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Delco electric motor toxmax czx 184 motors

Delco electric motor toxmax czx 184 motors

Delco electric motor toxmax czx 184 motors

Chapter III Application examples of motor

The packaging workshop of a CD manufacturer is undergoing technical transformation. The project is to connect two packaging machines for production. The scheme is to use the conveyor belt with manipulator for transportation, and the whole is controlled by PLC, supplemented by pneumatic components, positioning components, low-voltage circuit components, mechanical transmission components, etc. to form a closed-loop control loop. The selection basis and relevant calculation of conveyor belt motor are as follows:

1、 Working condition analysis:

The maximum output of the upper sks packaging machine is 6120 boxes per hour, and the general output of the lower chip packaging machine is 70 bags per hour. According to ten boxes, each package is 7000 boxes. The conveying capacity of the conveyor belt should be greater than the upper production speed and less than the lower production speed. Therefore, the conveying speed of the conveyor belt is determined as 6500 boxes and 65 bags per hour, and the size of the CD box is 142 × one hundred and twenty-four × 10. Therefore, the minimum conveying speed of the conveyor belt is: meters per hour, about meters per minute, and the diameter of the transmission stick of the conveyor belt is Φ 20mm, the minimum speed of the conveyor belt driving stick is about min.

The heaviest package of a box of CD is 70g, and that of a package is 10 boxes and 700g. Generally, there are 5-7 packages on the conveyor belt, so the one-time conveying weight of the conveyor belt is -, and the maximum weight is 5kg in calculation. Due to the material positioning, the conveying distance is required to be accurate and the over rotation is small, so the motor must have the following characteristics: braking to maintain the load after power failure; Fast braking speed and small over rotation; It can be started frequently. It has been calculated above that 65 packets will be transported per hour, that is, one packet will be transported for 55 seconds, so the motor must be started and stopped at least twice per minute.

2、 The specific calculation is as follows:

① Pulley mechanism:

Total weight of belt and working object M1 = 10kg

Friction coefficient of sliding surface μ=

Diameter of roller d = 20mm

Weight of roller M2 = 1kg

Efficiency of belt roller η=

Belt speed v = 28mm / s ± 10%

Motor power single phase 220V50Hz

Working time: 24 hours a day

② Determine the reduction ratio of the reduction gearbox:

Reduction ratio output shaft speed: ng = (V60) / (π d) = (28 ± 14) × 60)/(π × 20)=±[r/min]

Delco electric motor toxmax czx 184 motors

Since the rated speed of the motor (4 poles) at 50Hz is about 1500r / min, the reduction ratio i = 60 within this range should be selected.

The reduction ratio I of the reduction gearbox is: I = (1500) / ng = (1500) / ± = 51~

③ Calculate the necessary torque: the torque required when starting the conveyor belt is the maximum. First calculate the necessary torque at start-up.

Friction force F of sliding part= μ m·g= × ten ×= [N]

Load torque TL = f · D / 2· η=× 10-3)/(2 × twenty ×= [N·m]

This load torque is the value of the gearbox output shaft, so it needs to be converted into the value of the motor output shaft. Necessary torque of motor output shaft TM

TM=TL/i· η G=(60 ×= [n · M] = [Mn · M] conduction efficiency of reduction gearbox η G =) considering the fluctuation of power supply voltage (220V ± 10%), the safety rate is set to be 2 times. × 2≈[mN·m]

The power required by the motor PM = ~ tlpnlp, take the coefficient as 2, then

Pm=2T·2πn=2 ×× two × π × 1500/60=

For motors with starting torque above, please refer to the standard motor model / performance table for selection.

Motor: 60yb06dv22, and then select the reducer 60gk60h that can be combined with 60yb06dv22.

④ Confirm the inertia of load: the inertia of belt and working object

Jm1=m1 × (π × D/2π)2 =5 × (π × twenty ×- 3/2π)210 =5 ×- 4[kg·2]10m2

Inertia of roller JM2 = 1 / 8 × two × mD=1/8 × (20 ×- 3)21 × 10-4= × [kg·2]10m

Full load inertia of reducer output shaft J = 5 ×- 4+ ×- four × 10102=6 ×- 4[kg·2]10m

Check the manufacturer's technical manual for the allowable load inertia JM of 60gk60h motor output shaft= ×- 4[kg·2]。 10m2

JG=Jm ×=×- four × 2= ×- 4 [KG · 2] i106010m can be used because J < JG, that is, the load inertia is below the allowable value. The rated torque of the selected motor is 40Mn · m, which is larger than the actual load torque, so the motor can run at a faster speed than the rated speed.

Then calculate the speed of the belt according to the speed without load (about 1500r / min) to confirm whether the selected products meet the specification requirements.

V=(NM·π·D)/60·i=(1500 × π × 20)/(60 × 60)=[mm/s]

The above confirmation results are that they can meet the specification requirements.

To sum up, the analysis and load calculation of load conditions are the basis for the selection of motor and reducer.

Delco electric motor toxmax czx 184 motors

3、 Determine the model of motor and related accessories.

Combined with the actual use of power supply and spare parts in the factory, the electromagnetic braking motor is selected, and the model is 60-yb-06d-v22 (base No. 60, Yb electromagnetic braking motor, 6W circular shaft, single-phase 220V); The supporting reducer model is 60-gk-60h (base No.: 60,6w reducer, reduction ratio: 60, standard structure); The elastic coupling is directly connected with the transmission rod of the conveyor belt. The model of the elastic coupling is 28mc08-08 (nominal outer diameter Φ 28, inner diameter Φ 8); The model of right angle mounting foot of motor is ral60.

Chapter IV selection experience of motor

In the course design of mechanical design last year, there was a part about the principles of motor. At that time, the motor was selected according to the torque. Now think about it, we should consider more conditions, so that the selected motor is the real motor suitable for our design.

Motors play a key role in many motion control functions in many industries, such as packaging, food and beverage, manufacturing, medical treatment and robotics. We can choose from several motor types according to function, size, torque, accuracy and speed requirements.

As we all know, motor is an important part of transmission and control system. With the development of modern science and technology, the focus of motor in practical application has begun to shift from simple transmission to complex control; Especially for the accurate control of motor speed, position and torque. However, motors have different designs and driving modes according to different applications. At first glance, it seems that the selection is very complex. Therefore, for people, basic classification is carried out according to the purpose of rotating motors. Next, we will gradually introduce the most representative, commonly used and basic motors - control motor, power motor and signal motor.

Control motor

The control motor is mainly used in accurate speed and position control, and is used as "actuator" in the control system. It can be divided into servo motor, stepping motor, torque motor, switched reluctance motor, DC brushless motor and so on.

1. Servo motor

Servo motor is widely used in various control systems. It can convert the input voltage signal into the mechanical output on the motor shaft and drag the controlled components to achieve the purpose of control. Generally, the speed of servo motor is required to be controlled by the applied voltage signal; The rotating speed can continuously change with the change of the applied voltage signal; The torque can be controlled by the current output by the controller; The response of the motor should be fast, the volume should be small and the control power should be small. Servo motor is mainly used in various motion control systems, especially servo system.

Delco electric motor toxmax czx 184 motors

Servo motor can be divided into DC and ac. the earliest servo motor was a general DC motor. When the control accuracy was not high, the general DC motor was used as the servo motor. At present, with the rapid development of permanent magnet synchronous motor technology, most servo motors refer to AC permanent magnet synchronous servo motor or DC brushless motor.

2. Stepping motor

The so-called stepping motor is an actuator that converts electric pulse into angular displacement; More generally speaking: when the stepping driver receives a pulse signal, it drives the stepping motor to rotate a fixed angle in the set direction. We can control the angular displacement of the motor by controlling the number of pulses, so as to achieve the purpose of accurate positioning; At the same time, the speed and acceleration of motor rotation can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation. At present, the commonly used stepping motors include reactive stepping motor (VR), permanent magnet stepping motor (PM), hybrid stepping motor (HB) and single-phase stepping motor.

The difference between stepper motor and ordinary motor mainly lies in the form of pulse drive. It is this feature that stepper motor can be combined with modern digital control technology. However, the stepper motor is inferior to the traditional closed-loop DC servo motor in control accuracy, speed variation range and low-speed performance; Therefore, it is mainly used in occasions where the accuracy requirement is not particularly high. Because stepping motor has the characteristics of simple structure, high reliability and low cost, stepping motor is widely used in various fields of production practice; Especially in the field of NC machine tool manufacturing, because the stepping motor does not need a / D conversion and can directly convert the digital pulse signal into angular displacement, it has always been considered as the most ideal actuator of NC machine tool.

In addition to its application in CNC machine tools, stepper motors can also be used in other machines, such as motors in automatic feeders, motors in general floppy disk drives, printers and plotters.

Delco electric motor toxmax czx 184 motors

In addition, stepper motor also has many defects; Because the stepper motor has no-load starting frequency, the stepper motor can operate normally at low speed, but it cannot be started if it is higher than a certain speed, accompanied by sharp whistling; The precision of subdivision drivers from different manufacturers may vary greatly. The greater the subdivision, the more difficult it is to control the precision; Moreover, the stepping motor has large vibration and noise when rotating at low speed.

3. Torque motor

The so-called torque motor is a flat multipole permanent magnet DC motor. The armature has more slots, commutators and series conductors to reduce torque ripple and speed ripple. There are two kinds of torque motors: DC torque motor and AC torque motor.

Among them, the self inductance reactance of DC torque motor is very small, so the response is very good; The output torque is directly proportional to the input current and has nothing to do with the speed and position of the rotor; It can directly connect with the load at low speed without gear deceleration when it is close to the locked rotor state, so it can produce a high torque to inertia ratio on the load shaft and eliminate the systematic error caused by the use of reduction gear.

AC torque motor can be divided into synchronous and asynchronous. At present, squirrel cage asynchronous torque motor is commonly used, which has the characteristics of low speed and strong torque. Generally, AC torque motor is often used in textile industry. Its working principle and structure are the same as that of single-phase asynchronous motor. However, due to the large resistance of squirrel cage rotor, its mechanical characteristics are relatively soft.

4. Switched reluctance motor

Switched reluctance motor is a new type of speed regulation motor, which has extremely simple and solid structure, low cost and excellent speed regulation performance. It is a strong competitor of traditional control motor and has strong market potential. However, there are also some problems such as torque ripple, running noise and large vibration, which need some time to optimize and improve to adapt to the actual market field application.

5. Brushless DC motor

Brushless DC motor (BLDCM) is developed on the basis of Brushless DC motor, but its driving current is AC to the letter; Brushless DC motor can be divided into brushless speed motor and brushless torque motor. Generally, there are two kinds of driving current of brushless motor, one is trapezoidal wave (generally "square wave"), and the other is sine wave. Sometimes, the former one is called brushless DC motor, and the latter one is called AC servo motor. To be exact, it is also a kind of AC servo motor.

In order to reduce the moment of inertia, brushless DC motor usually adopts "slender" structure. Brushless DC motor is much smaller in weight and volume than brushless DC motor, and the corresponding moment of inertia can be reduced by about 40% - 50%. Due to the processing problem of permanent magnet materials, the general capacity of Brushless DC motor is less than 100kW.

This kind of motor has good linearity of mechanical characteristics and regulation characteristics, wide speed regulation range, long service life, convenient maintenance, low noise and no series of problems caused by brush. Therefore, this kind of motor has great application potential in the control system.

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