PROGRAMMING SYSTEM NUT

NUT PACKAGE - DRIVE

Fig.1. KINEMATIC DIAGRAM

Direct connection between the machine shaft and the motors shaft is rarely possible (centrifugal pumps, ventilators). Usually one has to add in the drive diverse transmissions like couplings, belt-drive, chain-drive, reduction gear. Application DRIVE is meant to design a drive from these transmissions. It creates a kinematic diagram (Fig. 1), calculates transmissions and efficiency, automatically chooses reducer and motor.

Rotary motion mechanical multistage drives are used for transmitting energy, changing energy, changing velocities and torques. The torque is transmitted from the motor to the shaft of any processing machine via a train combined of the following transmission elements:

• couplings
• belt-drive
• chain-drive
• reduction gear

The package

1. builds up the power transmission flow diagram by connecting the transmission elements in suitable connections
2. makes the necessary calculations of speed ratio, efficiency factor, effective power, shaft rotation speed for each element separately and for the drive as whole
3. selects the parameters, type and size of the A.C. motor according to the load and service conditions

Fig.2. WORKING SHAFT PARAMETERS

The package can help you solve your mechanism design problems:

• to choose suitable reducer and motor from the database
• to choose suitable reducer type to be designed

On Fig. 2 most common working shaft parameters are presented. Down to the right is force scheme. You don't have to insert all values, it's enough to insert two values and the rest of them will be calculated by the computer.Down to the left and to the right different inserting combinations are shown.

On Fig. 1 on the kinematics diagram you can choose transmissions between motor and reducer and between reducer and working shaft. Then you have to mark weather motor is asynchronous (ASEA or 4A series motor) or not. Pressing the NEXT button will open a window where you can select reducer type (Fig. 3).

Fig.3. TYPES OF REDUCERS

On Fig. 3 various types of reducers and some vertical lines are displayed. You can choose amongst those reducers which are crossed by these vertical lines. In addition you must fill in the polus number, it's the number that is written above every vertical line.

When it's done the program will print on the screen the following DRIVE and motor parameters:

DRIVE parameters

• The actual rotation speed of working shaft [rpm]
• and difference from the given rotation speed [%]
• Total speed ratio
• Speed ratio of belt drive
• Speed ratio of reducer
• Speed ratio of chain drive
• Torque [N*m]
• Efficiency factor

Motor parameters

• Nominal power of motor [kW]
• Frequency of rotation [r/p.min]
• Coefficient of preloading
• Diameter of shaft of motor [mm]
• Type of motor

10/11/1999 webmaster