CN102983798A - Brushless motor and device with same - Google Patents
Brushless motor and device with same Download PDFInfo
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- CN102983798A CN102983798A CN2012104602345A CN201210460234A CN102983798A CN 102983798 A CN102983798 A CN 102983798A CN 2012104602345 A CN2012104602345 A CN 2012104602345A CN 201210460234 A CN201210460234 A CN 201210460234A CN 102983798 A CN102983798 A CN 102983798A
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Abstract
The invention provides a brushless motor and a device with the brushless motor. The brushless motor comprises a solenoid coil, a permanent magnet, a drive control circuit, a magnetic sensor, and a temperature sensor. The drive control circuit generates driving signals driving the above solenoid coil. Themagnetic sensor detects distances of the solenoid coil and the permanent magnet. Thetemperature sensor detects temperature of the solenoid coil. Thedrive control circuit generates the driving signals in proportion to detected values of the temperature sensor.
Description
Patent application of the present invention is that denomination of invention is the dividing an application for the application for a patent for invention of " 200710153372.8 " that " brushless motor ", the applying date be on September 18th, 2007, application number.
The priority that Japanese publication 2007-99543 number that the application advocates to propose on September 19th, 2006 Japanese publication proposed on December 7th, 2006-253083 number 1 Japanese publication proposed on April 5th, 2006-330431 number 1 and the Japanese publication that proposed on April 26th, 2007 are 2007-117234 number.In order to reference and the integral body of the disclosure of above-mentioned application is joined among the application.
Technical field
The present invention relates to the Drive Control Technique of brushless motor.
Background technology
As brushless motor, for example known have a brushless motor of putting down in writing in JPA2001-298982.
In brushless motor in the past, usually use square wave as driving signal.When using the driving signal of square wave, might cause motor overheating because driving the overcurrent that produces when signal polarity is reversed.Therefore, in brushless motor in the past, be typically provided with the circuit for the restriction overcurrent.
Figure 23 is illustrated in an example of the overcurrent limiting circuit of using in the past the brushless motor.In this circuit, the ground connection side at the bridge circuit HB of the coil C that drives brushless motor is provided with overcurrent and detects with transistor PT and over-current sensor ECS.When overcurrent flows through bridge circuit HB, utilize over-current sensor ECS to detect the situation that overcurrent flows through.Drive circuit limits according to the output signal of this over-current sensor ECS and applies voltage and apply electric current what coil C applied.
What originally expect is only just to carry out the restriction of overcurrent when abnormal situation appears in the excessive grade of load.But owing to will flow through sizable electric current when motor starting, therefore, current limit causes excessively Limited Current with regard to beginning action when starting sometimes.In when starting excessively during Limited Current, can't produce the such problem of enough torques when like this when having.
Summary of the invention
The object of the invention is to, provide a kind of in brushless motor Limited Current and can prevent the technology of motor overheating excessively not.
The brushless motor of a first aspect of the present invention has: solenoid; Permanent magnet; Drive and Control Circuit, it generates the driving signal that drives above-mentioned solenoid; Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And temperature sensor, it detects the temperature of above-mentioned solenoid, and above-mentioned Drive and Control Circuit generates the proportional driving signal of detected value with the said temperature transducer.
In addition, the brushless motor of a second aspect of the present invention has: solenoid; Permanent magnet; Drive and Control Circuit, it generates the driving signal that drives above-mentioned solenoid; Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And temperature sensor, it detects the temperature of above-mentioned solenoid, and above-mentioned Drive and Control Circuit generates the driving signal according to the detected value of above-mentioned Magnetic Sensor and the detected value of said temperature transducer.
In addition, the brushless motor of a third aspect of the present invention has: solenoid; Permanent magnet; Drive and Control Circuit, it has the driving element that electric current is provided to above-mentioned solenoid, generates the driving signal that drives above-mentioned solenoid; Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And temperature sensor, it detects the temperature of above-mentioned driving element, and above-mentioned Drive and Control Circuit generates the proportional driving signal of detected value with the said temperature transducer.
In addition, the brushless motor of a fourth aspect of the present invention has: solenoid; Permanent magnet; Drive and Control Circuit, it has the driving element that electric current is provided to above-mentioned solenoid, generates the driving signal that drives above-mentioned solenoid; Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And temperature sensor, it detects the temperature of above-mentioned driving element, and above-mentioned Drive and Control Circuit generates the driving signal according to the detected value of above-mentioned Magnetic Sensor and the detected value of said temperature transducer.
In addition, the brushless motor of a fifth aspect of the present invention has: solenoid; Permanent magnet; Drive and Control Circuit, it generates the driving signal that drives above-mentioned solenoid; Magnetic Sensor, it detects the distance between above-mentioned permanent magnet and the above-mentioned solenoid; And temperature sensor, it detects the temperature of above-mentioned brushless motor, and above-mentioned Drive and Control Circuit rounds after this three of command value of the operation voltage of the detected value of the detected value of above-mentioned Magnetic Sensor, said temperature transducer and above-mentioned brushless motor is multiplied each other.
In addition, the brushless motor of a sixth aspect of the present invention has: the coil column with a plurality of solenoids; Magnet row with a plurality of permanent magnets; Magnetic Sensor, it detects the relative position of above-mentioned magnet row and above-mentioned coil column; Drive and Control Circuit, it utilizes the output of above-mentioned Magnetic Sensor, drives above-mentioned coil column with driving element; And temperature sensor, it detects the detected object temperature that any one party in the temperature with the temperature of the coil of above-mentioned coil column and above-mentioned driving element is associated, when the detected object temperature that is detected by the said temperature transducer has surpassed the 1st threshold value of regulation, above-mentioned Drive and Control Circuit reduces the virtual value of the driving voltage that offers above-mentioned coil column, above-mentioned Drive and Control Circuit has drive signal generation circuit, this drive signal generation circuit generates control provides driving signal from a plurality of driving elements of electric current to above-mentioned coil column, above-mentioned drive signal generation circuit has: temperature monitor circuit, it generates the temperature monitoring signal that signal level changes along with above-mentioned detected object temperature according to the output of said temperature transducer; And waveform signal generating unit, it is at least according to the output of said temperature supervisory signal and above-mentioned Magnetic Sensor, generation is expressed the variation identical with the analog variation of the output of above-mentioned Magnetic Sensor and is had waveform signal with the proportional amplitude of signal level of said temperature supervisory signal, above-mentioned waveform signal generating unit has multiplier, this multiplier rounds after the command value of the output of above-mentioned Magnetic Sensor, above-mentioned operation voltage and this three of said temperature supervisory signal are multiplied each other, and generates above-mentioned waveform signal.
In addition, the present invention can realize in many ways, for example, and can be with brushless motor and control method (perhaps driving method) thereof, realize with their actuator or the mode such as electronic equipment, home appliance, moving body.
Description of drawings
Figure 1A～1C is the cutaway view of the motor body structure of the brushless motor among expression the 1st embodiment.
The key diagram of the magnet row when Fig. 2 A～2D is the expression motor action and the position relationship of coil column.
Fig. 3 A～3C is the output of expression transducer and the key diagram that drives the example of signal.
Fig. 4 A, 4B are the block diagrams of structure of Drive and Control Circuit of the brushless motor of expression the 1st embodiment.
Fig. 5 is the figure of the internal structure of expression drive circuit.
Fig. 6 A～6E is that expression drives the internal structure of signal generating unit and the key diagram of action.
Fig. 7 A～7C is the key diagram of the corresponding relation of expression Magnetic Sensor output waveform and drive signal waveform.
Fig. 8 is the block diagram of the internal structure of expression PWM section.
The sequential chart of the action of PWM section when Fig. 9 is expression motor forward.
The sequential chart of the action of PWM section when Figure 10 is the counter-rotating of expression motor.
Figure 11 A, 11B are the internal structure of the interval configuration part of expression excitation and the key diagram of action.
Figure 12 is the block diagram of other structure of the Drive and Control Circuit of expression brushless motor.
Figure 13 A, 13B are the key diagrams of other installation example of expression temperature sensor.
Figure 14 is the block diagram of structure of Drive and Control Circuit of the brushless motor of expression present embodiment.
Figure 15 is the figure of the internal structure of expression drive circuit.
Figure 16 A～16E is that expression drives the internal structure of signal generating unit and the key diagram of action.
Figure 17 is the curve chart of the relation between expression temperature monitoring signal Za and the temperature signal.
Figure 18 is the key diagram of the internal structure of the interval configuration part of expression excitation.
Figure 19 is the block diagram of other structure of the Drive and Control Circuit of expression brushless motor.
Figure 20 is the key diagram of the projecting apparatus of the expression motor that adopts embodiments of the invention.
Figure 21 A～21C is the key diagram of the fuel cell formula portable phone of the expression motor that adopts embodiments of the invention.
Figure 22 is that expression is as the key diagram of the electric bicycle (electric assisted bicycle) of an example of the moving body of the motor/generator that adopts embodiments of the invention.
Figure 23 is the key diagram of an example of the overcurrent limiting circuit used in the brushless motor that is illustrated in the past.
Embodiment
Below, embodiments of the present invention are described in the following order.
A. the summary of the structure of motor and action;
B. the structure of Drive and Control Circuit;
C. other embodiment;
D. variation.
A. the summary of the structure of motor and action
Figure 1A～1C is that expression is as the profile of the motor body structure of the brushless motor of one embodiment of the present of invention.This motor body 100 has profile and is respectively roughly discoid stator department 10 and rotor portions 30.At stator department 10(Fig. 1 C) on, the 2 groups of solenoids 11,12 on circuit substrate 120 be provided with; 2 Magnetic Sensor 40A, 40B; And 2 temperature sensor 50A, 50B.The 1st Magnetic Sensor 40A is the transducer of the 1st group of coil 11 usefulness, and the 2nd Magnetic Sensor 40B is the transducer of the 2nd group of coil 12 usefulness.Below, 2 groups of solenoids 11,12 are called " A phase coil 11 ", " B phase coil 12 ".
The 1st temperature sensor 50A is the transducer for the temperature of measuring A phase coil 11, and the 2nd temperature sensor 50B is the transducer for the temperature of measuring B phase coil 12.Preferably with coil 11,12 contacted states under these temperature sensors 50A, 50B are set, but also can be arranged on coil 11,12 near.In addition, preferably the coil groups of each phase is respectively provided to few temperature sensor.Thus, when when the coil midstream of phase is crossed larger electric current arbitrarily, can prevent that coil is overheated.
At rotor portions 30(Figure 1B) on, being provided with 2 magnet 32, the central shaft of rotor portions 30 consists of rotating shaft 112.The direction of magnetization of these magnet 32 is direction vertical with paper in Figure 1B, and this is equivalent to the above-below direction among Figure 1A.
The key diagram of the magnet row when Fig. 2 A～2D is the expression motor action and the position relationship of coil column.In addition, in these accompanying drawings, for ease of diagram, have a plurality of magnet 32 although depict as, actual magnet quantity is 2 as shown in Figure 1B.But, as magnet quantity and coil quantity, can adopt suitable arbitrarily integer.Shown in Fig. 2 A, magnet 32 is to dispose by certain distance between two poles Pm, and adjacent magnet is in the opposite direction magnetization each other.And, consist of 2 coils of coil groups of 1 phase by certain spacing Pc configuration, always excitation in the same direction.1/2 of spacing Pc between the spaced in-phase coil of the coil of adjacent phase.Spacing Pc between in-phase coil equals distance between two poles Pm.Press electrical angle, distance between two poles Pm is equivalent to π.In addition, electrical angle 2 π are corresponding to the mechanical angle or the distance that have moved when the phase place that drives signal has changed 2 π.In the present embodiment, when the phase place that drives signal had changed 2 π, rotor portions 30 moved 2 times of distance between two poles Pm.
It is 0 or the state during 2 π that Fig. 2 A illustrates phase place.And, the state when Fig. 2 B～2D illustrates respectively phase place and is pi/2, π, 3 pi/2.In addition, omitted the hatching of A phase coil 11 in Fig. 2 A, 2C, this is because in these regularly polarity inversions of the driving signal of A phase coil 11 (that is, excitation direction counter-rotating).Similarly, in the timing of Fig. 2 B, 2D, the polarity inversion of the driving signal of B phase coil 12.
Fig. 3 is the output of expression transducer and the key diagram that drives the example of signal.The transducer output SSA that Fig. 3 A represents A phase Magnetic Sensor 40A and B be the transducer output SSB of Magnetic Sensor 40B mutually.In addition, as Magnetic Sensor 40A, 40B, can utilize the Hall IC transducer with simulation output.Fig. 3 B represents the example of the actual effect driving voltage VB that imposes on the actual effect driving voltage VA of A phase coil 11 and impose on B phase coil 12.Preferably these actual effect driving voltages VA, VB the has shape similar to the output of each Magnetic Sensor SSA, SSB.Fig. 3 C represents to control the example that 2 of respectively generation drives signal mutually by the PWM that utilizes Magnetic Sensor output SSA, SSB.Actual effect driving voltage VA shown in Fig. 3 B utilizes A to drive mutually signal DRVA1, DRVA2 and the virtual voltage that obtains.In addition, the 1st of A phase drive signal DRVA1 be only when Magnetic Sensor output SSA be the signal that timing just produces pulse, the 2nd drive signal DRVA2 be only when Magnetic Sensor output SSA be the signal that timing just produces pulse, in Fig. 3 C, make up these contents and put down in writing.And, for simplicity, drive the pulse that signal DRVA2 is depicted as minus side with the 2nd.B is also identical mutually.
B. the structure of Drive and Control Circuit
Fig. 4 A is the block diagram of structure of Drive and Control Circuit of the brushless motor of expression present embodiment.Drive and Control Circuit 200 has CPU 220, drives signal generating unit 240,2 phase drive circuit 250A, 250B, AD converter section 260 and superheat limit section 270.AD converter section 260 offers driving signal generating unit 240 after 2 Magnetic Sensor outputs SSA, SSB are converted to digital multi-valued signal.Driving signal generating unit 240 generates 2 according to these 2 Magnetic Sensors outputs SSA, SSB and drives mutually signal (Fig. 3 C). Drive circuit 250A, 250B 2 drive mutually signal and come 2 phase solenoid groups 11,12 in the drive motor main body 100 according to this.
Fig. 4 B represents an example of the internal structure of Magnetic Sensor 40A.B also has the structure identical with it with Magnetic Sensor 40B mutually.This Magnetic Sensor 40A has Hall element 42, bias-adjusted section 44 and gain-adjusted section 46.Hall element 42 is measured magnetic flux density X.The output X of 44 pairs of Hall elements 42 of bias-adjusted section adds bias b, and gain-adjusted section 46 is multiplied by yield value a to it.For example, provide the output SSA(=Y of Magnetic Sensor 40A by following formula (1) or formula (2)).
Y＝a·X＋b …（1）
Y＝a（X＋b） …（2）
Utilize CPU 220 in Magnetic Sensor 40A, to set yield value a and the bias b of Magnetic Sensor 40A.By yield value a and bias b are set as appropriate value, Magnetic Sensor can be exported the SSA correction and be good waveform shape.40B is also identical for B phase Magnetic Sensor.
Shown in Fig. 4 A, the output signal TA of 2 temperature sensor 50A, 50B, TB are provided for superheat limit section 270.Superheat limit section 270 judges whether the value of these output signals TA, TB has surpassed defined threshold, generates superheat limit signal OHL.For example, superheat limit signal OHL is that output signal TA, TB all are that at least one party of high level, output signal TA, TB is low level 1 signal when having surpassed defined threshold when defined threshold is following.Can be understood as, superheat limit signal OHL is the signal whether coil temperature of any one party in expression A phase coil 11 and the B phase coil 12 has surpassed the threshold temperature of regulation.This superheat limit signal OHL is provided for and drives signal generating unit 240.As described later, drive signal generating unit 240 limiting coil 11, actual effect of 12 when superheat limit signal OHL is low level and apply voltage.
In addition, in the Drive and Control Circuit 200 of present embodiment, be not arranged on current limit circuit illustrated in fig. 14.Therefore, the action by temperature sensor 50A, 50B and superheat limit section 270 prevents that coil is overheated.
Fig. 5 represents the internal structure of drive circuit.Each phase drive circuit 250A, 250B consist of respectively H type bridge circuit.For example, A phase drive circuit 250A drives A phase coil 11 according to driving signal DRVA1, DRVA2.The arrow that is attached with label IA1, IA2 represents respectively the sense of current that flows through by driving signal DRVA1, DRVA2.Other are also identical mutually.In addition, as drive circuit, can use the circuit of the various structures that is consisted of by a plurality of driving transistorss.
Fig. 6 is that expression drives signal generating unit 240(Fig. 4 A) internal structure and the key diagram of action.In addition, for ease of diagram, A only is shown uses mutually the circuit key element herein, but for B mutually with also being provided with identical circuit key element.
Drive signal generating unit 240 and have the interval configuration part 590 of fundamental clock generative circuit 510,1/N frequency divider 520, PWM section 530, both forward and reverse directions indicated value register 540, multiplier 550, coding section 560, voltage instruction value register 580 and excitation.A phase Magnetic Sensor output SSA is provided for coding section 560 and the interval configuration part 590 of excitation.Superheat limit signal OHL is provided for the interval configuration part 590 of excitation.
Fundamental clock generative circuit 510 is the circuit that produce the clock signal PCL with assigned frequency, for example is made of the PLL circuit.Frequency divider 520 produces the clock signal SDC of the 1/N frequency with this clock signal PCL.The value of N is set to the certain value of regulation.In advance frequency divider 520 is set the value of this N by CPU 220.The multiplication value Ma that PWM section 530 provides according to clock signal PCL, SDC, from multiplier 550, the both forward and reverse directions indicated value RI that provides from both forward and reverse directions indicated value register 540, the sign symbol signal Pa that provides from coding section 560 and the excitation wayside signaling Ea that provides from the interval configuration part 590 of excitation generate A and drive mutually signal DRVA1, DRVA2(Fig. 3 C).To narrate in the back this action.
The value RI that is represented the motor direction of rotation by CPU 220 in the 540 interior settings of both forward and reverse directions indicated value register.In the present embodiment, motor forward when both forward and reverse directions indicated value RI is low level, motor counter-rotating when being high level.Determine as described below to offer other signal Ma, Pa, the Ea of PWM section 530.
The output SSA of Magnetic Sensor 40A is provided for coding section 560.The scope of the 560 pairs of Magnetic Sensors output SSA of coding section is changed, and the value in the middle site of transducer output is set as 0.Its result, the sensor output value Xa that is generated by coding section 560 get the value of the prescribed limit (for example+127～0) of positive side and the prescribed limit of minus side (for example 0～-127).But, what offer multiplier 550 from coding section 560 is the absolute value of sensor output value Xa, and its sign symbol is provided for PWM section 530 as sign symbol signal Pa.
The voltage instruction value Ya that 580 storages of voltage instruction value register are set by CPU 220.This voltage instruction value Ya plays a role as being used for setting the executing alive value of motor with excitation wayside signaling Ea described later, for example gets 0～1.0 value.It is interval and when setting excitation wayside signaling Ea in the mode that whole interval is made as the excitation interval, Ya=0 represents to apply voltage and is made as 0 to suppose not arrange non-excitation, and Ya=1.0 represents to apply voltage and is made as maximum.550 pairs of multipliers round after the sensor output value Xa of coding section 560 outputs and voltage instruction value Ya multiply each other, and provide this value of multiplying each other Ma to PWM section 530.
Fig. 6 B～6E represent to multiply each other action of the PWM section 530 of value Ma when getting various value.Suppose that whole interval does not have non-excitation interval for excitation is interval herein.PWM section 530 is such circuit: in during 1 cycle of clock signal SDC, produce 1 pulse that duty ratio is Ma/N.That is, shown in Fig. 6 B～6E, along with the value Ma that multiplies each other increases, the duty ratio that A drives the pulse of signal DRVA1, DRAV2 mutually increases.In addition, the 1st drive signal DRVA1 be only when Magnetic Sensor output SSA be the signal that timing just produces pulse, the 2nd drive signal DRVA2 be only when Magnetic Sensor output SSA be the signal that timing just produces pulse, in Fig. 6 B～6E, make up these contents and put down in writing.And, for simplicity, drive the pulse that signal DRVA2 is depicted as minus side with the 2nd.
Fig. 7 A～7C is the key diagram of the corresponding relation of expression Magnetic Sensor output waveform and the drive signal waveform that generated by PWM section 530.In the drawings, " Hiz " expression is made as the not high impedance status of excited state with solenoid.As illustrated in fig. 6, A drives mutually signal DRVA1, DRVA2 and generates by the PWM control that utilizes Magnetic Sensor to export the analog waveform of SSA.Therefore, can use these A to drive mutually signal DRVA1, DRVA2, provide the expression virtual voltage that the level corresponding with the variation of Magnetic Sensor output SSA changes to each coil.
In addition, as described above, when voltage instruction value Ya being set as less than 1 value, the value that multiplies each other Ma and voltage instruction value Ya diminish pro rata.Thereby, also can regulate the voltage that applies of actual effect by voltage instruction value Ya.
Be appreciated that the brushless motor of present embodiment that from above-mentioned explanation the two is regulated and applies voltage can to utilize voltage instruction value Ya and excitation wayside signaling Ea.Preferably at Drive and Control Circuit 200(Fig. 4 A) in memory in advance with the relation between voltage, voltage instruction value Ya and the excitation wayside signaling Ea of applying of the form storage expectation of table.Thus, when Drive and Control Circuit 200 receive from the outside expectation execute alive desired value the time, CPU 220 can be according to this desired value, to driving signal generating unit 240 setting voltage command value Ya and excitation wayside signaling Ea.In addition, when adjusting applies voltage, also can need not to utilize voltage instruction value Ya and excitation wayside signaling Ea the two, and only utilize any one party.
Fig. 8 is expression PWM 530(Fig. 6 of section) the block diagram of an example of internal structure.PWM section 530 has counter 531, EXOR circuit 533 and drive waveforms forming portion 535.These parts are moved as following.
Fig. 9 is the sequential chart of the action of the PWM section 530 when the motor forward is shown.In the figure, show count value CM 1, the output S1 of counter 531, the output S2 of EXOR circuit 533 and output signal DRVA 1, the DRVA 2 of drive waveforms forming portion 535 in 2 clock signal PCL, SDC, both forward and reverse directions indicated value RI, excitation wayside signaling Ea, the value that multiplies each other Ma, sign symbol signal Pa, the counter 531.Counter 531 during per 1 of clock signal SDC in, synchronously repeatedly subtract counting action with clock signal PCL, until count value CM 1 becomes 0.The initial value of count value CM 1 is set to multiplication value Ma.In addition, in Fig. 9, for ease of the diagram, the value that will multiply each other Ma is depicted as negative value, but in counter 531 use be its absolute value | Ma|.About the output S1 of counter 531, be not to be set to high level at 0 o'clock at count value CM 1, become at 0 o'clock at count value CM 1 and drop to low level.
The signal S2 of the XOR value of EXOR circuit 533 output expression sign symbol signal Pa and both forward and reverse directions indicated value RI.When the motor forward, both forward and reverse directions indicated value RI is low level.Thereby the output S2 of EXOR circuit 533 becomes the signal identical with sign symbol signal Pa.Drive waveforms forming portion 535 generates and drives signal DRVA 1 and DRVA 2 according to the output S1 of counter 531 and the output S2 of EXOR circuit 533.Namely, signal during being low level with the output S2 at EXOR circuit 533 among the output S1 of counter 531 drives signal DRVA 1 output as the 1st, and the signal during output S2 high level among the output S1 is driven signal DRVA 2 outputs as the 2nd.In addition, near the right part of Fig. 9, excitation wayside signaling Ea drops to low level, has set thus the interval NEP of non-excitation.Thereby, in the interval NEP of this non-excitation, drive signal DRVA 1, DRVA2 and all do not export, keep high impedance status.
Figure 10 is the sequential chart of the action of the PWM section 530 when the motor counter-rotating is shown.When motor reversed, both forward and reverse directions indicated value RI was set to high level.Its result compares 2 driving signal DRVA 1, DRVA2 with Fig. 9 and replaces mutually, and its result can understand motor and will reverse.
Figure 11 illustrates the internal structure of the interval configuration part 590 of excitation and the key diagram of action.The interval configuration part 590 of excitation has electronic variable resistor device 592, voltage comparator 594,596, OR circuit 598 and AND circuit 599.Set the resistance value Rv of electronic variable resistor device 592 by CPU 220.The both end voltage V1 of electronic variable resistor device 592, V2 are applied to voltage comparator 594, an input terminal of 596.Magnetic Sensor output SSA is provided for voltage comparator 594, another input terminal of 596.Voltage comparator 594,596 output signal Sp, Sn are imported into OR circuit 598.The output EEa of OR circuit 598 is imported into AND circuit 599 with superheat limit signal OHL.The output of AND circuit 599 is the excitation wayside signaling Ea in and non-excitation interval interval for the difference excitation.
The action of the interval configuration part 590 of the excitation when Figure 11 B represents that superheat limit signal OHL is high level.Change both end voltage V1, the V2 of electronic variable resistor device 592 by adjusting resistance value Rv.Particularly, both end voltage V1, V2 are set as median with respect to the voltage range (value that=VDD/2) difference equates.When Magnetic Sensor output SSA was higher than the 1st voltage V1, the output Sp of the 1st voltage comparator 594 became high level, and on the other hand, when Magnetic Sensor output SSA was lower than the 2nd voltage V2, the output Sn of the 2nd voltage comparator 596 became high level.Excitation wayside signaling Ea(=EEa) be get these output signals Sp, Sn logic and signal.Therefore, shown in the bottom of Figure 11 B, can be with the signal of excitation wayside signaling Ea as the interval EP of expression excitation and the interval NEP of non-excitation.By regulating the setting that variable resistance Rv carries out the interval EP of excitation and the interval NEP of non-excitation by CPU 220.
Yet as previously mentioned, when the temperature of any one party in A phase coil 11 and the B phase coil 12 had surpassed the defined threshold temperature, superheat limit signal OHL became low level.In this case, no matter the level of the output EEa of OR circuit 598 how, excitation wayside signaling Ea is always low level.Its result does not apply voltage to coil 11,12, can prevent coil 11,12 overheated.The circuit structure that is appreciated that the interval configuration part 590 of excitation from above-mentioned explanation can be divided into 2 following circuit parts: no matter how superheat limit signal OHL generates the 1st excitation wayside signaling EEa(shown in Figure 11 B and be also referred to as " the excitation wayside signaling of preparation ") the 1st interval configuration part (being consisted of by key element 592,594,596,598) and get the 1st excitation wayside signaling EEa and the logical operation circuit 599 of the logic product of superheat limit signal OHL.Set the 1st excitation wayside signaling EEa by resistance value Rv, and, set resistance value Rv according to the command value (desired value) of the operation voltage of the brushless motor that provides from the outside.Therefore, can be regarded as according to the command value of the operation voltage of the brushless motor that provides from the outside and set the 1st excitation wayside signaling EEa.
As mentioned above, in the brushless motor of above-described embodiment, the action by temperature sensor 50A, 50B and superheat limit section 270 prevents each phase coil 11,12 overheated.Therefore, do not need to arrange in the past such current limit circuit.In addition, owing to can prevent at when starting Limited Current excessively, so can't produce the such defective of enough torques in the time of can also preventing from starting.That is, when the electric power that carries out in the zone that the magnetic pole of the SN utmost point intersects as in the past driving based on square waveform is supplied with, produce short circuit current, thereby current limit circuit must be arranged.But in the present embodiment, the electric power that drives based on sinusoidal waveform as shown in Figure 7 in the zone of this intersection is supplied with suppressed and can not produced short circuit current, does not therefore need current limit circuit.In addition, owing to be identified in design when starting, obtaining the impedance of starting current and the solenoid of starting torque, therefore do not need in design overcurrent protection.In addition, when producing the overload not have in design to expect, can suppress overcurrent more than the design time by temperature detection.
Figure 12 is the block diagram of other structure of the Drive and Control Circuit of expression brushless motor.This Drive and Control Circuit 200a is provided with respectively temperature sensor 60A, 60B on drive circuit 250A, the 250B of the Drive and Control Circuit 200 shown in Fig. 4 A.In addition, motor body 100a has omitted temperature sensor 50A, 50B from the motor body 100 of Fig. 4 A.Other structure is identical with the circuit shown in Fig. 4 A.Temperature sensor 60A, 60B are for detection of the temperature of the driving element (driving transistors) that consists of drive circuit 250A, 250B.
Figure 13 A represents the installation example of temperature sensor 60A.In this example, upload the power semiconductor that is equipped with formation drive circuit 250A at heat-radiating substrate 252, temperature sensor 60A is installed in this power semiconductor.Temperature sensor 60B(is installed in another drive circuit 250B too omits diagram).As temperature sensor 60A, 60B, for example can use diode element.Because the current-voltage characteristic of diode element depends on temperature, so can come detected temperatures by the current-voltage characteristic of measuring diode element.In this case, preferably at the 270(Figure 12 of superheat limit section) in be provided for determining that according to the current-voltage characteristic of diode element the temperature of temperature determines circuit.Superheat limit section 270 judges whether surpassed defined threshold according to the determined temperature of the output of temperature sensor 60A, 60B, generates superheat limit signal OHL.This function with illustrated in fig. 4 identical.In addition, preferably superheat limit section 270 interior temperature determine that circuit has the temperature compensation function for the temperature characterisitic of compensation itself.
Figure 13 B represents other installation example of temperature sensor.In this example, be provided with heating panel 254 at drive circuit 250A, 250B, be provided with temperature sensor 60 at this heating panel 254.In addition, in this example, temperature sensor 60 is 1, but also 1 temperature sensor can be set respectively respectively near each drive circuit 250A, 250B.Temperature sensor 60 is not used in the temperature of the driving element self of measuring drive circuit 250A, 250B, and is used for measuring the temperature of the heating panel 254 that changes along with the temperature of driving element.Be appreciated that the temperature that also can not need to measure driving element self from this example, carry out superheat limit and detect with the detected object temperature of the temperature correlation connection of the driving element temperature of temperature one lifting of driving element (namely with).This point for above-mentioned coil temperature too.
C. other embodiment
Figure 14 is the block diagram of structure of Drive and Control Circuit of the brushless motor of another embodiment of expression.This Drive and Control Circuit 200b has following structure: the superheat limit section 270 of the circuit shown in Fig. 4 A is replaced into AD converter section 280, and has appended warning display part 290.Output signal TA, the TB(of temperature sensor 50A, 50B are called " temperature signal ") converted to digital multi-valued signal by AD converter section 280, provide it to and drive signal generating unit 240.Drive signal generating unit 240 according to Magnetic Sensor output SSA, SSB and temperature signal TA, TB, generate the driving signal (Fig. 3 C) of 2 phases.
In addition, in the Drive and Control Circuit 200b of present embodiment, be not arranged on current limit circuit illustrated in fig. 23.Therefore, the action by temperature sensor 50A, 50B and driving signal generating unit 240 prevents that coil is overheated.
Figure 15 represents other structure of drive circuit.Each phase drive circuit 250A, 250B have respectively 4 transistors 301～304 that consist of H type bridge circuit.Be provided with before level translator (level shifter) 311,313 at the transistor 301 of upper arm (arm), 303 gate electrode.But, also can omit level translator.
Figure 16 is the internal structure of expression driving signal generating unit 240 shown in Figure 14 and the key diagram of action.In addition, for ease of diagram, only show the mutually circuit key element of usefulness of A herein, but for B mutually with also being provided with identical circuit key element.
This driving signal generating unit 240 has the structure of having appended temperature monitoring section 570 in the circuit shown in Fig. 6 A.Temperature signal TA, TB are provided for temperature monitoring section 570.This action and circuit shown in Fig. 6 A that drives signal generating unit 240 is roughly the same, but the aspect of following explanation is slightly different.
The voltage instruction value Ya that 580 storages of voltage instruction value register are set by CPU 220.This voltage instruction value Ya is as being also referred to as " temperature gain Za " with the temperature monitoring signal Za(that is generated by temperature monitoring section 570) come together to set the alive value of executing of motor and play a role.
Figure 17 is the temperature monitoring signal Za that generated by temperature monitoring section 570 of expression and the curve chart of the relation between the temperature signal.Transverse axis represents the temperature (being also referred to as " detected object temperature ") that represents with temperature signal TA or TB, and the longitudinal axis represents the level of temperature monitoring signal Za.In the temperature range before the detected object temperature reaches the 1st threshold value TT1 of regulation, temperature monitoring signal Za maintains the 1.0(maximum).When the detected object temperature is the 1st threshold value TT1 when above, the level of the temperature monitoring signal Za that successively decreases monotonously is so that the higher then temperature monitoring of detected object temperature signal Za is less.In addition, when the detected object temperature is the 2nd threshold value TT2 of regulation when above, temperature monitoring signal Za is 0.In addition, in the present embodiment, 2 temperature signal TA, TB are input to temperature monitoring section 570, but as the detected object temperature, can use one (high value or low value) in the represented temperature of 2 temperature signal TA, TB.The temperature monitoring signal Za that generates is like this offered multiplier 550 from temperature monitoring section 570.
550 pairs of multipliers round after sensor output value Xa, the voltage instruction value Ya of 560 outputs of coding section and these 3 values of temperature monitoring signal Za multiply each other, and provide this value of multiplying each other Ma to PWM section 530.
Figure 17 B～17E represent to multiply each other action of the PWM section 530 of value Ma when getting various value.As previously mentioned, the value Ma that multiplies each other is the multiplied result of 3 value Xa, Ya and Za.Therefore, the value Ma that multiplies each other expresses the variation identical with the analog variation (Fig. 3 A) of Magnetic Sensor output SSA and has the two the digital signal of the proportional amplitude of signal level with voltage instruction value Ya and temperature monitoring signal Za.In addition, normally close to the signal of sine wave, therefore, the digital signal that represents with the value Ma that multiplies each other also is the signal that has close to the waveform of sine wave to Magnetic Sensor output SSA.Therefore, in the present embodiment, will be called " waveform signal " with the digital signal that the value Ma that multiplies each other represents.In addition, also can omit command value register 580 and not use voltage instruction value Ya.In this case, the value Ma that multiplies each other becomes and expresses the variation identical with the analog variation of Magnetic Sensor output SSA and have digital signal with the proportional amplitude of temperature monitoring signal Za.
The 530(Fig. 6 of PWM section) controls to generate the driving signal of expressing the virtual voltage variation identical with the variation (being the variation of waveform signal) of this value of multiplying each other Ma by PWM.Therefore, virtual voltage and the temperature monitoring signal Za of driving signal are proportional.Its result is when the detected object temperature becomes the 1st threshold value TT1(Figure 17) when above, the virtual voltage of the driving signal of the higher then coil of detected object temperature is lower, thereby prevents motor overheating.In addition, because the gradually decline along with the rising of detected object temperature of the level of temperature monitoring signal Za, so can prevent excessively Limited Current.For example, the load of motor becomes large in the rotating process of motor, in its situation that detected object temperature rises as a result, reduce gradually according to the property driving voltage of Figure 17, so can prevent overheated.
In addition, in the example of Figure 17, in the temperature range of detected object temperature greater than the 1st threshold value TT1, be set with 4 different warning temperature ranges of alert level AL.Can be when the detected object temperature have reached the warning temperature range, by warning display part 290(Figure 16 A) show warning according to these alert level AL.Show by way of caution, for example can utilize the numeral of expression alert level AL, represent the multiple demonstration of alert level AL with different colours.Show that the user of motor just can identify the situation that motor is in transient state immediately as long as carry out such warning.
Also identical in the present embodiment with circuit structure in Fig. 7～action illustrated in fig. 11.Wherein, in the present embodiment, the waveform the when waveform of Fig. 7 A～7C is equivalent to Ya=1, Za=1.
Be appreciated that the brushless motor of present embodiment that from above-mentioned explanation when the value of temperature monitoring signal Za maintained 1.0, the two was regulated and applies voltage also can to utilize voltage instruction value Ya and excitation wayside signaling Ea.The pre-stored Drive and Control Circuit 200b(Figure 14 of arriving of the relation between voltage and voltage instruction value Ya and the excitation wayside signaling Ea of applying that preferably, will expect with the form of table) in the interior memory.Thus, Drive and Control Circuit 200b receive from the outside expectation execute alive desired value the time, CPU 220 can be according to this desired value to driving signal generating unit 240 setting voltage command value Ya and excitation wayside signaling Ea.In addition, when adjusting applies voltage, also can need not to utilize voltage instruction value Ya and excitation wayside signaling Ea the two, and only utilize wherein arbitrarily one.
Figure 18 is the internal structure of the interval configuration part 590 of expression excitation and the key diagram of action.The interval configuration part 590 of this excitation has the structure that dispenses AND circuit 599 from the circuit shown in Figure 11 A.Therefore, the output Ea of OR circuit 598 becomes the excitation wayside signaling Ea in and non-excitation interval interval for the difference excitation.
As mentioned above, in the brushless motor of above-described embodiment, by temperature sensor 50A, 50B and the 570(Figure 16 of temperature monitoring section) action prevent each phase coil 11,12 overheated.Therefore, need not to arrange in the past such current limit circuit.In addition, owing to also can prevent at when starting Limited Current excessively, so can't produce the such defective of enough torques in the time of can also preventing from starting.That is, when the electric power that carries out in the zone that the magnetic pole of the SN utmost point intersects as in the past driving based on square waveform is supplied with, produce short circuit current, thereby current limit circuit must be arranged.But in the present embodiment, the electric power that drives based on sinusoidal waveform as shown in Figure 7 in the zone of this intersection is supplied with suppressed and can not produced short circuit current, does not therefore need current limit circuit.In addition, owing to be identified in design when starting, obtaining the impedance of starting current and the solenoid of starting torque, therefore do not need in design overcurrent protection.In addition, when producing the overload not have in design to expect, can suppress overcurrent more than the design time by temperature detection.
Figure 19 is the block diagram of another structure example of the Drive and Control Circuit of expression brushless motor.This Drive and Control Circuit 200c is provided with respectively temperature sensor 60A, 60B in drive circuit 250A, the 250B of Drive and Control Circuit 200b shown in Figure 14.In addition, motor body 100a has dispensed temperature sensor 50A, 50B from the motor body 100 of Figure 14.Other structures are identical with circuit shown in Figure 14. Temperature sensor 60A, 60B are for detection of the temperature of the driving element (driving transistors) that consists of drive circuit 250A, 250B.Use this Drive and Control Circuit, also can obtain the effect identical with above-mentioned various embodiment.
D. variation
In addition, the invention is not restricted to above-described embodiment and execution mode, in the scope that does not break away from its aim, can implement variety of way, for example can be achieved as follows such distortion.
D1. variation 1:
In the illustrated embodiment of Fig. 1～Figure 13, when detected object temperature (coil temperature or driving element temperature) has surpassed the threshold temperature of regulation, stop to provide to coil applying voltage, but also can replace and the actual effect driving voltage that is applied to coil is reduced.Can realize in the following way such control: omit AND circuit 599 from the structure of the interval configuration part 590 of excitation shown in Figure 11, replacing arranges the resistance value adjusting circuit of regulating again the resistance value Rv of variable resistance 592 according to the level of superheat limit signal OHL.
In addition, also can realize with the circuit structure beyond the interval configuration part 590 of excitation the restriction of virtual value of the driving voltage of coil.For example, PWM section 530 is constituted, be 530(Fig. 6 of PWM section in the low level situation at superheat limit signal OHL) stop the PWM control action.
In addition, in the illustrated various embodiment of Figure 14～Figure 19, level according to detected object temperature (coil temperature or driving element temperature) changing temperature supervisory signal Za, correspondingly reduce the actual effect driving voltage of coil, but also can the actual effect driving voltage that be applied to coil be reduced with other circuit.For example, can realize in the following way such circuit structure: in the structure of the interval configuration part 590 of excitation shown in Figure 180, the resistance value adjusting circuit of regulating again the resistance value Rv of variable resistance 592 according to the level of detected object temperature (perhaps temperature monitoring signal Za) is set.
D2. variation 2:
In the above-described embodiments, utilized the simulation Magnetic Sensor, but also can use the digital Magnetic Sensor with many-valued simulation output, to replace the simulation Magnetic Sensor.The simulation Magnetic Sensor is being identical with the digital sensor with many-valued output aspect the output signal with expression analog variation.In addition, in this manual, the output signal of analog variation " expression " broadly comprised digital output signal with the above a plurality of level of 3 values and analog output signal the two, rather than open/close 2 values are exported.
D3. variation 3:
As pwm circuit, can adopt circuit shown in Figure 6 multiple circuit structure in addition.For example, also can utilize by relatively transducer output and benchmark triangular wave carry out the circuit that PWM controls.And, also can generate the driving signal by the method beyond the PWM control.And, also can adopt by the method beyond the PWM control and generate the circuit that drives signal.For example, also can adopt amplification sensor to export to generate the circuit of analog drive signal.
D4. variation 4:
In the above-described embodiments, the example of 2 utmost points, 2 phase motor has been described, but the number of poles of motor and the number of phases can adopt respectively arbitrarily and to count.
D5. variation 5:
The present invention can be applicable to the motor of the multiple devices such as fan motor, clock and watch (pointer driving), drum type washing machine (single direction rotation), fast slide driving and vibrating motor.The fan motor of various devices such as the equipment that can be used as the use fuel cells such as numeric display unit, mobile unit, fuel cell formula personal computer, fuel cell formula digital camera, fuel cell formula video camera, fuel cell formula portable phone and projecting apparatus of fan motor.Motor of the present invention can also be as the motor of various home appliances and electronic equipment.For example, in light storage device, magnetic memory apparatus, polygonal mirror drive unit etc., can be with motor of the present invention as spindle drive motor.In addition, motor of the present invention can also be used as the motor that moving body is used.
Figure 20 is the key diagram of the projecting apparatus of the expression motor that adopts embodiments of the invention.This projecting apparatus 600 has: 3 light source 610R, the 610G, the 610B that send the light of 3 kinds of colors of red, green, blue; 3 liquid crystal light valve 640R, the 640G, the 640B that respectively the light of these 3 kinds of colors are modulated; The cross colour splitting prism (cross dichroic prism) 650 that the light of 3 kinds of colors after the modulation is synthesized; The light of 3 kinds of colors after synthetic is projected the projection lens system 660 of screen SC; For the cooling fan 670 that projecting apparatus inside is cooled off; And the control part 680 of controlling projection instrument 600 integral body.Motor as driving cooling fan 670 can use above-mentioned various rotary brushless motor.
Figure 21 A～21C is the key diagram of the fuel cell formula portable phone of the expression motor that adopts embodiments of the invention.Figure 21 A represents the outward appearance of portable phone 700, and Figure 21 B represents the example of internal structure.Portable phone 700 has MPU 710, fan 720 and the fuel cell 730 of the action of control portable phone 700.Fuel cell 730 provides power supply to MPU 710 and fan 720.Fan 720 is used in order to provide air to fuel cell 730 perhaps will being discharged from portable phone 700 inside by the moisture that fuel cell 730 generates from portable phone 700 outsides to inner blower.In addition, also can shown in Figure 21 C, fan 720 be configured in MPU 710 tops, MPU 710 is cooled off.As the motor of drive fan 720, can use above-mentioned various rotary brushless motor.
Figure 22 is that expression is as the key diagram of the electric bicycle (electric assisted bicycle) of an example of the moving body of the motor/generator that adopts embodiments of the invention.This bicycle 800 is provided with motor 810 at front-wheel, and the framework below vehicle seat is provided with control circuit 820 and rechargable battery 830.Motor 810 drives front-wheel by the electric power that is used to self-charging pond 830, the next power-assisted of carrying out travelling.The electric power of being regenerated by motor 810 when braking in addition, is charged to rechargable battery 830.Control circuit 820 is the driving of control motor and the circuit of regeneration.As this motor 810, can utilize above-mentioned various brushless motor.
Claims (21)
1. brushless motor, this brushless motor has:
Solenoid;
Permanent magnet;
Drive and Control Circuit, it generates the driving signal that drives above-mentioned solenoid;
Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And
Temperature sensor, it detects the temperature of above-mentioned solenoid,
Above-mentioned Drive and Control Circuit generates the proportional driving signal of detected value with the said temperature transducer.
2. brushless motor, this brushless motor has:
Solenoid;
Permanent magnet;
Drive and Control Circuit, it generates the driving signal that drives above-mentioned solenoid;
Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And
Temperature sensor, it detects the temperature of above-mentioned solenoid,
Above-mentioned Drive and Control Circuit generates the driving signal according to the detected value of above-mentioned Magnetic Sensor and the detected value of said temperature transducer.
3. brushless motor according to claim 1 and 2, wherein, above-mentioned brushless motor has a plurality of above-mentioned solenoids and a plurality of above-mentioned permanent magnet.
4. the described brushless motor of any one according to claim 1～3, wherein, above-mentioned Magnetic Sensor detects distance between above-mentioned solenoid and the above-mentioned permanent magnet as magnitude of voltage, and the said temperature transducer detects the temperature of above-mentioned solenoid as magnitude of voltage.
5. brushless motor, this brushless motor has:
Solenoid;
Permanent magnet;
Drive and Control Circuit, it has the driving element that electric current is provided to above-mentioned solenoid, generates the driving signal that drives above-mentioned solenoid;
Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And
Temperature sensor, it detects the temperature of above-mentioned driving element,
Above-mentioned Drive and Control Circuit generates the proportional driving signal of detected value with the said temperature transducer.
6. brushless motor, this brushless motor has:
Solenoid;
Permanent magnet;
Drive and Control Circuit, it has the driving element that electric current is provided to above-mentioned solenoid, generates the driving signal that drives above-mentioned solenoid;
Magnetic Sensor, it detects the distance between above-mentioned solenoid and the above-mentioned permanent magnet; And
Temperature sensor, it detects the temperature of above-mentioned driving element,
Above-mentioned Drive and Control Circuit generates the driving signal according to the detected value of above-mentioned Magnetic Sensor and the detected value of said temperature transducer.
7. according to claim 5 or 6 described brushless motors, wherein, above-mentioned brushless motor has a plurality of above-mentioned solenoids and a plurality of above-mentioned permanent magnet.
8. the described brushless motor of any one according to claim 5～7, wherein, above-mentioned Magnetic Sensor detects distance between above-mentioned solenoid and the above-mentioned permanent magnet as magnitude of voltage, and the said temperature transducer detects the temperature of above-mentioned solenoid as magnitude of voltage.
9. the described brushless motor of any one according to claim 5～8, wherein, the said temperature transducer is included in the power semiconductor that above-mentioned driving element is installed.
10. brushless motor according to claim 9, wherein, the said temperature sensor setting is in being located at the thermal component of above-mentioned driving element.
11. a brushless motor, this brushless motor has:
Solenoid;
Permanent magnet;
Drive and Control Circuit, it generates the driving signal that drives above-mentioned solenoid;
Magnetic Sensor, it detects the distance between above-mentioned permanent magnet and the above-mentioned solenoid; And
Temperature sensor, it detects the temperature of above-mentioned brushless motor,
Above-mentioned Drive and Control Circuit rounds after this three of command value of the operation voltage of the detected value of the detected value of above-mentioned Magnetic Sensor, said temperature transducer and above-mentioned brushless motor is multiplied each other.
12. a brushless motor, this brushless motor has:
Coil column with a plurality of solenoids;
Magnet row with a plurality of permanent magnets;
Magnetic Sensor, it detects the relative position of above-mentioned magnet row and above-mentioned coil column;
Drive and Control Circuit, it utilizes the output of above-mentioned Magnetic Sensor, drives above-mentioned coil column with driving element; And
Temperature sensor, it detects the detected object temperature that any one party in the temperature with the temperature of the coil of above-mentioned coil column and above-mentioned driving element is associated,
When the detected object temperature that is detected by the said temperature transducer had surpassed the 1st threshold value of regulation, above-mentioned Drive and Control Circuit reduced the virtual value of the driving voltage that offers above-mentioned coil column,
Above-mentioned Drive and Control Circuit has drive signal generation circuit, and this drive signal generation circuit generates controls the driving signal that a plurality of driving elements of electric current are provided to above-mentioned coil column,
Above-mentioned drive signal generation circuit has:
Temperature monitor circuit, it generates the temperature monitoring signal that signal level changes along with above-mentioned detected object temperature according to the output of said temperature transducer; And
The waveform signal generating unit, it is at least according to the output of said temperature supervisory signal and above-mentioned Magnetic Sensor, generation is expressed the variation identical with the analog variation of the output of above-mentioned Magnetic Sensor and is had waveform signal with the proportional amplitude of signal level of said temperature supervisory signal
Above-mentioned waveform signal generating unit has multiplier, and this multiplier rounds after the command value of the output of above-mentioned Magnetic Sensor, above-mentioned operation voltage and this three of said temperature supervisory signal are multiplied each other, and generates above-mentioned waveform signal.
13. brushless motor according to claim 12, wherein, above-mentioned drive signal generation circuit has pwm control circuit, this pwm control circuit is carried out the PWM control that utilizes above-mentioned waveform signal, generates and expresses the above-mentioned driving signal that the virtual voltage identical with the variation of above-mentioned waveform signal changes.
14. according to claim 12 or 13 described brushless motors, wherein, when above-mentioned Drive and Control Circuit has surpassed the 2nd threshold value greater than the regulation of above-mentioned the 1st threshold value in above-mentioned detected object temperature, stop to provide driving voltage to above-mentioned coil column.
15. according to claim 12 or 13 described brushless motors, wherein, the said temperature transducer is included in the power semiconductor that above-mentioned driving element is installed.
16. according to claim 12 or 13 described brushless motors, wherein, the said temperature sensor setting is in being located at the thermal component of above-mentioned driving element.
17. a device, this device has:
The described brushless motor of any one in the claim 1～16; And
Driven parts by above-mentioned brushless motor driving.
18. device according to claim 17, wherein, said apparatus is moving body.
19. device according to claim 17, wherein, said apparatus is electronic equipment.
20. device according to claim 17, wherein, said apparatus is projecting apparatus.
21. device according to claim 17, wherein, said apparatus is to have the fuel cell using device that the fuel cell of power supply is provided to above-mentioned brushless motor.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-253083 | 2006-09-19 | ||
| JP2006253083 | 2006-09-19 | ||
| JP2006330431 | 2006-12-07 | ||
| JP2006-330431 | 2006-12-07 | ||
| JP2007099543A JP5168988B2 (en) | 2006-09-19 | 2007-04-05 | Brushless motor and control method thereof |
| JP2007-099543 | 2007-04-05 | ||
| JP2007-117234 | 2007-04-26 | ||
| JP2007117234A JP4998070B2 (en) | 2007-04-26 | 2007-04-26 | Brushless motor |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101533728A Division CN101150278B (en) | 2006-09-19 | 2007-09-18 | Brushless motor |
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| CN102983798A true CN102983798A (en) | 2013-03-20 |
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| CN2007101533728A Expired - Fee Related CN101150278B (en) | 2006-09-19 | 2007-09-18 | Brushless motor |
| CN2012104602345A Pending CN102983798A (en) | 2006-09-19 | 2007-09-18 | Brushless motor and device with same |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101533728A Expired - Fee Related CN101150278B (en) | 2006-09-19 | 2007-09-18 | Brushless motor |
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| CN105453415A (en) * | 2013-06-13 | 2016-03-30 | 戴森技术有限公司 | Reducing the power consumption of a brushless motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102195548A (en) * | 2010-03-05 | 2011-09-21 | 建准电机工业股份有限公司 | Motor system |
| JP5276700B2 (en) * | 2011-09-21 | 2013-08-28 | ファナック株式会社 | Motor overheat prevention device for motor and motor control device |
| US9352656B2 (en) * | 2012-08-31 | 2016-05-31 | Ford Global Technologies, Llc | Temperature based electric machine control |
| US8933658B2 (en) * | 2013-01-08 | 2015-01-13 | Honeywell International Inc. | Thermal protection method and system to maximize availability of electric drive system |
| US9245540B1 (en) * | 2014-10-29 | 2016-01-26 | Western Digital Technologies, Inc. | Voice coil motor temperature sensing circuit to reduce catastrophic failure due to voice coil motor coil shorting to ground |
| JP2016226153A (en) * | 2015-05-29 | 2016-12-28 | 株式会社東芝 | Motor drive circuit |
| WO2020240615A1 (en) * | 2019-05-24 | 2020-12-03 | 日本電信電話株式会社 | Electronic apparatus and control method |
| CN110932626B (en) * | 2019-12-05 | 2021-06-18 | 国网冀北电力有限公司电力科学研究院 | Auxiliary limit control method and device for alternating current excitation system of variable-speed pumping and storage unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1156346A (en) * | 1995-10-20 | 1997-08-06 | 株式会社杰克赛尔 | Method and device for driving DC. brushless motor |
| DE19919462A1 (en) * | 1999-04-29 | 2000-11-02 | Bosch Gmbh Robert | Electronically commutable motor, especially for a liquid pump |
| JP3694614B2 (en) * | 1999-06-04 | 2005-09-14 | 株式会社日立製作所 | Air conditioner and brushless motor control device |
| US6434505B1 (en) * | 1999-10-15 | 2002-08-13 | Atecs Mannesmann Ag | Method for determining the instantaneous winding temperature of the stator winding of a three-phase AC motor, in particular a pole-changeable asynchronous motor |
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2007
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| CN105453415A (en) * | 2013-06-13 | 2016-03-30 | 戴森技术有限公司 | Reducing the power consumption of a brushless motor |
| CN105453415B (en) * | 2013-06-13 | 2018-06-08 | 戴森技术有限公司 | Reduce the power consumption of brushless motor |
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| CN101150278A (en) | 2008-03-26 |
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Application publication date: 20130320 |