CN101383575A - Determining device and method for step motor stop state - Google Patents
Determining device and method for step motor stop state Download PDFInfo
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- CN101383575A CN101383575A CNA2007101491693A CN200710149169A CN101383575A CN 101383575 A CN101383575 A CN 101383575A CN A2007101491693 A CNA2007101491693 A CN A2007101491693A CN 200710149169 A CN200710149169 A CN 200710149169A CN 101383575 A CN101383575 A CN 101383575A
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Abstract
The invention discloses a judging device and a judging method for judging the stopping and rotating states of a step motor. The device is applied to the step motor with at least two stator windings and a rotor, and is characterized in that the continuous clock pulses of at least two different phases are respectively produced through a driving module, and are sent to the two stator windings, so as to enable the rotor to run and let the stator windings to produce back electromotive force with intervals in turn, then a control module, the threshold voltage of which is preset, is used for alternately inputting a sensing time interval to the driving module in a way of corresponding to the continuous clock pulses of at least two different phases, so as to enable a sensing module to sense out the back electromotive force produced by the stator windings according to the sensing time interval, and carry out the comparison between the back electromotive force and the threshold voltage, thereby letting the control module to judge the stopping and rotating states of the step motor when the back electromotive force is lower than the threshold voltage, and correspondingly outputting a stopping and rotating state signal, so that not only the problems that a micro switch is usually required to be added and the space of the original step motor control system is occupied are solved, but also the cost in structural design and added elements is saved.
Description
Technical field
The present invention relates to a kind of judgment means and determination methods of step motor stop state, more detailed it, relate to a kind of judgment means and determination methods that is applied to have the stepping motor of at least two stator winding and a rotor.
Background technology
Stepping motor (stepping motor) is because its control mode is very simple, so present speed, displacement and the direction that has been widely used in the various control system with the control load device.And the difference of stepping motor and general motor is, when stepping motor input power supply, can't make its rotor (rotor) produce periodical rotation, be that stepping motor is a kind of electromechanics device of accepting Digital Signals, and ceaselessly switch alternately to drive rotor via the magnetic field of stator (stator) top electrode (pole) and to rotate, and when digital clock signal pulse of input, can make the fixed angle of rotor rotation of stepping motor that is known step angle (stepping angle).Owing to stepping motor can directly be accepted digital signal and produces corresponding angle and change, just pulse wave number and output angle are directly proportional, so as long as in controlled range, stepping motor can drive by open loop (open loop) mode, needn't consider to feed back (feedback) and can finish control operation simply.
See also Fig. 1, be the block schematic diagram of known step motor control system.As shown in the figure, this step motor control system 10 comprises control interface 11, control unit 12, driver element 13, stepping motor 14, and power supply unit 15.Wherein, this control interface 11 can be arranged at computer system or programmable logic controller (PLC) (Programmable logic controller, PLC) in, and this control interface 11 is to be used for exporting a high-order instruction (high-level command) to control unit 12, and for example this stepping motor system 10 is arranged in the CD-ROM device (optical disk drive) and seeks rail (track seeking) operation with control optical read-write head (optical pick up head).Therefore this control unit 12 can be directly imported the orbit information of required access at this control interface 11, correspondingly produce control signal to control this driver element 13 by this control unit 12 again, make this driver element 13 according to this control signal output current to drive this stepping motor 14, that is utilize coil (winding) winding on the stator electrode of this stepping motor 14 of current drives to drive corresponding rotor to produce required magnetic field, be installed in after this epitrochanterian optical read-write head is positioned to track required on the CD-RW discsCD-RW, make this optical read-write head read information on this track again, driver element 13 required current powers are provided by this power supply unit 15 in addition.
But, in the step motor control technology of prior art, for whether the rotor of further determining stepping motor has turned to the desired position, for example determine whether the above-mentioned optical read-write head that is installed in the rotor of this stepping motor 14 is positioned initial position really before reading CD-RW discsCD-RW, set up a micro switch usually and detected.This measure has occupied the space of whole step motor control system undoubtedly, and has correspondingly increased on the mechanism design and the cost of micro switch.
Thus, how a kind of cost of saving on the mechanism design and setting up element (as micro switch) is provided, and need not to take former step motor control system space, can judge exactly whether the rotor of stepping motor has turned to the judgment means and the determination methods of the step motor stop state of desired location, real is problem demanding prompt solution in present this industrial circle.
Summary of the invention
In view of the shortcoming of above-mentioned prior art, one object of the present invention is to provide a kind of judgment means and determination methods of step motor stop state, with design and the cost of simplifying the internal structure of an organization.
Another object of the present invention is to provide a kind of feedback system detecting the stepping motor whether judgment means and determination methods of the step motor stop state of stall utilized.
For reaching above-mentioned and other purpose, the judgment means of step motor stop state provided by the present invention is applied to have the stepping motor of at least two stator winding and a rotor.The judgment means of this stepping motor comprises at least: a driver module, electrically connect this at least two stator winding respectively, in order to producing the continuous clock pulse of at least two outs of phase respectively, and make these stator winding intermittently produce back electromotive force in regular turn by this rotor running; A detecting module electrically connects this driver module; And control module, electrically connect this driver module and this at least two stator winding respectively, in order to alternately to should at least two the continuous clock pulses input detecting periods of out of phase to this driver module, and default threshold voltage, detect the back electromotive force that this at least two stator winding are produced to make this detecting module according to this detecting period, thereby work as the back electromotive force of being detected when being lower than threshold voltage, this control module judges that promptly this stepping motor is a stop state, and stop state signal of corresponding output.
The judgment means of corresponding above-mentioned step motor stop state, the determination methods of step motor stop state of the present invention may further comprise the steps:
Produce one first continuous clock pulse in regular turn according to first current potential and second current potential and export this first stator winding to.
Produce one second continuous clock pulse in regular turn according to first current potential and second current potential and export this second stator winding to, wherein this second continuous clock pulse and this first continuous clock pulse out of phase.
When the phase place of the first continuous clock pulse or the second continuous clock pulse is second current potential, then to should the first continuous clock pulse and this second continuous detecting period of clock pulse input, to detect this first stator winding or second stator winding according to this detecting period by back electromotive force that rotor rotation was produced, when if back electromotive force is lower than a threshold voltage, judge that promptly this stepping motor is a stop state, and stop state signal of corresponding output.
The judgment means and the determination methods of corresponding above-mentioned step motor stop state, wherein this driver module in this detecting period respectively alternately to should at least two stator winding a high impedance output is provided, the corresponding back-emf that produces can be left in the basket because of too small, and erroneous judgement is stop state.
Therefore, the invention provides a kind of judgment means and determination methods of step motor stop state, it mainly is by detect the back electromotive force (BEMF) that a stepping motor is produced when turning round, and, whether be in stop state to judge this stepping motor by coming comparison with a default reference voltage.Promptly work as the back electromotive force of being detected when being lower than reference voltage, judge that promptly this stepping motor is a stop state, and stop state signal of corresponding output.Compared to existing technologies, the present invention need not to take the space of former step motor control system, and can save on the mechanism design and the cost of setting up element (as: micro switch), therefore reaches above-mentioned all purposes.
Description of drawings
Fig. 1 is a block schematic diagram, and it shows the basic framework block schematic diagram of the judgment means of existing step motor stop state;
Fig. 2 is a block schematic diagram, and it shows the basic framework block schematic diagram of the judgment means of step motor stop state of the present invention;
Fig. 3 is a detecting sequential chart, and it shows the judgment means stall detecting sequential chart of step motor stop state of the present invention;
Fig. 4 is a detecting flow chart, in order to the detecting flow chart of judgment means of explanation step motor stop state of the present invention; And
Fig. 5 is a block schematic diagram, is implemented in the enforcement configuration diagram of a DAA in order to the judgment means of explanation step motor stop state of the present invention.
[simple declaration of element numbers]
10 existing stepping motor systems
11 control interfaces
12 control units
13 driver elements
14 stepping motors
15 power supply units
20 judgment means
21 driver modules
211 clock pulse generation units
212 driver elements
212a, 212b first output
212c, 212d second output
212e, 212f input
22 detecting modules
221 first detectors
222 second detectors
221a, 221b, 222a, 222b input
23 control modules
231 analog-digital converters
30 control interfaces
40 DAAs
50 optical read-write heads
A first stator winding
B second stator winding
The R rotor
The A_in first continuous clock pulse
The B_in second continuous clock pulse
U1_Out first output signal
U2_Out second output signal
S1～S5 step
Embodiment
Below be by particular specific embodiment explanation embodiments of the present invention, be familiar with those of ordinary skill in the art and can understand other advantages of the present invention and effect easily by the content that this specification disclosed.The present invention also can be implemented or be used by other different specific embodiments, and the every details in this specification also can be carried out various modifications and change based on different viewpoints and application under not departing from spirit of the present invention.
Following embodiment further describes viewpoint of the present invention, but is not to limit category of the present invention anyways.
Consult Fig. 2, it is in order to the basic framework block schematic diagram of the judgment means of explanation step motor stop state of the present invention.As shown in the figure, this judgment means 20 comprises at least: driver module 21, detecting module 22 and control module 23.By detecting back electromotive force (the Back ElectroMotive Force that stepping motor is produced in the running; Whether be stop state, and stop state signal of corresponding output if BEMF) differentiating.And in the present embodiment, this stepping motor comprises one first stator winding A, second a stator winding B and a rotor R, but the application is to be example with the two-phase stepper motor, and in fact stator winding is not as limit, and the number of phases of promptly any even number and multiple thereof all can.
This driver module 21 comprises clock pulse generation unit 211 and driver element 212.This driver element 212 has the first output 212a, 212b and the second output 212c, 212d, wherein this first output 212a, 212b are in order to electrically connect this first stator winding A, and this second output 212c, 212d are in order to electrically connect this second stator winding B; 211 of this clock pulse generation units electrically connect this driver element 212, respectively the first stator winding A and the second stator winding B are produced the continuous clock pulse of out of phase.
This detecting module 22 comprises first detector 221 and second detector 222.Input 221a, the 221b of this first detector electrically connects the first output 212a, the 212b that this driver element 212 is connected with this first stator winding A respectively; Input 222a, the 222b of this second detector 222 then electrically connects the second output 212c, the 212d that this driver module 212 is connected with this second stator winding B respectively, in order to detect the back electromotive force (BEMF) of this first stator winding A or this second stator winding B.
This control module 23 electrically connects the output 221c of this first detector 221 and the output 222c of this second detector 222 respectively.And this control module 23 correspondingly is electrically connected to one of them input 212e of this driver module 212 by this output 221c, and correspondingly be electrically connected to another input 212f of this driver module 212 by this output 222c, in order to alternately the period is detected in one of the continuous clock pulse input of these outs of phase, to detect the back electromotive force (BEMF) that the first stator winding A or the second stator winding B are exported respectively.And this control module is preset a threshold voltage (Threshold voltage), (BEMF) compares program with this back electromotive force, thereby work as back electromotive force (BEMF) voltage of being detected when being higher than predetermined threshold value voltage, this control module 23 judges that promptly this stepping motor is an operating condition, and operating condition signal of corresponding output; And work as back electromotive force (BEMF) voltage of being detected when being lower than predetermined threshold value voltage, this control module 23 judges that promptly this stepping motor is a stop state, and stop state signal of corresponding output, wherein this driver module in this detecting period respectively alternately to should at least two stator winding a high impedance output is provided, the corresponding back electromotive force that produces can be left in the basket because of too small, and erroneous judgement is stop state.
In addition, also comprise analog-digital converter 231 (Analog todigital converter) in this control module 23, the analog signal conversion that is produced in order to first detector 221 and second detector 222 with this detecting module 22 becomes digital data stream (Data stream), in order to these continuum of states signals are exported to a system (figure does not show).
Consult Fig. 3, it is in order to judgment means detecting sequential chart of explanation step motor stop state of the present invention, with show respectively the signal condition of the driver module of being detected 21 input 212e, 212f and control module 23 outputs.As shown in the figure, the continuous clock pulse that this driver module 21 is produced is the continuous phase combination of one first current potential (present embodiment is preset as 5V and 0V respectively) and one second current potential (present embodiment is preset as 2.5V), promptly when this clock pulse generation module produces one first continuous clock pulse A_in in regular turn and exports the first stator winding A to according to this first current potential and this second current potential, can be again produce one second continuous clock pulse B_in in regular turn according to aforesaid this first current potential and this second current potential and export the second stator winding B to fall behind a phase place, and this first stator winding A correspondingly produces one first output signal U 1_Out by this first detector 221, this second stator winding B then correspondingly produces one second output signal U 2_Out by this second detector 222, to should the first continuous clock pulse A_in and second continuous detecting period of clock pulse B_in input, and carry out the comparison program of this back electromotive force and this threshold voltage in order to alternately.
This comparison program comprises the following steps:
(1) when the sequential of these continuous clock pulses is T3, this second stator winding B exports first current potential and makes the rotor R running, make the first stator winding A of adjacent this second stator winding B export second current potential relatively, promptly the first stator winding A no current flows through, make this first stator winding A in the T3 phase place of the second output signal U 1_Out by the rotor R running, produce a back electromotive force greater than threshold voltage (BEMF) relatively, show that this stepping motor still is in operating condition this moment.
(2) when the sequential of these continuous clock pulses is T4, this first stator winding A exports first current potential and makes the rotor R running, this second stator winding B then exports second current potential, promptly the second stator winding B no current flows through, make this second stator winding B in the T4 phase place of the first output signal U 2_Out by the rotor R running, produce one relatively greater than threshold voltage back electromotive force (BEMF), show that this stepping motor still is in operating condition this moment.
(3) when the sequential of these continuous clock pulses is T7, this first stator winding A exports second current potential, this second stator winding B then exports first current potential, but since this first stator winding A does not have the generation of back electromotive force (BEMF) in the T7 phase place of the first output signal U 1_Out or the back electromotive force (BEMF) that produced less than threshold voltage, so the time show that this stepping motor is in stop state.
Consult Fig. 4, it is in order to the detecting flow chart of the judgment means of explanation step motor stop state of the present invention.As shown in the figure, at first in step S1, define one first current potential and second current potential, and at a memory of the systemic presupposition of being exported section, this memory section definition step motor stop flag (Motor stop flag), when this stepping motor still is shown as in the running " Lo " (electronegative potential), and when step motor stop, be shown as " Hi " (high potential), then proceed to step S2.
In step S2, produce continuous clock pulse according to aforesaid first current potential and second current potential respectively.In detail, produce one first continuous clock pulse A_in in regular turn according to aforesaid first current potential and second current potential and export the first stator winding A to, and produce one second continuous clock pulse B_in in regular turn according to aforesaid first current potential and second current potential and export the second stator winding B to, thereby when the second continuous clock pulse falls behind odd number phase place of this first continuous clock pulse, alternately to should the first continuous clock pulse A_in and second continuous detecting period of clock pulse B_in input, and carry out the comparison program of this back electromotive force and this threshold voltage.
In step S3, detect the back electromotive force (BEMF) of the second stator winding B, and judge that whether back electromotive force (BEMF) that the second stator winding B produced is greater than threshold voltage, promptly when the first continuous clock pulse A_in be positioned at mutually first current potential and the second continuous impulse B_in be positioned at second current potential mutually the time, detect the back electromotive force (BEMF) that the second stator winding B produced and judge whether according to this, if then proceed to step S4 greater than threshold voltage, if not, then proceed to step S5.
In step S4, detect the back electromotive force (BEMF) of the first stator winding A, and judge that whether back electromotive force (BEMF) that the first stator winding A produced is greater than threshold voltage, promptly when the first continuous clock pulse A_in be positioned at mutually second current potential and the second continuous clock pulse B_in be positioned at first current potential mutually the time, detect the first stator winding A and whether whether produce back electromotive force (BEMF), if then get back to step S2 greater than threshold voltage, if not, then proceed to step S5.
In step S5, changing the step motor stop flag is " Hi ", to show that this stepping motor is a stop state, wherein this detecting period is respectively alternately to providing a high impedance output by at least two stator winding, make the corresponding back electromotive force that produces can not be stop state and be left in the basket to judge by accident because of too small.
Consult Fig. 5, its judgment means in order to explanation step motor stop state of the present invention is implemented in the enforcement configuration diagram of DAA.As shown in the figure, this judgment means 20 except as above-mentioned embodiment in respectively by driver module 21 and the detecting comparison module 22 electrically connect first of stepping motor 14 respectively, two stator winding A, B, and provide beyond the driver module 21 required drive current power by power supply unit 15, also comprise control interface 30, DAA 40 and lift-launch are to the optical read-write head 50 (optical pick up header) of this DAA 40, wherein this control interface 30 electrically connects this judgment means 20 and this optical read-write head 50 respectively, 50 of this optical read-write heads are arranged on the rotor R of this stepping motor, and this DAA 40 can be CD-ROM, DVD or Combo.
When the phase place of the first continuous clock pulse A_in or the second continuous clock pulse B_in is second current potential, the first stator winding A is compared in detecting in regular turn or the second stator winding B rotates the back electromotive force that is produced by rotor R, and carries out the comparison program of this back electromotive force and this threshold voltage.When if back electromotive force is lower than threshold voltage, this judgment means 20 judges that promptly this stepping motor is a stop state, and status signal of corresponding output is to this control interface 30, make this control interface read write command of 30 corresponding inputs control signal to this optical read-write head 50, to make this optical read-write head 50 begin this DAA 40 is carried out read-write program, therefore, not only can avoid known palpus to install the problem in the shared former step motor control system of micro switch space in addition, more can save on the mechanism design and the cost of setting up element (as: micro switch).
In sum, the invention provides a kind of judgment means and determination methods of step motor stop state, it mainly is the back electromotive force (BEMF) that is produced when turning round by the detecting stepping motor, and by coming comparison with a preset threshold value voltage, to judge whether this stepping motor is in stop state, promptly work as the back electromotive force of being detected when being lower than threshold voltage, judge that promptly this stepping motor is a stop state, and stop state signal of corresponding output, compared to existing technologies, the present invention need not to take the space of former step motor control system, and can save on the mechanism design and the cost of setting up element (as: micro switch).
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any be familiar with those of ordinary skill in the art all can be under spirit of the present invention and category, the foregoing description is modified and is changed.Therefore, the scope of the present invention should be listed as claim.
Claims (13)
1. the judgment means of a step motor stop state is applied to have the stepping motor of at least two stator winding and a rotor, and the judgment means of this step motor stop state comprises at least:
Driver module electrically connects this at least two stator winding respectively, gives these at least two stator winding in order to the continuous clock pulse that produces at least two outs of phase respectively, so that this rotor turns round and make these at least two stator winding intermittently produce back electromotive force in regular turn;
Detecting module electrically connects this driver module and this at least two stator winding, in order to detect the back electromotive force that this at least two stator winding produce; And
Control module, electrically connect this driver element and this detecting module, in order to alternately to should at least two continuous detecting periods of clock pulses input of out of phase to this driver module, and be preset with a threshold voltage, detect the back electromotive force that this at least two stator winding are produced to make this detecting module according to this detecting period, and carry out the comparison program of this back electromotive force and this threshold voltage, thereby when this back electromotive force is lower than this threshold voltage, this control module judges that promptly this stepping motor is a stop state, and stop state signal of corresponding output.
2. the judgment means of step motor stop state as claimed in claim 1, wherein, this driver module comprises at least:
The clock pulse generation unit is in order to produce continuous clock pulse; And
Driver element electrically connects this clock pulse generation module, this control module and this at least two stator winding respectively, in order to encourage one of them stator winding according to continuous clock pulse, makes this rotor running produce a back electromotive force to another adjacent stator winding.
3. the judgment means of step motor stop state as claimed in claim 1, wherein, this driver module is detected the period in this, respectively alternately to providing a high impedance output by at least two stator winding.
4. the judgment means of step motor stop state as claimed in claim 1 or 2, wherein, the consecutive hours pulse-phase difference odd number phase place of any two outs of phase.
5. the judgment means of step motor stop state as claimed in claim 1 or 2, wherein, these continuous clock pulses are the continuous phase combination of one first current potential and one second current potential.
6. the judgment means of step motor stop state as claimed in claim 5, wherein, this first current potential is accurate forward or backwards position.
7. the judgment means of step motor stop state as claimed in claim 5, wherein, this second current potential is in order to producing an intermittently sequential, the back electromotive force that turns round and produced because of rotor for this corresponding stator winding of detecting module detecting institute.
8. the judgment means of step motor stop state as claimed in claim 1, wherein, this stepping motor carries the optical read-write head to DAA.
9. the determination methods of a step motor stop state is applied to have the stepping motor of at least two stator winding and a rotor, and the determination methods of this step motor stop state may further comprise the steps:
Produce one first continuous clock pulse in regular turn according to one first current potential and one second current potential and export this first stator winding to;
Produce one second continuous clock pulse in regular turn according to one first current potential and one second current potential and export this second stator winding to, wherein this second continuous clock pulse and this first continuous clock pulse out of phase;
When the phase place of the first continuous clock pulse or the second continuous clock pulse is second current potential, then to should the first continuous clock pulse and this second continuous detecting period of clock pulse input, to detect this first stator winding or second stator winding according to this detecting period by back electromotive force that rotor rotation was produced, when if back electromotive force is lower than a threshold voltage, judge that promptly this stepping motor is a stop state, and corresponding output one stop state signal.
10. the determination methods of step motor stop state as claimed in claim 9, wherein, this detecting period is respectively alternately to providing a high impedance output by at least two stator winding.
11. the determination methods of step motor stop state as claimed in claim 9, wherein, this first continuous clock pulse and the second consecutive hours pulse-phase difference odd number phase place.
12. the determination methods of step motor stop state as claimed in claim 9, wherein, this first current potential is accurate forward or backwards.
13. the determination methods of step motor stop state as claimed in claim 9, wherein, this second current potential is in order to producing an intermittently sequential, detects the back electromotive force that pairing first stator winding or second stator winding are produced because of the rotor running for this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101491693A CN101383575A (en) | 2007-09-05 | 2007-09-05 | Determining device and method for step motor stop state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101491693A CN101383575A (en) | 2007-09-05 | 2007-09-05 | Determining device and method for step motor stop state |
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| CN101383575A true CN101383575A (en) | 2009-03-11 |
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| CNA2007101491693A Pending CN101383575A (en) | 2007-09-05 | 2007-09-05 | Determining device and method for step motor stop state |
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| CN101988951A (en) * | 2009-07-29 | 2011-03-23 | 山洋电气株式会社 | Method of inspecting motor condition and device for inspecting motor characteristics |
| CN102324884A (en) * | 2011-07-08 | 2012-01-18 | 三一重机有限公司 | Stepper motor feedback voltage protection scheme for engineering machinery |
| CN102621490A (en) * | 2011-01-27 | 2012-08-01 | 山洋电气株式会社 | Motor condition inspection method and motor characteristic inspecting device |
| CN103092091A (en) * | 2011-10-27 | 2013-05-08 | 爱吉尔电子股份公司 | A method and a device for opening and subsequently closing a weft brake in a thread feeder |
| CN103647429A (en) * | 2013-12-24 | 2014-03-19 | 邹九大 | Intermittent movement type strong magnetic motor |
| CN104467345A (en) * | 2013-09-20 | 2015-03-25 | 卡西欧计算机株式会社 | Stepping motor and timepiece provided with stepping motor |
| CN104660138A (en) * | 2013-11-20 | 2015-05-27 | 广东美的制冷设备有限公司 | Zero-speed protective device and zero-speed detection method for permanent magnet synchronous motor |
| CN113422540A (en) * | 2021-06-28 | 2021-09-21 | 峰岧科技(上海)有限公司 | Motor initial state detection device and motor initial state detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101988951A (en) * | 2009-07-29 | 2011-03-23 | 山洋电气株式会社 | Method of inspecting motor condition and device for inspecting motor characteristics |
| CN102621490B (en) * | 2011-01-27 | 2016-02-17 | 山洋电气株式会社 | The situation inspection method of motor and motor characteristic testing fixture |
| CN102621490A (en) * | 2011-01-27 | 2012-08-01 | 山洋电气株式会社 | Motor condition inspection method and motor characteristic inspecting device |
| CN102324884A (en) * | 2011-07-08 | 2012-01-18 | 三一重机有限公司 | Stepper motor feedback voltage protection scheme for engineering machinery |
| CN103092091B (en) * | 2011-10-27 | 2017-04-05 | 爱吉尔电子股份公司 | The method and apparatus opened and be then turned off weft brake in thread feeder |
| CN103092091A (en) * | 2011-10-27 | 2013-05-08 | 爱吉尔电子股份公司 | A method and a device for opening and subsequently closing a weft brake in a thread feeder |
| CN104467345A (en) * | 2013-09-20 | 2015-03-25 | 卡西欧计算机株式会社 | Stepping motor and timepiece provided with stepping motor |
| CN104467345B (en) * | 2013-09-20 | 2017-07-14 | 卡西欧计算机株式会社 | Stepper motor and the clock and watch for possessing the motor |
| CN104660138A (en) * | 2013-11-20 | 2015-05-27 | 广东美的制冷设备有限公司 | Zero-speed protective device and zero-speed detection method for permanent magnet synchronous motor |
| CN104660138B (en) * | 2013-11-20 | 2018-09-11 | 广东美的制冷设备有限公司 | The zero-speed protective device and zero-speed detection method of permanent magnet synchronous motor |
| CN103647429A (en) * | 2013-12-24 | 2014-03-19 | 邹九大 | Intermittent movement type strong magnetic motor |
| CN103647429B (en) * | 2013-12-24 | 2016-03-30 | 邹九大 | A kind of intermittent movement type strong magnetic motor |
| CN113422540A (en) * | 2021-06-28 | 2021-09-21 | 峰岧科技(上海)有限公司 | Motor initial state detection device and motor initial state detection method |
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