiment of the invention；
Fig. 2 is the structural schematic diagram of food cooking machine according to an embodiment of the invention；
Fig. 3 is the schematic diagram of the fixed speed control of food cooking machine according to an embodiment of the invention；
Fig. 4 is detection signal according to an embodiment of the invention and the waveform diagram for controlling signal；
Fig. 5 is the flow chart of the constant speed control method of food cooking machine in accordance with another embodiment of the present invention；
Fig. 6 is the schematic illustration of period velocimetry according to an embodiment of the invention；
Fig. 7 is the schematic illustration of frequency speed measuring method according to an embodiment of the invention；
Fig. 8 is the flow chart of the constant speed control method of the food cooking machine of a specific example according to the present invention；And
Fig. 9 is the block diagram of the constant-speed control device of food cooking machine according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The constant speed control method of food cooking machine of the embodiment of the present invention, food cooking machine described with reference to the accompanying drawing
Constant-speed control device and food cooking machine.
Fig. 1 is the flow chart of the constant speed control method of food cooking machine according to an embodiment of the invention.Wherein, as schemed
Shown in 2, food cooking machine includes the silicon controlled module (not specifically illustrated in figure) of motor and driving motor, is set on the rotor of motor
There is magnet ring；As shown in Figure 1, constant speed control method the following steps are included:
S1, detection are input to the zero cross signal of the alternating current AC of motor.
S2 obtains the zero crossing of alternating current AC according to zero cross signal, and defeated after zero crossing postpones the first preset time T 1
Unbalanced pulse signal exports a unbalanced pulse signal to silicon-controlled mould to silicon controlled module and every the second preset time T 2 out
Block, to be run by silicon controlled module driving motor, wherein the second preset time T 2 is the half period of alternating current AC.
S3 detects the magnetic field that magnet ring provides by Hall sensor and converts signal to export the level signal of alternation, and
Obtain the revolving speed of motor when the revolving speed V of motor is more than or equal to preset rotation speed V1 using frequency speed measuring method according to the level signal of alternation
V, and motor is obtained using period velocimetry according to the level signal of alternation when the revolving speed V of motor is less than preset rotation speed V1
Revolving speed V.Wherein, the first preset rotation speed V1 can be preset according to the actual situation.
Wherein, in an embodiment of the present invention, the series of magnet ring is even number and is more than or equal to 12 grades.
S4 is adjusted the first preset time T 1 according to the revolving speed V of motor to control motor whole process constant-speed operation.
Specifically, as shown in Figure 3 and Figure 4, after motor powers on, INT detection port can generate level change, alternating current AC warp
The square-wave signal i.e. zero cross signal of 50Hz/60Hz or so can be generated by crossing Q1.The zero crossing of alternating current AC is obtained according to zero cross signal,
And after zero crossing postpones the first preset time T 1, using PWM (Pulse Width Modulation, pulse width modulation) skill
Art exports unbalanced pulse signal to silicon controlled module, and silicon controlled module is connected after receiving unbalanced pulse signal, to make electricity
Machine work, and unbalanced pulse signal is exported to silicon controlled module every the T2 time, wherein the second preset time T 2 is equal to exchange
The 1/2 of electric AC period.T2 is definite value, by changing the size of the first preset time T 1, i.e., the conducting of changeable silicon controlled module
Time, to change the revolving speed V of motor.
As shown in Fig. 2, motor includes rotor and stator, magnet ring is fixed on rotor, and Hall sensor is fixed on motor
On shell, when electrical power, coil can generate alternating magnetic field, and rotor is rotated because of the power traction in the magnetic field of alternation.Magnetic
Ring is formed by being magnetic with non-magnetic bulk, when magnetic one side is close to Hall sensor, thus it is possible to vary hall sensing
The level signal of device, when non-magnetic one side is close to Hall sensor, Hall sensor restores initial level signal.Cause
This, as shown in figure 3, the level signal for generating alternation close to its Hall sensor, i.e. port can be caused when magnet ring rotation
SENSOR can generate the level signal of alternation.All may be used according to the level signal of alternation using period velocimetry or frequency speed measuring method
To measure the revolving speed V for measuring motor, but the accuracy of measurement for being different method is related with the revolving speed V of motor, wherein works as motor
When in high speed, the accuracy using the revolving speed of frequency speed measuring method measurement is higher；When motor is in low speed, tested the speed using the period
The accuracy of the revolving speed of method measurement is higher.
For this purpose, in the present invention, when motor has just started starting, the revolving speed V of motor is lower, can basis hall sensing
Device generates the level signal of alternation using the revolving speed V of period velocimetry measurement motor, if V < V1, according to the revolving speed V of motor
Size by changing the first preset time T 1 controls motor constant-speed operation.With the increase of running time, the revolving speed V of motor by
Gradually rise, when V is greater than V1, then the level signal that the Hall sensor of basis generates alternation measures motor using frequency speed measuring method
Revolving speed V, and according to the revolving speed V of motor by change the first preset time T 1 size control motor constant-speed operation.As a result, should
Method measures the revolving speed of motor using different methods, and passes through the turn-on time of change silicon controlled module according to the revolving speed of motor
Change the revolving speed of motor, not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves the material of food cooking machine
Manage effect.
Further, it is opened as shown in figure 4, being exported after postponing the first preset time T 1 when the rising edge of crossover point signal arrives
Pulse signal is opened to silicon controlled module.
It is understood that as shown in figure 3, Q1 there are conducting voltage VT, when the voltage of A point is more than or equal to conducting voltage VT
When, Q1 conducting, when the voltage of A point is less than conducting voltage VT, Q1 cut-off.So the voltage over zero of zero cross signal is not exchange
The electric real zero crossing of AC, there are the delays of Δ t1 time.Therefore, as shown in figure 4, when the rising edge of crossover point signal arrives
After postponing the first preset time T 1, using PWM technology, unbalanced pulse signal is exported to silicon controlled module, silicon controlled module is connecing
It is connected after receiving unbalanced pulse signal, so that motor be made to work, and exports unbalanced pulse signal to silicon-controlled every the T2 time
Module, wherein the second preset time T 2 is equal to the 1/2 of alternating current AC period.
According to one embodiment of present invention, as shown in figure 5, being carried out according to the revolving speed V of motor to the first preset time T 1
It adjusts to control motor whole process constant-speed operation, may include:
S401, judges whether the revolving speed V of motor is greater than rotating speed of target Vset.Wherein, rotating speed of target VsetIt can be according to reality
Situation is preset.Fast VsetIt can be preset according to the actual situation.
S402, if the revolving speed V of motor is greater than rotating speed of target Vset, then increase the first preset time T 1, it is controllable by reducing
The turn-on time of silicon module is to reduce the revolving speed V of motor, until the revolving speed V of motor is equal to rotating speed of target Vset。
S403, if the revolving speed V of motor is less than rotating speed of target Vset, then reduce the first preset time T 1, it is controllable by increasing
The turn-on time of silicon module is to improve the revolving speed V of motor, until the revolving speed V of motor is equal to rotating speed of target Vset。
Specifically, after calculating the revolving speed V of motor according to period velocimetry or frequency speed measuring method, judge whether V is big
In VsetIf V > Vset, illustrate the revolving speed V higher of motor at this time, can be reduced by being gradually increased the first preset time T 1
The turn-on time of silicon controlled module, so that the revolving speed V of motor is reduced, until V=Vset.If V < Vset, illustrate motor at this time
Revolving speed V is lower, can increase the turn-on time of silicon controlled module, to increase electricity by gradually decreasing the first preset time T 1
The revolving speed V of machine, until V=Vset.And if V=Vset, it is constant that the first preset time T 1 is maintained at current size.Thus, it is possible to
Control motor whole process constant-speed operation.
In an embodiment of the present invention, the revolving speed V of motor, packet are obtained using period velocimetry according to the level signal of alternation
It includes: being measured by the interval width Tx that timer generates two pulses in the level signal of alternation；According to two pulses
The interval width Tx and magnet ring of generation rotate pulse corresponding to the level signal of the alternation of one week Hall sensor output
Number N calculates the revolving speed V of motor.
Specifically, as shown in fig. 6, the revolving speed V=60/PTx of motor, wherein Tx is two in the level signal of alternation
The interval width that pulse generates, P are the number of pole-pairs of motor, shown by detecting that Tx can calculate electricity since P is known quantity
The revolving speed V of machine.Tx can be measured by timer and counter, can start timer according to the level signal of alternation, simultaneously
Control impulse generator generates reference clock pulse S, number N of the counter to the reference clock pulse S generated in Tx in Tx
It is counted, wherein the frequency of reference clock pulse S is fc, according to N and fcTx, Tx=N/f can be calculatedc.Therefore, according to
Following formula (1) can calculate the revolving speed V of motor.
V=60fc/ PN, (1)
Wherein, V is the revolving speed of motor, and P is the number of pole-pairs of motor, fcFor the frequency of benchmark clock pulses S, N is to produce in Tx
The number of raw reference clock pulse S.
It is understood that error mainly has two aspects, first is that two in the level signal of alternation due to there are measurement error
The rising edge triggered time of a pulse may be inconsistent；It is likely to be out of synchronization second is that counting with timer starting and closing.Therefore, it is
Measurement accuracy is improved, measurement error is reduced, it is desirable that the rising edge (or failing edge) of two pulses in the level signal of alternation triggers
Time consistency, it is synchronous with closing with timer starting with counting.When the revolving speed V of motor is lower, two in the level signal of alternation
The interval width Tx that a pulse generates is larger, is easier to rising edge (or the decline of two pulses in the level signal of control alternation
Edge) triggered time is consistent, and is easier to that control counts and timer starting is synchronous with closing, and measurement accuracy is higher.In other words,
The accuracy of measurement of above-mentioned cycle measurement method is reduced with the increase of revolving speed, is suitble to low speed measurement.And the embodiment of the present invention
Food cooking machine constant speed control method, be motor revolving speed V be less than preset rotation speed V1 when, i.e. the revolving speed V of motor is lower
Shi Caiyong period velocimetry measures the revolving speed V of motor, and accuracy of measurement is higher, adjusts further according to V to the first preset time T 1
Section, so as to reliably control motor constant-speed operation.
In an embodiment of the present invention, the revolving speed V of motor, packet are obtained using frequency speed measuring method according to the level signal of alternation
It includes: obtaining pulse number corresponding to the level signal of the alternation of Hall sensor output in third preset time T 3；According to
Three preset time Ts 3 and pulse number calculate the revolving speed V of motor.Wherein, T3 can be preset according to the actual situation.
Specifically, as shown in fig. 7, obtaining the level signal of the alternation of Hall sensor output in the T3 time, can pass through
The revolving speed V of following formula (1) calculating motor:
The π of V=60 ω/2, (1)
Wherein, V is the revolving speed of motor, the angular speed of ω rotor shaft.
Therefore, as long as the revolving speed V of motor can be calculated by obtaining ω.And the π N/T3 of ω=2, N are that pulse is generated in the T3 time
Number.
It brings the π of ω=2 N/T3 into formula (1), obtains following formula (2):
V=60N/T3 (2)
Wherein, V is the revolving speed of motor, and N is the number that pulse is generated in the T3 time.
Therefore, by win the third place preset time T 3 and in the T3 time generate pulse number N, can be counted according to formula (2)
Calculate the revolving speed V of motor.Wherein T3 and N can be obtained by timer and counter.
It is appreciated that being likely to be out of synchronization due to counting with timer starting and closing, and interior possible nothing when detecting
Method measures the pulse complete period, so it is possible to which the error of 1 pulse can be generated.Therefore, it to improve accuracy of measurement, detects
Time be generally arranged it is longer, to improve accuracy of measurement.And pulse number is counted in defined detection time, although inspection
The survey time is certain, but the beginning and ending time detected has randomness.When the revolving speed of measured object is higher, above-mentioned frequency speed measuring method
Accuracy of measurement is higher, and accuracy of measurement is reduced with the reduction of revolving speed.Therefore, above-mentioned frequency speed measuring method is suitble to high speed to survey
Amount, and the constant speed control method of the food cooking machine of the embodiment of the present invention are to be more than or equal to preset rotation speed V1 in the revolving speed V of motor
When, i.e. using the revolving speed V of frequency speed measuring method measurement motor when the revolving speed V higher of motor, accuracy of measurement is higher, further according to V pairs
First preset time T 1 is adjusted, so as to reliably control motor constant-speed operation.
To make those skilled in the art be clearer to understand the present invention, Fig. 8 is the food of a specific example according to the present invention
The flow chart of the constant speed control method of cooking machine.As shown in figure 8, this method may comprise steps of:
S101 starts.
S102, food cooking machine power on.
S103, user's operation food cooking machine, to issue user instruction.
S104 detects the zero crossing that the zero cross signal that port generates obtains alternating current AC according to INT.
S105 exports unbalanced pulse signal extremely after postponing the first preset time T 1 when the rising edge of crossover point signal arrives
Silicon controlled module, and a unbalanced pulse signal is exported to silicon controlled module every the second preset time T 2.
S106 using cycle measurement method or the revolving speed V of frequency measurement measurement current motor, and judges whether V >=V1.
If so, thening follow the steps S107；S108 is thened follow the steps if not.
S107 measures the revolving speed V of motor by frequency measurement.
S108 measures the revolving speed V of motor by cycle measurement method.
S109 judges whether there is V=Vset.If it is, return step S105；If not, thening follow the steps S110.
S110 judges whether there is V > Vset.If so, thening follow the steps S111；If not, thening follow the steps S112.
S111 is gradually increased the first preset time T 1, until V=Vset。
S112 gradually decreases the first preset time T 1, until V=Vset。
In conclusion the constant speed control method of food cooking machine according to an embodiment of the present invention, first detection is input to motor
Alternating current zero cross signal, the zero crossing of alternating current is then obtained according to zero cross signal, and default in zero crossing delay first
Unbalanced pulse signal is exported after time extremely may be used to silicon controlled module and every the second preset time one unbalanced pulse signal of output
Silicon module is controlled, to be run by silicon controlled module driving motor, the magnetic field that magnet ring provides then is detected by Hall sensor and is become
Signal is changed to export the level signal of alternation, is adopted when the revolving speed of motor is more than or equal to preset rotation speed according to the level signal of alternation
The revolving speed of motor is obtained with frequency speed measuring method, and is adopted when the revolving speed of motor is less than preset rotation speed according to the level signal of alternation
The revolving speed that motor is obtained with period velocimetry, is finally adjusted to control motor the first preset time according to the revolving speed of motor
Whole constant-speed operation.This method measures the revolving speed of motor using different methods as a result, and passes through change according to the revolving speed of motor
The turn-on time of silicon controlled module changes the revolving speed of motor, and not only measurement accuracy is high, and can make motor whole process constant-speed operation,
Improve cooking effect.
Fig. 9 is the block diagram of the constant-speed control device of food cooking machine according to an embodiment of the invention.Such as Fig. 9
Shown, which includes: silicon controlled module 10, zero crossing detection module 20, Rotating speed measring module 30 and control module 40.
Wherein, silicon controlled module 10 is used to drive the motor 50 in food cooking machine.Zero crossing detection module 20 is for detecting
It is input to the zero cross signal of the alternating current of motor 50.Rotating speed measring module 30 includes the magnet ring and and magnetic being arranged on rotor
The Hall sensor that ring is correspondingly arranged, Rotating speed measring module 30 are used to detect the magnetic field that magnet ring provides by Hall sensor and convert
Signal is to export the level signal of alternation.Control module 40 is examined with silicon controlled module 10, zero crossing detection module 20 and revolving speed respectively
It surveys module 30 to be connected, control module 40 is used to obtain the zero crossing of alternating current AC according to zero cross signal, and in zero crossing delay the
Unbalanced pulse signal is exported after one preset time T 1 exports a unlatching to silicon controlled module 10 and every the second preset time T 2
Pulse signal is to silicon controlled module 10, to be greater than by the operation of 10 driving motor 50 of silicon controlled module, and in the revolving speed V of motor
The revolving speed V for obtaining motor when equal to preset rotation speed V1 using frequency speed measuring method according to the level signal of alternation, in the revolving speed V of motor
Obtain the revolving speed V of motor when less than preset rotation speed V1 using period velocimetry according to the level signal of alternation, and according to motor
Revolving speed V is adjusted the first preset time T 1 to control motor whole process constant-speed operation, wherein the second preset time T 2 is exchange
The half period of electric AC.Wherein, the first preset time T 1, the first preset rotation speed V1 can be preset according to the actual situation.
In an embodiment of the present invention, as shown in Fig. 2, magnet ring 302 is arranged between motor body and motor blower fan 501
On rotor shaft 502, perhaps it is arranged on the rotor shaft 502 below motor blower fan 501 or is arranged in motor mandrel connector
On rotor shaft 502 between 503 and motor body.
Specifically, as shown in figure 3, alternating current AC can may include for the voltage of 0~200V out, zero passage detection unit 20
The first transistor Q1, control module 40 include two detection port SENSOR and INT and control port PWM, control module
40 detect zero cross signal by port INT, and the level signal of alternation is detected by port SENSOR, can by port PWM control
Control the ON/OFF of silicon module 10.Further, as shown in figure 3, above-mentioned constant-speed control device can also include filter module
60, switch power module 70, Voltage stabilizing module 80, second transistor Q2, power supply VCC, the first to the 5th resistance R1-R5 and two
Pole pipe D1 etc., details are not described herein again as shown in Figure 3 for specific connection type.After motor 50 powers on, INT detection port can generate level
Variation, alternating current AC can generate the square-wave signal i.e. zero cross signal of 50Hz/60Hz or so by Q1.Control module 40 is according to zero passage
The zero crossing of signal acquisition alternating current AC.Control module 40 is controlled using PWM, after zero crossing postpones the first preset time T 1,
Unbalanced pulse signal is exported to silicon controlled module 10 by second transistor Q2, and silicon controlled module 10 is receiving unbalanced pulse letter
It is connected after number, to make motor 50 work, also, control module 40 exports unbalanced pulse signal to silicon-controlled mould every the T2 time
Block 10, wherein the second preset time T 2 is equal to the 1/2 of alternating current AC period.Since T2 is definite value, so control module 40 passes through
Change the size of the first preset time T 1, i.e., the turn-on time of changeable silicon controlled module 10, to change the revolving speed V of motor.
As shown in Fig. 2, magnet ring 302 is fixed on rotor shaft 502, Hall sensor 301 can be fixed on motor 50
On shell, when motor 50 is powered, coil can generate alternating magnetic field, and rotor is revolved because of the power traction in the magnetic field of alternation
Turn.Magnet ring 302 is formed by being magnetic with non-magnetic bulk, when magnetic one side is close to Hall sensor 301, Ke Yigai
The level signal for becoming Hall sensor 301, when non-magnetic one side is close to Hall sensor 301, Hall sensor 301 restores
Initial level signal.Therefore, as shown in figure 3, when magnet ring 302 rotates, the Hall sensor 301 close to it can be caused to generate
The level signal of alternation, i.e. port SENSOR can generate the level signal of alternation.Control module 40 is according to the level signal of alternation
The revolving speed V for measuring motor can be measured using period velocimetry or frequency speed measuring method, but the measurement for being different method is quasi-
Exactness is related with the revolving speed V of motor, wherein when motor 50 is in high speed, using frequency speed measuring method measurement revolving speed it is accurate
It spends higher；When motor 50 is in low speed, the accuracy using the revolving speed of period velocimetry measurement is higher.
For this purpose, in the present invention, when motor 50 has just started starting, the revolving speed V of motor 50 is lower, and control module 40 can be with
According to Hall sensor 301 generate alternation level signal using period velocimetry measurement motor revolving speed V, if V < V1,
Then control module then passes through the size control motor constant-speed operation for changing the first preset time T 1.With the increase of running time,
The revolving speed V of motor is gradually increasing, and when V is greater than V1, then the Hall sensor 301 of 40 basis of control module generates the level of alternation
Signal measures the revolving speed V of motor using frequency speed measuring method, and according to the revolving speed V of motor by changing the big of the first preset time T 1
Small 50 constant-speed operation of control motor.The device measures the revolving speed of motor using different methods as a result, and according to the revolving speed of motor
Turn-on time by changing silicon controlled module changes the revolving speed of motor, and not only measurement accuracy is high, and motor can be made whole
Constant-speed operation improves the cooking effect of food cooking machine.
Further, in an embodiment of the present invention, control module 40 postpones when the rising edge of crossover point signal arrives
Unbalanced pulse signal is exported after first preset time T 1 to silicon controlled module 10.
It is understood that as shown in figure 3, because the first transistor Q1 has conducting voltage VT, when the voltage of A point is greater than
When equal to conducting voltage VT, Q1 conducting, when the voltage of A point is less than conducting voltage VT, Q1 cut-off.So the electricity of zero cross signal
Pressing through zero point not is the real zero crossing of alternating current AC, and there are the delays of Δ t1 time.Therefore, as shown in figure 4, believing in zero crossing
Number rising edge arrive when postpone the first preset time T 1 after, control module 40 use PWM technology, output unbalanced pulse signal extremely
Silicon controlled module 10, silicon controlled module 10 are connected after receiving unbalanced pulse signal, so that motor 50 is made to work, and every
The T2 time exports unbalanced pulse signal to silicon controlled module 10, wherein the second preset time T 2 is equal to the 1/ of alternating current AC period
2。
It should be noted that in an embodiment of the present invention, the series of magnet ring 302 is even number and is more than or equal to 12 grades.
According to one embodiment of present invention, control module 40 carries out the first preset time T 1 according to the revolving speed V of motor
When adjusting to control 50 whole process constant-speed operation of motor, it is also used to judge whether the revolving speed V of motor is greater than rotating speed of target Vset, wherein
If the revolving speed V of motor is greater than rotating speed of target Vset, control module 40 then increases the first preset time T 1, silicon-controlled by reducing
The turn-on time of module 10 is to reduce the revolving speed V of motor 50, until the revolving speed V of motor is equal to rotating speed of target Vset；If motor
Revolving speed V is less than rotating speed of target Vset, control module 40 then reduces the first preset time T 1, by increasing leading for silicon controlled module 10
Lead to the time to improve the revolving speed V of motor, until the revolving speed V of motor is equal to rotating speed of target Vset。
Specifically, control module 40 is sentenced after calculating the revolving speed V of motor according to period velocimetry or frequency speed measuring method
Whether disconnected V is greater than VsetIf V > Vset, illustrate the revolving speed V higher of motor at this time, control module 40 can be by being gradually increased
First preset time T 1, reduces the turn-on time of silicon controlled module 10, so that the revolving speed V of motor is reduced, until V=Vset.If
V < Vset, illustrate that the revolving speed V of motor at this time is lower, control module 40 can increase by gradually decreasing the first preset time T 1
The turn-on time of silicon controlled module 10, to increase the revolving speed V of motor, until V=Vset.And if V=Vset, control module 40
Controlling the first preset time T 1, to be maintained at current size constant.Motor whole process constant-speed operation is controlled as a result,.
In an embodiment of the present invention, when control module 40 obtains the revolving speed V of motor using period velocimetry, pass through timing
The interval width Tx that device generates two pulses in the level signal of alternation is measured, and the interval generated according to two pulses
Width Tx and magnet ring rotate pulse number N corresponding to the level signal of the alternation of one week Hall sensor 301 output and calculate
The revolving speed V of motor.
Specifically, as shown in fig. 6, the revolving speed V=60/PTx of motor, wherein Tx is two in the level signal of alternation
The interval width that pulse generates, P are the number of pole-pairs of motor, shown by detecting that Tx can calculate electricity since P is known quantity
The revolving speed V of machine.Tx can be measured by timer and counter, and control module 40 starts timing according to the level signal of alternation
Device, while controlling impulse generator and generating reference clock pulse S in Tx, counter is to the reference clock pulse S generated in Tx
Number N counted, wherein the frequency of reference clock pulse S be fc, according to N and fcTx, Tx=N/f can be calculatedc.Cause
This, control module 40 can calculate the revolving speed V of motor according to the following formula (1).
V=60fc/ PN, (1)
Wherein, V is the revolving speed of motor, and P is the number of pole-pairs of motor, fcFor the frequency of benchmark clock pulses S, N is to produce in Tx
The number of raw reference clock pulse S.
It is understood that error mainly has two aspects, first is that two in the level signal of alternation due to there are measurement error
The rising edge triggered time of a pulse may be inconsistent；It is likely to be out of synchronization second is that counting with timer starting and closing.Therefore, it is
Measurement accuracy is improved, measurement error is reduced, it is desirable that the rising edge (or failing edge) of two pulses in the level signal of alternation triggers
Time consistency, it is synchronous with closing with timer starting with counting.When the revolving speed V of motor is lower, two in the level signal of alternation
The interval width Tx that a pulse generates is larger, is easier to rising edge (or the decline of two pulses in the level signal of control alternation
Edge) triggered time is consistent, and is easier to that control counts and timer starting is synchronous with closing, and measurement accuracy is higher.In other words,
The accuracy of measurement of above-mentioned cycle measurement method is reduced with the increase of revolving speed, is suitble to low speed measurement.And the embodiment of the present invention
Food cooking machine constant-speed control device, be motor revolving speed V be less than preset rotation speed V1 when, i.e. the revolving speed V of motor is lower
Shi Caiyong period velocimetry measures the revolving speed V of motor, and accuracy of measurement is higher, adjusts further according to V to the first preset time T 1
Section, so as to reliably control motor constant-speed operation.
In an embodiment of the present invention, when control module 40 obtains the revolving speed V of motor using frequency speed measuring method, third is obtained
Pulse number N corresponding to the level signal for the alternation that Hall sensor 301 exports in preset time T 3, and it is default according to third
Time T3 and pulse number N calculates the revolving speed V of motor.
Specifically, as shown in fig. 7, control module 40 obtains the level for the alternation that Hall sensor 301 exports in the T3 time
Signal can calculate the revolving speed V of motor by following formula (1):
The π of V=60 ω/2, (1)
Wherein, V is the revolving speed of motor, the angular speed of ω rotor shaft.
Therefore, as long as the revolving speed V of motor can be calculated by obtaining ω control module 40.And the π N/T3 of ω=2, N are the T3 time
The interior number for generating pulse.
It brings the π of ω=2 N/T3 into formula (1), obtains following formula (2):
V=60N/T3 (2)
Wherein, V is the revolving speed of motor, and N is the number that pulse is generated in the T3 time.
Therefore, it by obtaining third preset time T 3 and generating the number N of pulse in the T3 time, is controlled according to formula (2)
Module 40 can calculate the revolving speed V of motor.Wherein T3 and N can be obtained by timer and counter.
It is appreciated that being likely to be out of synchronization due to counting with timer starting and closing, and interior possible nothing when detecting
Method measures the pulse complete period, so it is possible to which the error of 1 pulse can be generated.Therefore, it to improve accuracy of measurement, detects
Time be generally arranged it is longer, to improve accuracy of measurement.And pulse number is counted in defined detection time, although inspection
The survey time is certain, but the beginning and ending time detected has randomness.When the revolving speed of measured object is higher, above-mentioned frequency speed measuring method
Accuracy of measurement is higher, and accuracy of measurement is reduced with the reduction of revolving speed.Therefore, above-mentioned frequency speed measuring method is suitble to high speed to survey
Amount, and the constant-speed control device of the food cooking machine of the embodiment of the present invention are to be more than or equal to preset rotation speed V1 in the revolving speed V of motor
When, i.e. using the revolving speed V of frequency speed measuring method measurement motor when the revolving speed V higher of motor, accuracy of measurement is higher, further according to V pairs
First preset time T 1 is adjusted, so as to reliably control motor high speed constant-speed operation.
In conclusion the constant-speed control device of food cooking machine according to an embodiment of the present invention, is driven by silicon controlled module
Motor in dynamic food cooking machine, zero crossing detection module detection are input to the zero cross signal of the alternating current of motor, Rotating speed measring mould
Block detects the magnetic field that magnet ring provides by Hall sensor and converts signal to export the level signal of alternation, and control module is according to mistake
Zero-signal obtains the zero crossing of alternating current, and after zero crossing postpones the first preset time output unbalanced pulse signal to silicon-controlled
Module and a unbalanced pulse signal is exported to silicon controlled module, to pass through silicon controlled module driving every the second preset time
Motor operation, and obtained according to the level signal of alternation using frequency speed measuring method when the revolving speed of motor is more than or equal to preset rotation speed
The revolving speed for taking motor obtains electricity using period velocimetry according to the level signal of alternation when the revolving speed of motor is less than preset rotation speed
The revolving speed of machine, and the first preset time is adjusted according to the revolving speed of motor to control motor whole process constant-speed operation.As a result, should
Device measures the revolving speed of motor using different methods, and passes through the turn-on time of change silicon controlled module according to the revolving speed of motor
Make the revolving speed for changing motor, not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves cooking effect.
In addition, the embodiment of the present invention also proposes a kind of food cooking machine comprising the constant speed control of above-mentioned food cooking machine
Device processed.
The food cooking machine of the embodiment of the present invention, by the constant-speed control device of above-mentioned food cooking machine, using difference
Method measurement motor revolving speed, and according to the revolving speed of motor by change silicon controlled module turn-on time change motor turn
Speed, not only measurement accuracy is high, and can make motor whole process constant-speed operation, improves cooking effect.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (14)
1. a kind of constant speed control method of food cooking machine, which is characterized in that the food cooking machine includes motor and driving institute
State the silicon controlled module of motor, the rotor of the motor is equipped with magnet ring, the constant speed control method the following steps are included:
Detection is input to the zero cross signal of the alternating current of the motor；
The zero crossing of the alternating current is obtained according to the zero cross signal, and defeated after the zero crossing postpones the first preset time
Out unbalanced pulse signal to the silicon controlled module and every the second preset time export a unbalanced pulse signal to it is described can
Silicon module is controlled, to drive the motor operation by the silicon controlled module, wherein second preset time is the exchange
The half period of electricity；
The magnetic field that the magnet ring provides is detected by Hall sensor and converts signal to export the level signal of alternation, and described
The motor is obtained using frequency speed measuring method according to the level signal of the alternation when revolving speed of motor is more than or equal to preset rotation speed
Revolving speed, and the motor revolving speed be less than preset rotation speed when according to the level signal of the alternation use period velocimetry
Obtain the revolving speed of the motor；
First preset time is adjusted according to the revolving speed of the motor to control the motor whole process constant-speed operation.
2. the constant speed control method of food cooking machine as described in claim 1, which is characterized in that in the crossover point signal
Rising edge exports the unbalanced pulse signal to the silicon controlled module after postponing first preset time when arriving.
3. the constant speed control method of food cooking machine as claimed in claim 1 or 2, which is characterized in that according to the motor
Revolving speed is adjusted first preset time to control the motor whole process constant-speed operation, comprising:
Judge whether the revolving speed of the motor is greater than rotating speed of target；
If the revolving speed of the motor be greater than the rotating speed of target, increase first preset time, by reduce described in can
The turn-on time of silicon module is controlled to reduce the revolving speed of the motor, until the revolving speed of the motor is equal to the rotating speed of target；
If the revolving speed of the motor be less than the rotating speed of target, reduce first preset time, by increase described in can
The turn-on time of silicon module is controlled to improve the revolving speed of the motor, until the revolving speed of the motor is equal to the rotating speed of target.
4. the constant speed control method of food cooking machine as described in claim 1, which is characterized in that the series of the magnet ring is even
It counts and is more than or equal to 12 grades.
5. the constant speed control method of food cooking machine as described in claim 1, which is characterized in that according to the level of the alternation
Signal obtains the revolving speed of the motor using period velocimetry, comprising:
It is measured by the interval width that timer generates two pulses in the level signal of the alternation；
The interval width and the magnet ring generated according to described two pulses rotates the friendship of the Hall sensor output in one week
Pulse number corresponding to the level signal of change calculates the revolving speed of the motor.
6. the constant speed control method of food cooking machine as described in claim 1, which is characterized in that according to the level of the alternation
Signal obtains the revolving speed of the motor using frequency speed measuring method, comprising:
Obtain pulse number corresponding to the level signal of the alternation of the Hall sensor output in third preset time；
The revolving speed of the motor is calculated according to the third preset time and the pulse number.
7. a kind of constant-speed control device of food cooking machine characterized by comprising
Silicon controlled module, the silicon controlled module are used to drive the motor in the food cooking machine；
Zero crossing detection module, the zero crossing detection module are used to detect the zero cross signal for the alternating current for being input to the motor；
Rotating speed measring module, the Rotating speed measring module include the magnet ring being arranged on the rotor and with the magnet ring pair
The Hall sensor that should be arranged, the Rotating speed measring module are used to detect the magnetic that the magnet ring provides by the Hall sensor
Field transformation signal is to export the level signal of alternation；
Control module, the control module respectively with the silicon controlled module, the zero crossing detection module and the Rotating speed measring
Module is connected, and the control module is used to obtain the zero crossing of the alternating current according to the zero cross signal, and in the zero passage
Output unbalanced pulse signal exports one to the silicon controlled module and every the second preset time after point the first preset time of delay
A unbalanced pulse signal is to the silicon controlled module, to drive the motor operation by the silicon controlled module, and in institute
The electricity is obtained using frequency speed measuring method according to the level signal of the alternation when stating the revolving speed of motor more than or equal to preset rotation speed
The revolving speed of machine is obtained according to the level signal of the alternation using period velocimetry when the revolving speed of the motor is less than preset rotation speed
The revolving speed of the motor is taken, and first preset time is adjusted to control the motor according to the revolving speed of the motor
Whole constant-speed operation, wherein second preset time is the half period of the alternating current.
8. the constant-speed control device of food cooking machine as claimed in claim 7, which is characterized in that the control module is described
The rising edge of crossover point signal postpones to export after first preset time unbalanced pulse signal to described controllable when arriving
Silicon module.
9. the constant-speed control device of food cooking machine as claimed in claim 7 or 8, which is characterized in that the control module root
When being adjusted first preset time to control the motor whole process constant-speed operation according to the revolving speed of the motor, it is also used to
Judge whether the revolving speed of the motor is greater than rotating speed of target, wherein
If the revolving speed of the motor is greater than the rotating speed of target, control module if, increases first preset time, leads to
Crossing reduces the turn-on time of the silicon controlled module to reduce the revolving speed of the motor, until the revolving speed of the motor be equal to it is described
Rotating speed of target；
If the revolving speed of the motor is less than the rotating speed of target, control module if, reduces first preset time, leads to
Cross and increase the turn-on time of the silicon controlled module to improve the revolving speed of the motor, until the revolving speed of the motor be equal to it is described
Rotating speed of target.
10. the constant-speed control device of food cooking machine as claimed in claim 7, which is characterized in that the series of the magnet ring is
Even number and be more than or equal to 12 grades.
11. the constant-speed control device of food cooking machine as claimed in claim 10, which is characterized in that the magnet ring is arranged in electricity
On rotor shaft between machine ontology and motor blower fan, be perhaps arranged on the rotor shaft below the motor blower fan or
It is arranged on the rotor shaft between motor mandrel connector and the motor body.
12. the constant-speed control device of food cooking machine as claimed in claim 7, which is characterized in that the control module uses
When period velocimetry obtains the revolving speed of the motor, two pulses in the level signal of the alternation are generated by timer
Interval width measures, and the interval width generated according to described two pulses and the magnet ring rotate one week Hall
Pulse number corresponding to the level signal of the alternation of sensor output calculates the revolving speed of the motor.
13. the constant-speed control device of food cooking machine as claimed in claim 7, which is characterized in that the control module uses
When frequency speed measuring method obtains the revolving speed of the motor, the electricity of the alternation of the Hall sensor output in third preset time is obtained
Pulse number corresponding to ordinary mail number, and turning for the motor is calculated according to the third preset time and the pulse number
Speed.
14. a kind of food cooking machine, which is characterized in that including the food cooking machine as described in any one of claim 7-13
Constant-speed control device.
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| CN110868127A (en) * | 2019-10-18 | 2020-03-06 | 珠海凯邦电机制造有限公司 | Motor speed pulse frequency conversion method, computer readable storage medium and motor |
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