CN205193240U - Brushless DC motor testing arrangement - Google Patents

Abstract

The utility model discloses a brushless DC motor testing arrangement, brushless DC motor testing arrangement constitutes as follows: motor drive subassembly, system protection subassembly and test data display module, the motor drive subassembly includes: D. C. Regulated power supply, filter circuit, three -phase switch device, steering control unit and hall decoding circuit, the system protection subassembly includes voltage current detection unit, promptly stops protected location, current control unit and PWM modulated circuit, the test data display module includes voltage display element, electric current display element and rotational speed display element, brushless DC motor testing arrangement have motor rotation controllable, promptly stop, function such as current -limiting protection, overload protection and short -circuit protection to performance parameter such as measurable quantity and demonstration motor power supply voltage, power supply electric current and motor rotation number. Satisfy the motor and develop in -process, the experimental and measurement requirement of each link.

Description

A brushless DC motor testing device

technical field

The utility model relates to the technical field of structural design and application of a testing device, in particular providing a testing device for a brushless DC motor.

Background technique

During the production process of brushless DC motors, processes such as circuit board debugging, testing and acceptance, performance testing, and environmental testing are required. Circuit board debugging is a part of motor production. The performance of the motor is highly discrete, and overcurrent and short circuit phenomena often occur. The test acceptance is the acceptance of the routine project of the motor. Generally, it is necessary to measure the relevant parameters of the motor under clockwise and counterclockwise rotation. The equipment needs to be able to control The motor turns, and measures and displays performance parameters such as the motor supply voltage, supply current and motor speed. Performance test and environmental test belong to the performance assessment of the motor in a harsh working environment. Mechanical failures and severe overloads may occur. Emergency stop and overload protection measures should be taken according to the site conditions. After the test, the related performance of the motor needs to be verified. Measure parameters such as motor supply voltage, supply current and motor speed. Therefore, multiple sets of power supplies, test instruments and related control and protection equipment are required.

People are eager to obtain a brushless DC motor testing device with excellent technical effect.

Utility model content

The purpose of the utility model is to provide a brushless DC motor testing device with excellent technical effect.

The brushless DC motor testing device is constituted as follows: a motor drive assembly, a system protection assembly, and a test data display assembly; the motor drive assembly includes: a DC stabilized voltage power supply 11, a filter circuit 12, a three-phase switching device 13, and a steering control unit 14 and Hall decoding circuit 15; the system protection components include a voltage and current detection unit 21, an emergency stop protection unit 22, a current control unit 23 and a PWM modulation circuit 24; the operator can stop the test system immediately if necessary according to the on-site usage conditions, A manual emergency stop command 26 can be issued to close the test system to realize the emergency stop function. The test data display assembly includes a voltage display unit 31, a current display unit 32 and a rotational speed display unit 33; the three-phase switching device 13 is connected to the DC stabilized power supply 11 through the voltage and current detection unit 21, the emergency stop protection unit 22 and the filter circuit 12 in sequence, The voltage and current detection unit 21 detects the voltage value and the current value through the voltage sensor and the current sensor, the voltage and current detection unit 21 sends the voltage signal to the voltage display unit 31, and the voltage and current detection unit 21 sends the current signal to the emergency stop protection unit 22, the current The control unit 23, the current display unit 32, the voltage display unit 31 and the current display unit 32 convert the digital signal into a 5-digit decimal signal, and display it through a digital tube, which is convenient for the operator to read. If the test device is overloaded or short-circuited, a large overload current or short-circuit current will be generated, which will damage the test device. The voltage and current detection unit 21 compares the measured current value with the preset current upper limit. If the current upper limit that the device can withstand is exceeded, the emergency stop protection unit 22 automatically cuts off the system power supply to protect subsequent functional units from overload and damage. Short-circuit current destruction, to achieve overload protection and short-circuit protection. The current control unit 23 is connected to the three-phase switching device 13 through the PWM modulation circuit 24 , and the current limiting protection function is realized through the current control unit 23 and the PWM modulation circuit 24 . The current control unit 23 compares the current detection signal with the current control signal 25 , and if the system current detection signal exceeds the requirement of the current control signal 25 , the current control unit sends an instruction to reduce the current to the PWM modulation circuit 24 . The PWM modulation circuit 24 reduces the duty cycle of the PWM waveform, reduces the conduction time of the three-phase switching device 13 , and further reduces the system current, realizing the function of limiting the current protection system. The three-phase switching device 13 is connected with the brushless DC motor 4, the Hall decoding circuit 15 is connected with the three-phase switching device 13 and the Hall sensor 5 in the brushless DC motor 4, and the Hall sensor 5 is connected with the speed display unit 33, The Hall sensor 5 sends the Hall position signal to the speed display unit 33, and the speed display unit 33 first measures the frequency value of the position signal, converts the frequency value into a speed value by formula 1, and displays it through the digital tube. Realize the measurement of motor power supply voltage, power supply current and motor speed and other performance parameters, and perform digital display for easy reading and recording.

$\mathrm{no}=\frac{60f}{p}$ (Formula 1)

Among them: n——motor speed, unit rpm;

f——position signal frequency, unit Hz;

p——the number of motor pole pairs, determined by the motor under test.

The DC stabilized power supply 11 and the steering control unit 14 are connected to the Hall decoding circuit 15; when the brushless DC motor is tested, the rotor rotation position is converted into a level signal through the Hall sensor 5, and the Hall decoding circuit 15 combines the steering control The signal 16 and the position level signal output the on-off signal of the three-phase switching device 13 according to the winding conduction logic relationship shown in Table 1, and drive and control the three-phase switching device 13 to turn on or off, so as to realize the function of driving the motor and controlling the steering. Features.

Described filter circuit 12 is constituted as follows: inductance 121, first electric capacity 122 and second electric capacity 123; First electric capacity 122 and second electric capacity 123 are connected in parallel with inductance 121 in series; Described inductance 121 adopts the round copper enameled wire winding of φ 2 and forms The number of winding turns is 10-20 turns; the first capacitor 122 is a high-frequency ceramic capacitor with a capacitance of 0.1uF; the second capacitor 123 is an electrolytic capacitor with a capacitance of 3300uF.

The maximum voltage of the test data of the universal brushless motor testing equipment is 200V, the precision is 0.5%; the maximum current is 50A, the precision is 0.5%; the speed is 30-100000rpm, the precision is 1%. The number of pole pairs of the testable motor can be one of 1, 2, 4, 6, 8, 10, 12, and 14; the power is 10-1500W. The upper limit of the emergency stop current is 35A, and the emergency stop of the motor can be completed within 0.1s. The current control signal can be any value within 0-30A, and the control accuracy can reach 2%.

Table 1

turn to Hall A Hall B Hall C Winding A Winding B Winding C Shun 1 0 0 h - L Shun 1 1 0 - h L Shun 0 1 0 L h - Shun 0 1 1 L - h Shun 0 0 1 - L h Shun 1 0 1 h L - inverse 1 0 0 L - h inverse 1 1 0 - L h inverse 0 1 0 h L - inverse 0 1 1 h - L inverse 0 0 1 - h L inverse 1 0 1 L h -

Brushless DC motors have many advantages such as small size, high speed, high efficiency, and easy control, and are widely used in aerospace, rail transit, electric locomotives, precision machine tools and other fields. When the brushless DC motor is working, the Hall sensor is required to convert the rotor rotation position into a level signal, and the Hall decoding circuit converts the position level signal into the on-off signal of the three-phase switching device, and drives the three-phase switching device to conduct Or disconnect to realize the function of driving the motor. Brushless DC motors need to be tested for motor performance during production, acceptance, and testing. The brushless DC motor testing device greatly reduces the related equipment required for motor debugging, testing, acceptance and testing, simplifies the operation process, and improves production efficiency.

The brushless DC motor test device described in the utility model has the functions of controllable motor steering, emergency stop, current limiting protection, overload protection and short circuit protection, and can measure and display performance parameters such as motor power supply voltage, power supply current and motor speed . Meet the test and measurement requirements of each link in the motor development and production process.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

Figure 1 is a schematic diagram of the principle of the brushless DC motor test device;

Figure 2 is a schematic diagram of the filter circuit.

detailed description

Example 1

The brushless DC motor testing device is constituted as follows: a motor drive assembly, a system protection assembly, and a test data display assembly; the motor drive assembly includes: a DC stabilized voltage power supply 11, a filter circuit 12, a three-phase switching device 13, and a steering control unit 14 and Hall decoding circuit 15; the system protection components include a voltage and current detection unit 21, an emergency stop protection unit 22, a current control unit 23 and a PWM modulation circuit 24; the operator can stop the test system immediately if necessary according to the on-site usage conditions, A manual emergency stop command 26 can be issued to close the test system to realize the emergency stop function. The test data display assembly includes a voltage display unit 31, a current display unit 32 and a rotational speed display unit 33; the three-phase switching device 13 is connected to the DC stabilized power supply 11 through the voltage and current detection unit 21, the emergency stop protection unit 22 and the filter circuit 12 in sequence, The voltage and current detection unit 21 detects the voltage value and the current value through the voltage sensor and the current sensor, the voltage and current detection unit 21 sends the voltage signal to the voltage display unit 31, and the voltage and current detection unit 21 sends the current signal to the emergency stop protection unit 22, the current The control unit 23, the current display unit 32, the voltage display unit 31 and the current display unit 32 convert the digital signal into a 5-digit decimal signal, and display it through a digital tube, which is convenient for the operator to read. If the test device is overloaded or short-circuited, a large overload current or short-circuit current will be generated, which will damage the test device. The voltage and current detection unit 21 compares the measured current value with the preset current upper limit. If the current upper limit that the device can withstand is exceeded, the emergency stop protection unit 22 automatically cuts off the system power supply to protect subsequent functional units from overload and damage. Short-circuit current destruction, to achieve overload protection and short-circuit protection. The current control unit 23 is connected to the three-phase switching device 13 through the PWM modulation circuit 24 , and the current limiting protection function is realized through the current control unit 23 and the PWM modulation circuit 24 . The current control unit 23 compares the current detection signal with the current control signal 25 , and if the system current detection signal exceeds the requirement of the current control signal 25 , the current control unit sends an instruction to reduce the current to the PWM modulation circuit 24 . The PWM modulation circuit 24 reduces the duty cycle of the PWM waveform, reduces the conduction time of the three-phase switching device 13 , and further reduces the system current, realizing the function of limiting the current protection system. The three-phase switching device 13 is connected with the brushless DC motor 4, the Hall decoding circuit 15 is connected with the three-phase switching device 13 and the Hall sensor 5 in the brushless DC motor 4, and the Hall sensor 5 is connected with the speed display unit 33, The Hall sensor 5 sends the Hall position signal to the speed display unit 33, and the speed display unit 33 first measures the frequency value of the position signal, converts the frequency value into a speed value by formula 1, and displays it through the digital tube. Realize the measurement of motor power supply voltage, power supply current and motor speed and other performance parameters, and perform digital display for easy reading and recording.

$\mathrm{no}=\frac{60f}{p}$ (Formula 1)

Among them: n—motor speed, unit rpm; f—position signal frequency, unit Hz; p—motor pole pair number, determined by the motor under test.

The DC stabilized power supply 11 and the steering control unit 14 are connected to the Hall decoding circuit 15; when the brushless DC motor is tested, the rotor rotation position is converted into a level signal through the Hall sensor 5, and the Hall decoding circuit 15 combines the steering control The signal 16 and the position level signal output the on-off signal of the three-phase switching device 13 according to the winding conduction logic relationship shown in Table 1, and drive and control the three-phase switching device 13 to turn on or off, so as to realize the function of driving the motor and controlling the steering. Features.

Described filter circuit 12 is constituted as follows: inductance 121, first electric capacity 122 and second electric capacity 123; First electric capacity 122 and second electric capacity 123 are connected in parallel with inductance 121 in series; Described inductance 121 adopts the round copper enameled wire winding of φ 2 and forms The number of winding turns is 10-20 turns; the first capacitor 122 is a high-frequency ceramic capacitor with a capacitance of 0.1uF; the second capacitor 123 is an electrolytic capacitor with a capacitance of 3300uF.

Table 1

The maximum voltage of the test data of the universal brushless motor testing equipment is 200V, the precision is 0.5%; the maximum current is 50A, the precision is 0.5%; the speed is 30-100000rpm, the precision is 1%. The number of pole pairs of the testable motor can be one of 1, 2, 4, 6, 8, 10, 12, and 14; the power is 10-1500W. The upper limit of the emergency stop current is 35A, and the emergency stop of the motor can be completed within 0.1s. The current control signal can be any value within 0-30A, and the control accuracy can reach 2%.

Brushless DC motors have many advantages such as small size, high speed, high efficiency, and easy control, and are widely used in aerospace, rail transit, electric locomotives, precision machine tools and other fields. When the brushless DC motor is working, the Hall sensor is required to convert the rotor rotation position into a level signal, and the Hall decoding circuit converts the position level signal into the on-off signal of the three-phase switching device, and drives the three-phase switching device to conduct Or disconnect to realize the function of driving the motor. Brushless DC motors need to be tested for motor performance during production, acceptance, and testing. The brushless DC motor testing device greatly reduces the related equipment required for motor debugging, testing, acceptance and testing, simplifies the operation process, and improves production efficiency.

The brushless DC motor test device has the functions of controllable motor steering, emergency stop, current limiting protection, overload protection and short circuit protection, and can measure and display performance parameters such as motor supply voltage, supply current and motor speed. Meet the test and measurement requirements of each link in the motor development and production process.

Claims (2)

1. A brushless DC motor testing device, characterized in that: the brushless DC motor testing device consists of the following: a motor drive assembly, a system protection assembly and a test data display assembly; the motor drive assembly includes: a DC stabilized power supply (11), filter circuit (12), three-phase switching device (13), steering control unit (14) and Hall decoding circuit (15); system protection components include voltage and current detection unit (21), emergency stop protection unit (22), current control unit (23) and PWM modulation circuit (24); The test data display assembly includes voltage display unit (31), current display unit (32) and speed display unit (33); three-phase switching device (13 ) through the voltage and current detection unit (21), emergency stop protection unit (22) and filter circuit (12) to connect with the DC regulated power supply (11) in turn, and the voltage and current detection unit (21) detects the voltage value through the voltage sensor and the current sensor and current value, the voltage and current detection unit (21) sends the voltage signal to the voltage display unit (31), and the voltage and current detection unit (21) sends the current signal to the emergency stop protection unit (22), the current control unit (23) and The current display unit (32), the current control unit (23) are connected to the three-phase switching device (13) through the PWM modulation circuit (24), and the three-phase switching device (13) is connected to the brushless DC motor (4). The code circuit (15) is connected with the three-phase switching device (13) and the Hall sensor (5) in the brushless DC motor (4), the Hall sensor (5) is connected with the speed display unit (33), and the DC stabilized power supply (11) and the steering control unit (14) are connected with the Hall decoding circuit (15). 2. According to the described brushless DC motor testing device of claim 1, it is characterized in that: the filter circuit (12) is constituted as follows: an inductance (121), a first capacitor (122) and a second capacitor (123); The capacitor (122) and the second capacitor (123) are connected in parallel with the inductance (121) in series; the inductance (121) is wound with a round copper enameled wire of φ2, and the number of winding turns is 10 to 20 turns; the The first capacitor (122) is a high-frequency ceramic capacitor with a capacitance of 0.1uF; the second capacitor (123) is an electrolytic capacitor with a capacitance of 3300uF.