CN205489473U - Three -phase brushless motor's temperature protection circuit - Google Patents
Three -phase brushless motor's temperature protection circuit Download PDFInfo
- Publication number
- CN205489473U CN205489473U CN201620227383.0U CN201620227383U CN205489473U CN 205489473 U CN205489473 U CN 205489473U CN 201620227383 U CN201620227383 U CN 201620227383U CN 205489473 U CN205489473 U CN 205489473U
- Authority
- CN
- China
- Prior art keywords
- relay
- motor
- resistance
- phase brushless
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model relates to a circuit protection technical field discloses three -phase brushless motor's temperature protection circuit, including relay (1) and with first resistance (2) that relay (1) is connected, still include at least one hot protector (3) of being connected with relay (1) one end, first resistance (2) are connected with hot protector (3), are equipped with relay contact points (11) on relay (1), are equipped with on relay contact points (11) and thermistor (4) that connected in parallel relay contact points (11). The utility model discloses install more portably, the cost is lower, leads to the overheat protection ware and is connected with stator winding, has improved the accuracy of the hot protector detection motor intensification condition, during the motor high temperature, restricts the power supply electric current of motor through thermistor to cut off the supply of electric energy, the to avoid electrical temperature continues to rise.
Description
Technical field
This utility model relates to circuit protection technical field, and the temperature particularly relating to a kind of three-phase brushless motor is protected
Protection circuit.
Background technology
Only having one group of coil electricity different when working from brush motor, brushless electric machine is by non-carbonate electronics side
Formula carries out commutation, and motor operationally electric current is regular alternately through three groups of coils according to commutation algorithm.?
Under the normal duty of motor, electric current is limited in rated range, and motor coil generates heat in controlled range
In, motor will not be caused damage.But occur under the fortuitous events such as overload, phase shortage and stall at motor,
Electric current in motor coil may steeply rise, and causes motor coil temperature too high.If motor continues fortune
OK, the insulating barrier of motor coil is easy to puncture and cause motor damage.
Temperature protection circuit for brushless electric machine is of a great variety the most on the market, and major defect includes:
1. the structure of device design is the most complicated, and use cost is the highest；
2. temperature detection is inaccurate, it is impossible to the most correct protects brushless electric machine according to design temperature.May
Occur that temperature does not produces protection yet higher than secure threshold or temperature does not reaches secure threshold and mistake occurs the feelings of protection
Condition, the previous case can cause the damage of motor, and latter event can affect the properly functioning of motor.
3. using software-controlled manner, safety (such as UL, CE etc.) the authentication test cycle is long, and certification is costly.
Summary of the invention
This utility model is for shortcoming in prior art, it is provided that a kind of circuit structure is simple, the three of low cost
The temperature protection circuit of phase brushless electric machine.
In order to solve above-mentioned technical problem, this utility model is addressed by following technical proposals:
The temperature protection circuit of three-phase brushless motor, including relay and the first resistance of being connected with relay,
Also including at least one thermal protector being connected with relay one end, the first resistance is connected with thermal protector, continues
Electrical equipment is provided with relay contact, and relay contact is provided with the critesistor in parallel with relay contact.Heat
Protector is common AC thermal protector, instead of high-power, high voltage by common AC thermal protector
With the thermal protector of large volume, installing easier, cost is lower, and thermal protector connects circuit breaker, electricity
When machine temperature is too high, thermal protector is made to disconnect with circuit breaker, by the supply current of critesistor limiting motor,
Thus cutting off the supply of electric energy, it is to avoid motor temperature continues to raise.
As preferably, the quantity of thermal protector is two, thermal protector be connected on relay and the first resistance it
Between.By series connection thermal protector, improve the reliability of detection motor temperature.
As preferably, relay is additionally provided with diode all in parallel with relay and RC circuit, RC circuit
Including the second resistance and with the electric capacity of the second resistant series.
As preferably, also include the motor being connected with relay contact, be provided with between relay contact and motor
The storage capacitor connected with relay contact.
As preferably, being provided with stator winding in motor, thermal protector is connected with stator winding.Thermal protector with
Stator winding contact connects, and facilitates thermal protector to detect the temperature conditions of motor stator winding accurately.
As preferably, the other end of relay is provided with the power supply being connected with relay, and the voltage of power supply is
10～20V.
This utility model, owing to have employed above technical scheme, has significant technique effect: install easier,
Cost is lower, when motor temperature is too high, thermal protector connects and has circuit breaker, when motor temperature is too high, make
Thermal protector disconnects with circuit breaker, by the supply current of critesistor limiting motor, thus cuts off electric energy
Supply, it is to avoid motor temperature continues to raise, and is connected with stator winding by thermal protector, improves Thermal protection
The accuracy of device detection motor ramp case.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
The toponym that in accompanying drawing, each number designation is referred to is as follows: 1 relay, 2 first resistance, 3
Thermal protector, 4 critesistor, 5 diodes, 6 RC circuit, 7 second resistance, 8 electric capacity, 9
Motor, 10 storage capacitors, 11 relay contacts.
Detailed description of the invention
With embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
The temperature protection circuit of three-phase brushless motor, including relay 1 and be connected with relay 1 first electricity
Resistance 2, also includes at least one thermal protector 3 being connected with relay 1 one end, is connected with thermal protector 3
One end of relay 1 is the drive end of relay 1, and the first resistance 2 is connected with thermal protector 3, relay 1
Being provided with relay contact 11, relay contact 11 is provided with the critesistor 4 in parallel with relay contact 11,
The quantity of thermal protector 3 is two, and thermal protector 3 is connected between relay 1 and the first resistance 2, the
One end of one resistance 2 is connected with thermal protector 3, and the other end of the first resistance 2 is connected with one end of transistor,
The other end of transistor is electrically connected to ground, and the R3 of leading up to of transistor controls end is electrically connected to the IO of MCU
Mouthful, control end resistance R2 of separately leading up to be electrically connected to ground, relay 1 is additionally provided with all with relay 1
Diode 5 and RC circuit 6 in parallel, RC circuit 6 includes the second resistance 7 and connects with the second resistance 7
Electric capacity 8, also include the motor 9 being connected with relay contact 11, between relay contact 11 and motor 9
It is provided with the storage capacitor 10 connected with relay contact 11, in motor 9, is provided with stator winding, thermal protector 3
Being connected with stator winding, the other end of relay 1 is provided with the power supply being connected with relay 1, the voltage of power supply
For 15V,
Under motor 9 reference performance, thermal protector 3 does not works, and keeps electrically connecting, relay 1
Drive end electrically connects 15V power supply, and relay contact 11 holding circuit is connected, and critesistor 4 is bypassed, directly
Stream busbar voltage normally exports on storage capacitor 10, and power supply machine 9 normally works.
In the case of excess temperature occurs in motor 9 work, thermal protector 3 detects motor 9 inner stator winding temperature
Raising, thermal protector 3 disconnects, and the drive end no current of relay 1 passes through, and relay contact 11 disconnects also
Limiting power supply, critesistor 4 can not be bypassed by relay contact 11, and the operating current of motor 9 is through temperature-sensitive
Resistance 4, now critesistor 4 is brought rapidly up, and resistance increases rapidly, limits the supply current on bus,
Thus having cut off the electric energy supply to motor 9, it is to avoid motor 9 works on and causes temperature to raise.
In a word, the foregoing is only preferred embodiment of the present utility model, all apply for a patent according to this utility model
Equalization change and the modification that scope is made, all should belong to the covering scope of this utility model patent.
Claims (6)
1. the temperature protection circuit of three-phase brushless motor, including relay (1) and be connected with relay (1)
One resistance (2), it is characterised in that: also include at least one thermal protector being connected with relay (1) one end
(3), the first resistance (2) is connected with thermal protector (3), and relay (1) is provided with relay contact (11),
Relay contact (11) is provided with the critesistor (4) in parallel with relay contact (11).
The temperature protection circuit of three-phase brushless motor the most according to claim 1, it is characterised in that: Thermal protection
The quantity of device (3) is two, thermal protector (3) be connected on relay (1) and the first resistance (2) it
Between.
The temperature protection circuit of three-phase brushless motor the most according to claim 1, it is characterised in that: relay
(1) diode (5) all in parallel with relay (1) and RC circuit (6), RC circuit (6) it are additionally provided with on
Including the second resistance (7) and the electric capacity (8) connected with the second resistance (7).
The temperature protection circuit of three-phase brushless motor the most according to claim 1, it is characterised in that: also include
The motor (9) being connected with relay contact (11), is provided with between relay contact (11) and motor (9)
The storage capacitor (10) connected with relay contact (11).
The temperature protection circuit of three-phase brushless motor the most according to claim 4, it is characterised in that: motor (9)
Inside being provided with stator winding, thermal protector (3) is connected with stator winding.
The temperature protection circuit of three-phase brushless motor the most according to claim 1, it is characterised in that: relay
(1) the other end is provided with the power supply being connected with relay (1), and the voltage of power supply is 10～20V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620227383.0U CN205489473U (en) | 2016-03-23 | 2016-03-23 | Three -phase brushless motor's temperature protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620227383.0U CN205489473U (en) | 2016-03-23 | 2016-03-23 | Three -phase brushless motor's temperature protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205489473U true CN205489473U (en) | 2016-08-17 |
Family
ID=56651348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620227383.0U Active CN205489473U (en) | 2016-03-23 | 2016-03-23 | Three -phase brushless motor's temperature protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205489473U (en) |
-
2016
- 2016-03-23 CN CN201620227383.0U patent/CN205489473U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107107774A (en) | Motor vehicle charging socket with overtemperature protection | |
| CN204231188U (en) | Power conversion circuit and transducer air conditioning | |
| CN201378732Y (en) | Inrush current protecting circuit and motor employing same | |
| CN104716860B (en) | Converter device and operation method for uniaxial or multiaxis arrangement | |
| CN104767176B (en) | The monocycle detection and guard method of a kind of brshless DC motor peak point current | |
| CN101867336A (en) | Driving controller of electric eddy current brake and control method thereof | |
| CN205489473U (en) | Three -phase brushless motor's temperature protection circuit | |
| US9270108B2 (en) | Protection circuit for brushed DC motor | |
| CN102158149B (en) | A kind of electronic circuit for starting of motor of minitype refrigeration compressor | |
| US9419548B2 (en) | Method and control circuit for controlling a brushless electric motor | |
| CN115940081A (en) | Overvoltage protection device based on combination of multi-characteristic nonlinear resistance cards | |
| CN201733073U (en) | Motor protector realizing protection by positive temperature factor thermistance | |
| CN109842327A (en) | Electric tool | |
| CN201562951U (en) | Fault arc protection device | |
| CN104600677A (en) | Short-circuit protection method for transistor in control circuit | |
| CN210270579U (en) | Novel heating wire protection circuit | |
| CN202696110U (en) | Overvoltage and under-voltage protection circuit | |
| CN102201767A (en) | Motor device and fan using same | |
| CN203690893U (en) | Series motor with double protection, and stator assembly thereof | |
| CN202488110U (en) | Over-current protective device | |
| CN210927368U (en) | Double-voltage thermal protection motor | |
| CN110417193A (en) | A kind of generator with overcurrent and overheating protection | |
| CN218499033U (en) | Motor drive circuit and control system | |
| CN103296642A (en) | Short circuit protective circuit of direct current motor driver load | |
| CN211480908U (en) | Voltage regulator and alternating-current generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |