CN207200603U - Electric tool brshless DC motor impacting start system - Google Patents
Electric tool brshless DC motor impacting start system Download PDFInfo
- Publication number
- CN207200603U CN207200603U CN201721116686.6U CN201721116686U CN207200603U CN 207200603 U CN207200603 U CN 207200603U CN 201721116686 U CN201721116686 U CN 201721116686U CN 207200603 U CN207200603 U CN 207200603U
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- motor
- current
- start system
- inverter
- brshless
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Abstract
The utility model discloses a kind of electric tool brshless DC motor impacting start system, including the inverter (2) electrically connected with motor (1), the position sensor (3) being placed on motor (1) end cap, and the controller (4) being electrically connected with the inverter (2) and position sensor (3).Electric tool brshless DC motor impacting start system of the present utility model, component power grade is not increased, switching tube is hardly damaged, machine winding caloric value is small.
Description
Technical field
The utility model belongs to brushless DC electromotor start and moves control technology field, and particularly one kind does not increase component power
The electric tool brshless DC motor impacting start system that grade, switching tube are hardly damaged, machine winding caloric value is small.
Background technology
Electric tool largely uses brshless DC motor.
Traditional brshless DC motor control is according to load characteristic, drafts current chopping limit using copped wave limit method is determined,
In single commutating period, electric current keeps continuous.This control method can produce more smooth electromagnetic torque with driving load, just
Often there are higher efficiency, less torque pulsation during work.But because the situation of stall often occurs in electric tool, just need
Electric tool brshless DC motor is wanted to have the torque of an overrate on startup.In order that motor can have high pulling torque realization
Start, overcome stall, it is necessary to make machine winding have instantaneous high current to produce a larger electromagnetic torque.When this electromagnetism turns
When square is more than locked-rotor torque, you can rotate motor.After motor rotates, that is, depart from locked rotor condition, into normal work shape
State,.The problems such as above-mentioned conventional method can make operating current overrate, bring switching tube to damage, and machine winding caloric value is big.
To avoid the high current of motor rotation blockage from causing damage device, the problem of caloric value is excessive, can also use be resistant to it is bigger
The device of electric current.But this understands significantly larger production volume and increase manufacturing cost.
Therefore, the problem of prior art is present be：Because electric tool brshless DC motor locked rotor current is big, do not increasing
The problem of switching tube damages, machine winding caloric value is excessive can be caused on the premise of component.
The content of the invention
The purpose of this utility model is to provide a kind of electric tool brshless DC motor impacting start system, does not increase member
Device power grade, switching tube are hardly damaged, machine winding caloric value is small.
The technical solution for realizing the utility model purpose is：
A kind of electric tool brshless DC motor impacting start system, including electrically connected with motor 1 inverter 2, be placed in
Position sensor 3 on the end cap of motor 1, and the controller 4 being electrically connected with the inverter 2 and position sensor 3；
The position sensor 3 is used to determine motor rotor position, obtains motor speed to distinguish the startup work of motor
State；
The controller 4 is used for the startup working condition that motor is judged according to motor speed in start-up course, and according to electricity
The different starting states of machine, control inverter 2 produces the continuous current that the upper limit is constant in a cycle or segmentation pulse current respectively
Waveform；
The inverter 2 is used for the control signal according to controller 4, produces different electric machine phase current waveforms, driving electricity
Machine 1 rotates.
Compared with prior art, its remarkable advantage is the utility model：
1st, volume does not increase：The utility model in the case of stall is run into, enables the system to ensureing by Pulse Width Control
In the case of component safety, a larger pulse current is produced, makes motor that there is larger torque, overcomes stall, realized
Impact type starts, and realizes that heavy load starts by the device of smaller quota, and the device of more high current is resistant to without using, so as to
Ensure the body of original device, manufacturing cost will not also be significantly increased；
2nd, element is hardly damaged：When stall starts, using pulse current form, make electric current that there is the pulse of amplitude to make
Motor has larger electromagnetic torque, while has switching tube shut-off to make the period that electric current is zero, makes current average or mean-square value
Meet each component upper limit, to protect each component to be hardly damaged；, can be by inquiring about manufacturer for the protection of power tube
The tables of data of offer obtains parameter, power tube allow by current value will increase with the reduction of ON time or dutycycle.
According to above-mentioned two parameters, the amplitude and pulse width of pulse current are calculated, you can ensure overcoming in the case of device safety
Stall, realize that pulsed starts.
3rd, machine winding caloric value is small：When motor rotation blockage, the loss of motor is mainly copper loss, i.e., the heating of whole motor
Amount is mainly derived from the heating of winding internal resistance, its heating power and electric current it is square directly proportional.Make electric current root mean square in a cycle
Equal to the reliable use that rated value can ensure machine winding.
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model electric tool brshless DC motor impacting start system.
Fig. 2 is the Booting sequence figure of electric tool brshless DC motor impacting start system described in Fig. 1.
Fig. 3 is the oscillogram that constant current starts.
Fig. 4 is the oscillogram that pulse current starts.
In figure, 1 motor, 2 inverters, 3 position sensors, 4 controllers.
Embodiment
As shown in figure 1, the utility model electric tool brshless DC motor impacting start system, including be electrically connected with motor 1
The inverter 2 connect, the position sensor 3 being placed on the end cap of motor 1, and it is electric respectively with the inverter 2 and position sensor 3
The controller 4 of connection；
The position sensor 3 is used to determine motor rotor position, obtains motor speed to distinguish the startup work of motor
State；
The controller 4 is used for the startup working condition that motor is judged according to motor speed in start-up course, and according to electricity
The different starting states of machine, control inverter 2 produces the continuous current that the upper limit is constant in a cycle or segmentation pulse current respectively
Waveform；
The inverter 2 is used for the control signal according to controller 4, produces different electric machine phase current waveforms, driving electricity
Machine 1 rotates.
The startup working condition of the motor is divided into normal activation state and locked rotor condition；
When motor speed is less than rotating speed 1000rpm, determine that motor is in locked rotor condition；
When motor speed reaches 1000rpm and the above, determine that motor is in normal activation state.
Generally, the meeting of inverter 2 external direct current power supply, this is professional knowledge, is repeated no more.
As shown in Fig. 2 the startup method of the utility model electric tool brshless DC motor impacting start system, including such as
Lower step：
(10) starting state determines：According to motor speed in start-up course, the startup working condition area for judging motor is just
Normal starting state or locked rotor condition；
When motor speed is less than rotating speed 1000rpm, determine that motor is in locked rotor condition.
When motor speed reaches 1000rpm and the above, determine that motor is in normal activation state.
Judge its working condition by the way that whether the speed of rotor or position change：If rotating speed is too low or position
Almost do not change, be judged as locked rotor condition, otherwise judge that it is in normal work shape if the normal lifting of rotating speed or if reaching stable
State.
In (10) the state estimating step, it is less than expected rotating speed 1000rpm, Huo Zhe when measuring rotor rotating speed
When the position change put in 0.1s on rotor circumference is less than 120 ° of electrical angles, determine that motor is in locked rotor condition.
(20) constant current starts：When motor is in normal activation state, using the continuous current that the upper limit in a cycle is constant
Controlled motor starts；
For normal operating conditions, then using constant current mode of operation, that is, determine electric current limit chop control, make a commutation all
Electric current is continuous in phase, smaller, stable working of pulsing.
(30) pulse current starts：When motor is in locked rotor condition, then use segmentation pulse current controlled motor starts.
(30) the pulse current starting step specifically, using make the phase current upper limit of brushless electric machine it is constant pulse electricity
Stream carrys out the detent torque of controlled motor, so as to which controlled motor starts.The pulse current, refer to electric current constant in phase cycle
Waveform is changed to the pulse current waveform of multiple segmentations.
Power component current protection of the amplitude of the pulse current with pulse temporal width according to brushless motor system
Threshold value or electric tool block torque value determination, or according to heating in winding principle of identity, pulse current amplitude and pulse width
Root mean square is equal to the amplitude of constant current.
Preferably,
In (30) the pulse current starting step, pulse current form control is motor is driven using pulse current,
One cycle of pulse current root mean square is equal to rated value.
Preferably,
The amplitude of the pulse current determines with pulse width according to the component current protection value of systemic presupposition.
For locked rotor condition, controlled motor is used pulse current mode of operation by driver, to overcome stalling torque.According to
The component current protection value of systemic presupposition, determines the amplitude of its current impulse and the width of pulse, has motor larger
Pulse torque, realize that impact type starts.
The utility model control is simple, can realize that heavy load starts by the device of smaller quota, reduce cost, reduce
Volume
Fig. 3 is the oscillogram that constant current starts.
Fig. 4 is the oscillogram that pulse current starts.
In rated operation, using copped wave limit method is determined, machine winding is set to keep continuous flat in a commutating period
It is sliding, so as to have higher efficiency during normal work, less torque pulsation；And on startup, using pulse current form, make electricity
Pulse of the stream with amplitude makes motor with larger electromagnetic torque, while has switching tube shut-off to make the period that electric current is zero,
Current average or mean-square value is set to meet each component upper limit, to protect each component.
When motor rotation blockage, the loss of motor is mainly copper loss, i.e., the caloric value of whole motor is mainly derived from winding
The heating of resistance, its heating power and electric current it is square directly proportional.Control mode is set, electric current root mean square in a cycle is equal to volume
Definite value can ensure the reliable use of machine winding.For the protection of power tube, the data that can be provided by inquiring about manufacturer
Table obtains parameter, power tube allow by current value will increase with the reduction of ON time or dutycycle.According to above-mentioned two
Item parameter, calculate the amplitude and pulse width of pulse current, you can overcome stall in the case of guarantee device safety, realize arteries and veins
Rush formula startup.
Claims (4)
- A kind of 1. electric tool brshless DC motor impacting start system, it is characterised in that：Including the inverter (2) electrically connected with motor (1), the position sensor (3) being placed on motor (1) end cap, and with institute State the controller (4) that inverter (2) and position sensor (3) are electrically connected；The position sensor (3) is used to determine motor rotor position, obtains motor speed to distinguish the startup work shape of motor State；The controller (4) is used for the startup working condition that motor is judged according to motor speed in start-up course, and according to motor Different starting states, control inverter (2) produces the upper limit is constant in a cycle continuous current or segmentation pulse current respectively Waveform；The inverter (2) is used for the control signal according to controller (4), produces different electric machine phase current waveforms, driving electricity Machine (1) rotates.
- 2. impacting start system according to claim 1, it is characterised in that：The startup working condition of the motor is divided into normal activation state and locked rotor condition；When motor speed is less than rotating speed 1000rpm, determine that motor is in locked rotor condition；When motor speed reaches 1000rpm and the above, determine that motor is in normal activation state.
- 3. impacting start system according to claim 1 or 2, it is characterised in that：It is described produce segmentation pulse current waveform motor (1) rotate refer to current waveform constant in phase cycle being changed to it is more The pulse current waveform of individual segmentation.
- 4. impacting start system according to claim 1 or 2, it is characterised in that：The constant continuous current motor (1) of the upper limit rotates the phase electricity referred to using brushless electric machine is made in one cycle of the generation The constant pulse current of the stream upper limit carrys out the detent torque of controlled motor, so as to which controlled motor starts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721116686.6U CN207200603U (en) | 2017-09-01 | 2017-09-01 | Electric tool brshless DC motor impacting start system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721116686.6U CN207200603U (en) | 2017-09-01 | 2017-09-01 | Electric tool brshless DC motor impacting start system |
Publications (1)
| Publication Number | Publication Date |
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| CN207200603U true CN207200603U (en) | 2018-04-06 |
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ID=61790503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201721116686.6U Active CN207200603U (en) | 2017-09-01 | 2017-09-01 | Electric tool brshless DC motor impacting start system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565854A (en) * | 2017-09-01 | 2018-01-09 | 苏州亮明工具有限公司 | Electric tool brshless DC motor impacting start method and system |
-
2017
- 2017-09-01 CN CN201721116686.6U patent/CN207200603U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565854A (en) * | 2017-09-01 | 2018-01-09 | 苏州亮明工具有限公司 | Electric tool brshless DC motor impacting start method and system |
| CN107565854B (en) * | 2017-09-01 | 2024-01-30 | 苏州亮明工具有限公司 | Impact starting method and system for brushless direct current motor of electric tool |
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