﻿ 20-sim webhelp > Toolboxes > Mechatronics Toolbox > Servo Motor Editor > Servo Motor Editor > How to use the Parameters

# How to use the Parameters

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# How to use the Parameters

When you enter a new motor, not all parameters have to be filled in. In this section the critical and non critical parameters are listed.

## Critical

Only a few parameters are critical. I.e. they are necessary to generate a 20-sim dynamic model.

 Keyname A unique name to identify the motor. Type The motor type.
 Maximum Torque or Force The maximum short-time or torque or force. Maximum Current The maximum short-time current.
 R The resistance at 25° C. L The terminal inductance.
 J_rotor or m_motor The rotor inertia or the the moving mass of the motor.

## Desired

Some parameters are desired. I.e. they add more detail to the model:

 Nominal Torque or Force Torque or force at nominal operation. Nominal Current Current at nominal operation. Nominal Speed Speed at nominal operation.
 alpha_c The temperature dependency of the coil resistance. ktc The temperature dependency of the magnets. poles or pitch The number of poles (always an even number) or pole pitch (distance N-N poles).
 d Mechanical damping and eddy current losses. T_fric Mechanical friction and hysteresis losses. T_cog The amplitude of the cogging torque.
 Temp_amb The ambient temperature. Temp_initial The initial temperature of the coils and housing. Temp_max The maximum coil temperature. RT1 The thermal resistance between rotor and stator. RT2 The thermal resistance between stator and environment. CT1 Thermal capacity of the rotor. CT2 Thermal capacity of the stator.

If you do not know the values of these parameters, fill in zero. 20-sim will automatically change some into small numbers to prevent division by zero. Because the nominal torque and current are used to derive the torque constant at nominal operation, they will be replaced by the maximum current and torque if you fill in a zero value.

## Torque Speed Plot

Some parameters will add more detail to the torque speed plot:

 Speed The maximum speed. Voltage Maximum short-time voltage. Power The maximum short time power.