CN214380708U - Brake protection circuit for electric wheelchair with brushless DC motor in fault - Google Patents
Brake protection circuit for electric wheelchair with brushless DC motor in fault Download PDFInfo
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- CN214380708U CN214380708U CN202120405929.8U CN202120405929U CN214380708U CN 214380708 U CN214380708 U CN 214380708U CN 202120405929 U CN202120405929 U CN 202120405929U CN 214380708 U CN214380708 U CN 214380708U
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- 230000005611 electricity Effects 0.000 claims abstract description 5
- 230000006378 damage Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model provides a brake protection circuit when being used for direct current brushless motor electronic wheelchair trouble belongs to electronic wheelchair technical field, and it includes motor, switch, relay and motor driver, and the motor loops through switch and relay and is connected with the motor driver electricity. When faults such as power failure and electric system damage occur to the control system, the motor U and the motor V are in short circuit with the motor W, a large resistance is formed on the motor at the moment according to the Lenz law, the direction of the resistance is opposite to that of power generated by the original motor, the braking force for the motor is formed, the motor stops rotating, and the safety of personnel on the electric wheelchair is guaranteed.
Description
Technical Field
The utility model belongs to the technical field of electronic wheelchair, a brake technique of electronic wheelchair is related to, specifically is a brake protection circuit when being used for the electronic wheelchair trouble of DC brushless motor.
Background
The electronic wheelchair of brushless direct current motor who sells on the existing market, fault protection all adopts the electron brake to park, and the theory of operation of electron brake is: when the electric wheelchair is parked, the controller applies reverse voltage to the motor to achieve the purpose of braking, but when faults such as power failure and electric system damage occur to the control system, if the electric wheelchair is located at a position with a slope, the electric wheelchair is out of control due to loss of power, slides down the slope, has potential safety hazards, and causes personal injury to personnel on the wheelchair.
SUMMERY OF THE UTILITY MODEL
Can be out of control because of losing power when control system breaks down to above-mentioned current electronic wheelchair, the utility model provides a brake protection circuit for when direct current brushless motor electronic wheelchair trouble. The specific technical scheme is as follows:
a brake protection circuit for when direct current brushless motor electrically propelled wheelchair trouble, including motor, switch, relay and motor drive, the motor loops through switch and relay and is connected with the motor drive electricity.
Further limit, the motor has two, is first motor and second motor respectively, first motor and second motor all are connected with the switch.
Further, the V phase of the second motor is connected to pin 1 of the switch, the U phase of the second motor is connected to pin 2 of the switch, the U phase of the first motor is connected to pin 3 of the switch, and the V phase of the first motor is connected to pin 4 of the switch.
Further defined, the relay is a double pole double throw relay.
It is further defined that the double pole double throw relay includes a first relay and a second relay, both of which are connected to the switch.
Further, the pin 6 of the first relay is connected with the pin 5 of the switch, the pin 5 of the first relay is connected with the pin 6 of the switch, the pin 5 of the second relay is connected with the pin 7 of the switch, and the pin 6 of the second relay is connected with the pin 8 of the switch.
Further limiting, the number of the motor drivers is two, and the two motor drivers are respectively a first motor driver and a second motor driver, wherein the W phase of the first motor, the 3 pin of the first relay, the 4 pin of the first relay and the W phase of the first motor driver are sequentially connected in series from front to back, and the W phase of the second motor, the 3 pin of the second relay, the 4 pin of the second relay and the W phase of the second motor driver are sequentially connected in series from front to back; the U phase of the first motor driver is connected with the 7 pins of the first relay, the V phase of the first motor driver is connected with the 8 pins of the first relay, the U phase of the second motor driver is connected with the 7 pins of the second relay, and the V phase of the second motor driver is connected with the 8 pins of the second relay; the pin 2 of the first relay and the pin 2 of the second relay are connected with a control signal line of the first relay or the second relay, and the pin 1 of the first relay and the pin 1 of the second relay are connected with a control signal line of the second relay or the first relay.
Further, the motor is a brushless dc motor.
Further defined, the switch is a four-pole single-throw switch or a four-pole double-throw switch.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model is used for brake protection circuit when direct current brushless motor electrically-propelled wheelchair trouble, it includes motor, switch, relay and motor driver, and the motor loops through the switch and the relay is connected with the motor driver electricity. When the switch is in an on state, the motor U and the motor V are in a suspended state, the electric wheelchair is in a manual pushing mode, and the electric wheelchair can be manually pushed without resistance; when the switch is in a closed state, the motor driver energizes the relay to enable the 5 pin and the 7 pin on the relay to be conducted, and the 6 pin and the 8 pin on the relay to be conducted, namely, the U phase of the motor driver is conducted with the U phase of the motor, the V phase of the motor driver is conducted with the V phase of the motor, and the electric wheelchair is in a normal operation state; if the circumstances such as trouble, outage appear, the relay outage, 5 feet and 3 feet on the relay switch on, 6 feet and 4 feet switch on, make the U looks and the V looks short circuit of motor all with the W looks short circuit of motor, according to lenz's law, form great resistance on the motor this moment, this resistance is opposite with the power direction that original motor produced, has formed the brake force to the motor, and the motor stops the rotation, and electronic wheelchair loses power, has guaranteed personnel's on the electronic wheelchair safety. Simultaneously also make the utility model discloses a brake protection circuit can enough realize the brake function of electronic wheelchair, can realize the manual mode of carrying out after the electronic wheelchair trouble again.
Drawings
Fig. 1 is a schematic connection diagram of the brake protection circuit of the present invention;
FIG. 2 is a circuit diagram of a double pole double throw relay;
1-motor, 11-first motor, 12-second motor, 2-switch, 3-relay, 31-first relay, 32-second relay, 4-motor driver.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and examples, but the present invention is not limited to the embodiments explained below.
The utility model is used for brake protection circuit when direct current brushless motor electric wheelchair trouble, including motor 1, switch 2, relay 3 and motor drive 4, motor 1 loops through switch 2 and relay 3 and is connected with motor drive 4 electricity. The number of the motors 1 is two, namely a first motor 11 and a second motor 12, and the first motor 11 and the second motor 12 are both connected with the switch 2. The V phase of the second motor 12 is connected with the pin 1 of the switch 2, the U phase of the second motor 12 is connected with the pin 2 of the switch 2, the U phase of the first motor 11 is connected with the pin 3 of the switch 2, and the V phase of the first motor 11 is connected with the pin 4 of the switch 2. The relay 3 is a double-pole double-throw relay. The double pole double throw relay includes a first relay 31 and a second relay 32, and the first relay 31 and the second relay 32 are connected to the switch 2. Pin 6 of the first relay 31 is connected with pin 5 of the switch 2, pin 5 of the first relay 31 is connected with pin 6 of the switch 2, pin 5 of the second relay 32 is connected with pin 7 of the switch 2, and pin 6 of the second relay 32 is connected with pin 8 of the switch 2. The two motor drivers 4 are respectively a first motor driver and a second motor driver, the W phase of the first motor 11, the 3 pin of the first relay 31, the 4 pin of the first relay 31 and the W phase of the first motor driver are sequentially connected in series from front to back, and the W phase of the second motor 12, the 3 pin of the second relay 32, the 4 pin of the second relay 32 and the W phase of the second motor driver are sequentially connected in series from front to back; the U phase of the first motor driver is connected with the pin 7 of the first relay 31, the V phase of the first motor driver is connected with the pin 8 of the first relay 31, the U phase of the second motor driver is connected with the pin 7 of the second relay 32, and the V phase of the second motor driver is connected with the pin 8 of the second relay 32; the pin 2 of the first relay 31 and the pin 2 of the second relay 32 are both connected with a control signal line of the first relay 31 or the second relay 32, and the pin 1 of the first relay 31 and the pin 1 of the second relay 32 are both connected with a control signal line of the second relay 32 or the first relay 31. The motor 1 is a dc brushless motor. The switch 2 is a four-pole single-throw switch or a four-pole double-throw switch.
Example 1
Referring to fig. 1, the brake protection circuit for the dc brushless motor electric wheelchair in the fault of the present embodiment includes a motor 1, a switch 2, a relay 3 and a motor driver 4, where the switch 2 is a four-pole double-throw switch, the motor 1 is a dc brushless motor, two pins of the switch 2 are respectively connected to two phases of the motor 1, the other two pins of the switch 2 are respectively connected to two pins of the relay 3, and the other two pins of the relay 3 are respectively connected to two phases of the motor driver 4.
Example 2
Referring to fig. 2, the brake protection circuit for the dc brushless motor electric wheelchair in failure of the present embodiment includes a motor 1, a switch 2, a relay 3 and a motor driver 4, the switch 2 is a four-pole single-throw switch, the four-pole single-throw switch is of a type E-TEN12210, the motor 1 is a dc brushless motor, there are two motors 1, which are a first motor 11 and a second motor 12, respectively, the relay 3 is a double-pole double-throw relay, the double-pole double-throw relay is of a type JQX-115F-024-2ZS4, the double-pole double-throw relay includes a first relay 31 and a second relay 32, the motor drivers 4 are two, which are a first motor driver and a second motor driver, respectively, a V phase of the second motor 12 is connected to a pin 1 of the switch 2, a U phase of the second motor 12 is connected to a pin 2 of the switch 2, a U phase of the first motor 11 is connected to a pin 3 of the switch 2, the V phase of the first motor 11 is connected with the 4 pins of the switch 2; a pin 6 of the first relay 31 is connected with a pin 5 of the switch 2, a pin 5 of the first relay 31 is connected with a pin 6 of the switch 2, a pin 5 of the second relay 32 is connected with a pin 7 of the switch 2, and a pin 6 of the second relay 32 is connected with a pin 8 of the switch 2; the W phase of the first motor 11, the pin 3 of the first relay 31, the pin 4 of the first relay 31 and the W phase of the first motor driver are sequentially connected in series from front to back, and the W phase of the second motor 12, the pin 3 of the second relay 32, the pin 4 of the second relay 32 and the W phase of the second motor driver are sequentially connected in series from front to back; the U phase of the first motor driver is connected with the pin 7 of the first relay 31, the V phase of the first motor driver is connected with the pin 8 of the first relay 31, the U phase of the second motor driver is connected with the pin 7 of the second relay 32, and the V phase of the second motor driver is connected with the pin 8 of the second relay 32; the pin 2 of the first relay 31 and the pin 2 of the second relay 32 are both connected with a control signal line of the first relay 31 or the second relay 32, and the pin 1 of the first relay 31 and the pin 1 of the second relay 32 are both connected with a control signal line of the second relay 32 or the first relay 31.
When the brake protection circuit for the direct-current brushless motor electric wheelchair is in work, when the switch 2 is in an open state, the U of the motor 1 and the V of the motor 1 are in a suspended state, the electric wheelchair is in a manual pushing mode, and the electric wheelchair can be manually pushed without resistance; when the switch 2 is in a closed state, the first motor driver and the second motor driver respectively electrify the first relay 31 and the second relay 32, so that the 5 pins and the 7 pins on the first relay 31 and the second relay 32 are conducted, and the 6 pins and the 8 pins are conducted, that is, the U phase of the first motor 11 is conducted with the U phase of the first motor driver, the V phase of the first motor 11 is conducted with the V phase of the first motor driver, the U phase of the second motor 12 is conducted with the U phase of the second motor driver, the V phase of the second motor 12 is conducted with the V phase of the second motor driver, and the electric wheelchair is in a normal operation state; if the conditions such as fault and power failure occur, the relays are powered off, the 5 pins and the 3 pins on the first relay 31 and the second relay 32 are conducted, the 6 pins and the 4 pins are conducted, the U phase and the V phase of the first motor 11 are all in short circuit with the W phase of the first motor 11, the U phase and the V phase of the second motor 12 are all in short circuit with the W phase of the second motor 12, according to the Lenz law, the larger resistance is formed on the first motor 11 and the second motor 12 at the moment, the resistance is opposite to the power direction generated by the original first motor 11 and the original second motor 12, the braking force for the first motor 11 and the second motor 12 is formed, the first motor 11 and the second motor 12 stop rotating, the power of the electric wheelchair is lost, and the safety of personnel on the electric wheelchair is guaranteed. Simultaneously also make the utility model discloses a brake protection circuit can enough realize the brake function of electronic wheelchair, can realize the manual mode of carrying out after the electronic wheelchair trouble again.
Claims (9)
1. A brake protection circuit for when direct current brushless motor electronic wheelchair trouble, its characterized in that, including motor (1), switch (2), relay (3) and motor drive (4), motor (1) loops through switch (2) and relay (3) and is connected with motor drive (4) electricity.
2. The brake protection circuit for the brushless DC motor electric wheelchair in failure according to claim 1, wherein there are two motors (1), a first motor (11) and a second motor (12), and the first motor (11) and the second motor (12) are both connected to the switch (2).
3. The brake protection circuit for the brushless DC motor electric wheelchair in failure as claimed in claim 2, wherein the V phase of the second motor (12) is connected with the 1 pin of the switch (2), the U phase of the second motor (12) is connected with the 2 pin of the switch (2), the U phase of the first motor (11) is connected with the 3 pin of the switch (2), and the V phase of the first motor (11) is connected with the 4 pin of the switch (2).
4. The brake protection circuit for the DC brushless motor electric wheelchair in failure according to claim 3, characterized in that the relay (3) is a double-pole double-throw relay.
5. The brake protection circuit for the brushless DC motor electric wheelchair in the event of a fault according to claim 4, characterized in that the double pole double throw relay comprises a first relay (31) and a second relay (32), the first relay (31) and the second relay (32) being connected to the switch (2).
6. The brake protection circuit for the DC brushless motor electric wheelchair in failure according to claim 5, characterized in that the first relay (31) has 6 pins connected with 5 pins of the switch (2), the first relay (31) has 5 pins connected with 6 pins of the switch (2), the second relay (32) has 5 pins connected with 7 pins of the switch (2), and the second relay (32) has 6 pins connected with 8 pins of the switch (2).
7. The brake protection circuit for the DC brushless motor electric wheelchair in failure according to claim 6, wherein the motor drivers (4) are two, namely a first motor driver and a second motor driver, the W phase of the first motor (11), the 3 pin of the first relay (31), the 4 pin of the first relay (31) and the W phase of the first motor driver are sequentially connected in series from front to back, and the W phase of the second motor (12), the 3 pin of the second relay (32), the 4 pin of the second relay (32) and the W phase of the second motor driver are sequentially connected in series from front to back; the U phase of the first motor driver is connected with the pin 7 of a first relay (31), the V phase of the first motor driver is connected with the pin 8 of the first relay (31), the U phase of the second motor driver is connected with the pin 7 of a second relay (32), and the V phase of the second motor driver is connected with the pin 8 of the second relay (32); the pin 2 of the first relay (31) and the pin 2 of the second relay (32) are connected with a control signal line of the first relay (31) or the second relay (32), and the pin 1 of the first relay (31) and the pin 1 of the second relay (32) are connected with a control signal line of the second relay (32) or the first relay (31).
8. The brake protection circuit for the DC brushless motor electric wheelchair in failure according to claim 7, characterized in that the motor (1) is a DC brushless motor.
9. The brake protection circuit for the DC brushless motor electric wheelchair in failure according to claim 8, wherein the switch (2) is a four-pole single-throw switch or a four-pole double-throw switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120405929.8U CN214380708U (en) | 2021-02-24 | 2021-02-24 | Brake protection circuit for electric wheelchair with brushless DC motor in fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120405929.8U CN214380708U (en) | 2021-02-24 | 2021-02-24 | Brake protection circuit for electric wheelchair with brushless DC motor in fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214380708U true CN214380708U (en) | 2021-10-08 |
Family
ID=77967135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120405929.8U Expired - Fee Related CN214380708U (en) | 2021-02-24 | 2021-02-24 | Brake protection circuit for electric wheelchair with brushless DC motor in fault |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214380708U (en) |
-
2021
- 2021-02-24 CN CN202120405929.8U patent/CN214380708U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211008 |