CN203172715U - Variable-frequency electronic steering contactor - Google Patents
Variable-frequency electronic steering contactor Download PDFInfo
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- CN203172715U CN203172715U CN 201320201794 CN201320201794U CN203172715U CN 203172715 U CN203172715 U CN 203172715U CN 201320201794 CN201320201794 CN 201320201794 CN 201320201794 U CN201320201794 U CN 201320201794U CN 203172715 U CN203172715 U CN 203172715U
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Abstract
Aiming at the technical problem of loud noise during the high-speed rotating of a steering motor on an electronic platform truck or an electric tractor, the utility model provides a variable-frequency electronic steering contactor. The variable-frequency electronic steering contactor comprises a key switch, a PWM (pulse-width modulation) duty cycle input unit, an MCU (microprogammable control unit) and PWM generator, a PWM duty cycle setting unit, an MOS (metal oxide semiconductor) transistor, a current sampling unit, a steering request input unit, a power source management unit, an AD (analog/digital) sampling unit and an overcurrent protection unit. The variable-frequency electronic steering contactor has the advantage of being capable of effectively solving the problem of the loud noise of the steering motor and controlling the manufacturing cost.
Description
Background
The utility model belongs to the technical field of vehicle control, concretely relates to apply to variable frequency's on electric pallet truck or tractor electron steering contactor.
Background
The steering motor on current G series 2 ~ 5t exchange electric platform carrier and 8~25t electric tractor all is by a pump contactor control, and its theory of operation is: when the traction controller collects a foot brake switch signal or an accelerator pedal switch signal, a coil of the pump contactor is driven, and after the pump contactor is closed, the steering motor works in a full-pressure mode, so that the rotating speed of the steering motor reaches 1500 turns. Therefore, the steering system has high noise, which is mainly caused by the over-high rotating speed of the steering motor. In fact, if the steering performance is required to be met, the rotating speed of the steering motor can meet the requirement when reaching 700 turns, but the frequency conversion control of the steering motor is required, namely the rotating speed of the steering motor can be controlled according to the steering performance; however, pump controllers capable of performing variable frequency control of the steering motor in the market are basically monopolized by imported products. If the imported pump controller is adopted, the manufacturing cost of the vehicle is increased, and the market competitiveness of the product is weakened. If a substitute device which can adjust the duty ratio of the working voltage of the steering motor and has low price can be developed, the output voltage can meet the working requirement of the steering motor, and the manufacturing cost of the vehicle can be effectively controlled while the market requirement is effectively met.
SUMMERY OF THE UTILITY MODEL
The big technical problem of noise when turning to the high-speed rotation of motor on current electric platform carrier or the electric traction car, the utility model provides a variable frequency's electron turns to contactor, its concrete structure is:
the variable-frequency electronic steering contactor comprises a key switch 1, a PWM duty ratio input unit 2, an MCU and PWM generator 3, a PWM duty ratio setting unit 4, an MOS (metal oxide semiconductor) tube 5, a current sampling unit 6, a steering request input unit 7, a power supply management unit 8, an AD (analog-to-digital) sampling unit 9 and an overcurrent protection unit 10; wherein,
the signal output end of the key switch 1, the signal output end of the PWM duty ratio input unit 2 and the signal output end of the steering request input unit 7 are connected with the signal input ends of the MCU and the PWM generator 3 respectively;
the signal output end of the MCU and PWM generator 3 is connected with the signal input end of the PWM duty ratio setting unit 4, and the signal output end of the PWM duty ratio setting unit 4 is connected with the signal input end of the MOS tube 5;
the signal output end of the current sampling unit 6 is respectively connected with the signal input end of the AD sampling unit 9 and the signal input end of the overcurrent protection unit 10; wherein, the signal output end of the AD sampling unit 9 is connected with the signal input end of the MCU and the PWM generator 3; the signal output end of the overcurrent protection unit 10 is connected with the signal input end of the MOS transistor 5.
The power management unit 8 is connected to the MCU and the PWM generator 3.
Advantageous technical effects
This product can effectively solve the big problem of steering motor noise. By applying the product, the rotating speed of the steering motor can be controlled according to actual requirements, and when the rotating speed is reduced, the noise of a steering system is reduced;
the product can effectively control the manufacturing cost, and the cost of the product is only 1/3 of the price of imported products with the same functions.
Drawings
Fig. 1 is a block diagram of an electrical structure of the present product.
Detailed Description
The structural principle of the product will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the variable frequency electronic steering contactor is composed of a key switch 1, a PWM duty input unit 2, an MCU and PWM generator 3, a PWM duty setting unit 4, an MOS transistor 5, a current sampling unit 6, a steering request input unit 7, a power management unit 8, an AD sampling unit 9, and an overcurrent protection unit 10; wherein,
the signal output end of the key switch 1, the signal output end of the PWM duty ratio input unit 2 and the signal output end of the steering request input unit 7 are connected with the signal input ends of the MCU and the PWM generator 3 respectively;
the signal output end of the MCU and PWM generator 3 is connected with the signal input end of the PWM duty ratio setting unit 4, and the signal output end of the PWM duty ratio setting unit 4 is connected with the signal input end of the MOS tube 5;
the signal output end of the current sampling unit 6 is respectively connected with the signal input end of the AD sampling unit 9 and the signal input end of the overcurrent protection unit 10; wherein, the signal output end of the AD sampling unit 9 is connected with the signal input end of the MCU and the PWM generator 3; the signal output end of the overcurrent protection unit 10 is connected with the signal input end of the MOS transistor 5.
The power management unit 8 is connected to the MCU and the PWM generator 3.
The function of each functional unit is as follows:
the PWM duty ratio input unit 2 is an internal input port of the microcontroller, and the software realizes high-speed real-time judgment of the voltage value of the input port to adjust the PWM output pulse width;
the MCU and PWM generator 3 adopts an 8-bit microcontroller with the model of ATMEGA8, and can realize 256 different pulse width output states;
the PWM duty ratio setting unit 4 is a four-gear dial switch capable of manually setting and outputting 16 binary states, and changes the value of the PWM duty ratio in a manual setting mode;
the MOS tube 5 is used for providing voltage for the steering motor in real time, the MOS tube 5 is an MOS tube with the model number of FQA70N15, the current 210A is conducted, the withstand voltage is up to 150V, the internal resistance is 0.02 ohm, and the time for applying the voltage at two ends of the motor is adjusted by controlling the conduction and the cut-off of the MOS tube, so that the rotating speed of the motor is controlled;
the current sampling unit 6 is responsible for measuring the working current of the steering motor 11 in real time, and transmits one path of the detection result to the overcurrent protection unit 10 and transmits the other path of the detection result to the AD sampling unit 9;
the request input unit 7 controls the microcontroller to reset the voltage value of the port so as to enable the microcontroller to work normally;
the power management unit 8 uses a WD5-48S05 type switching power supply module with an error of 2 per mill, and has overvoltage, undervoltage and polarity protection;
the AD sampling unit 9 carries out digital conversion on the analog quantity provided by the current sampling unit 6 and then transmits the analog quantity to the MCU and the PWM generator 3; an internal AD sampling port of a microcontroller of the AD sampling unit 9 is used for realizing high-speed real-time sampling of a port voltage value by software, and the PWM output is closed when under-voltage and overvoltage exist through software calculation;
the overcurrent protection unit 10 is a MOS transistor G-pole driver with an output cut-off function, and the model number of the overcurrent protection unit is MC 33153; when the output current of the current sampling unit 6 is greater than 50A, the overcurrent protection unit 10 cuts off the output.
When the product is used, the key switch 1 is firstly turned on, so that the product is powered on and enters a self-checking initialization state, and then enters a working state after 0.5 second. The MCU and PWM unit 3 starts to operate the equipment after receiving the trigger signal of the steering request input unit 7. MCU and PWM unit 3 read PWM duty cycle coding value, for predetermineeing the rotational speed of rotating electrical machines 11, MCU and PWM unit 3 are through generating the PWM ripples of fixed frequency from taking PWM generator and then adjusting to dazzling ripples pulse width modulation, drive 5 chips of MOS pipe switch on or end, work voltage chop on the motor to realize rotating electrical machines 11's rotation. The MCU and PWM unit 3 samples the current of the rotating motor 11 in real time through the current sampling unit 6, one path of current is converted into a digital signal through the AD sampling unit 9 and fed back to the MCU and PWM unit 3 to adjust the PWM duty ratio; the other path of the voltage is sent to an overcurrent protection unit 10 to compare the voltage value. If the voltage exceeds the preset overcurrent voltage, the overcurrent protection circuit outputs a control signal to cut off the output of the MOS tube, and the rotation of the rotating motor 11 is stopped.
Claims (2)
1. The variable-frequency electronic steering contactor comprises a key switch (1) and is characterized by comprising a PWM duty ratio input unit (2), an MCU (microprogrammed control unit) and PWM (pulse-width modulation) generator (3), a PWM duty ratio setting unit (4), an MOS (metal oxide semiconductor) tube (5), a current sampling unit (6), a steering request input unit (7), a power supply management unit (8), an AD sampling unit (9) and an overcurrent protection unit (10); wherein,
the signal output end of the key switch (1), the signal output end of the PWM duty ratio input unit (2) and the signal output end of the steering request input unit (7) are connected with the signal input ends of the MCU and the PWM generator (3) respectively;
the signal output end of the MCU and the PWM generator (3) is connected with the signal input end of the PWM duty ratio setting unit (4), and the signal output end of the PWM duty ratio setting unit (4) is connected with the signal input end of the MOS tube (5);
the signal output end of the current sampling unit (6) is respectively connected with the signal input end of the AD sampling unit (9) and the signal input end of the overcurrent protection unit (10); wherein, the signal output end of the AD sampling unit (9) is connected with the signal input end of the MCU and the PWM generator (3); the signal output end of the overcurrent protection unit (10) is connected with the signal input end of the MOS tube (5);
the power management unit (8) is connected with the MCU and the PWM generator (3).
2. The variable frequency electronic steering contactor as claimed in claim 1,
the PWM duty ratio input unit (2) is an internal input port of the microcontroller, and the software realizes high-speed real-time judgment of the voltage value of the input port to adjust the PWM output pulse width;
the MCU and the PWM generator (3) adopt an 8-bit microcontroller with the model number of ATMEGA 8;
the PWM duty ratio setting unit (4) is a four-gear dial switch capable of manually setting and outputting 16 binary states;
the MOS tube (5) is an MOS tube with the model number of FQA70N15, the current is conducted 210A, the withstand voltage is up to 150V, the internal resistance is 0.02 ohm, and the time for applying the voltage at two ends of the motor is adjusted by controlling the conduction and the cut-off of the MOS tube, so that the rotating speed of the motor is controlled;
the power management unit (8) uses a WD5-48S05 type switching power supply module with an error of 2 per mill;
the overcurrent protection unit (10) is a MOS tube G pole driver with an output cutting-off function, and the model number of the overcurrent protection unit is MC 33153.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320201794 CN203172715U (en) | 2013-04-22 | 2013-04-22 | Variable-frequency electronic steering contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320201794 CN203172715U (en) | 2013-04-22 | 2013-04-22 | Variable-frequency electronic steering contactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203172715U true CN203172715U (en) | 2013-09-04 |
Family
ID=49069458
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320201794 Expired - Lifetime CN203172715U (en) | 2013-04-22 | 2013-04-22 | Variable-frequency electronic steering contactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203172715U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111483784A (en) * | 2019-01-28 | 2020-08-04 | 天下逻辑股份有限公司 | Safety type roller controller for logistics transmission system |
-
2013
- 2013-04-22 CN CN 201320201794 patent/CN203172715U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111483784A (en) * | 2019-01-28 | 2020-08-04 | 天下逻辑股份有限公司 | Safety type roller controller for logistics transmission system |
| CN111483784B (en) * | 2019-01-28 | 2021-11-19 | 天下逻辑股份有限公司 | Safety type roller controller for logistics transmission system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130904 |
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| CX01 | Expiry of patent term |