Laboratory Experiments > Speed Control > Technical Data

SC30 Speed Control with Variable Load

Mechanics, Motors, Sensors

Two identical DC-motors are mounted on a platform built of aluminium profiles. The drive shafts of the motors are coupled rigid. One motor is used as the drive for the speed control system. The other motor, the generator, is used as variable load. The sensors are a tacho generator and an incremental rotary encoder for the speed. The electrical signals are connected through a multi-pin plug.

 
Mechanical Data:
  • Length : 480 mm
  • Depth : 150 mm
  • Height : 160 mm
  • Weight : 5 kg
Technical Data for both motors:
  • Nominal voltage : 24 V
  • Nominal current : 2 A
  • Nominal power : 30 W
  • Nominal speed : 3000 rpm
  • Nominal torque : 0.096 Nm
Tacho generator:
  • Analog voltage : 5 V / 1000 rpm
Rotary encoder:
  • Power supply : 5 V, max. 150 mA
  • Line count : 1024
  • 2 TTL square-wave signals with index signal

Actuator with signal adaption unit
Inside a 19"-case (length 471 mm x depth 340 mm x height 152 mm, weight 8,7 kg) there are two 4Q-current controllers (servo amplifiers), a signal adaption unit, measurement outputs, power supplies, an analog controller and an electrical disturbance unit.
Mains:
  • 220-240 V, 50 Hz, 200 W
Inputs servo amplifiers
  • Supply voltages: ± 35 V, 50 W
  • Control signal: ± 10 V (0.23 A/V)
Inputs signal adaption unit:
  • 2 control signals, range: ± 10 V (*)
  • Servo amplifier enabled/disabled
  • Speed: 5 V/1000 rpm, V=0.5
  • Monitor of motor current: 0.2 V/A, V=22.0
  • Monitor of generator current
    0.2 V/A, V=22.0
Outputs servo amplifiers:
  • Armature current for the motor/generator: max. ± 2.0 A (± 8.0 A, 10 ms)
  • Current monitor: 0.2 V/A
Outputs signal adaption unit:
  • 2 control signals, range: ± 10 V
  • Speed: 2.5 V/1000 rpm, max. ± 10 V (*)
  • Motor current 2.0 V/A, max. ± 10 V (*)
  • Generator current 4.4 V/A, max. ± 10 V (*)
(*) = Measurement output at the front

 

Analog Controller

Analog PI-control of the speed. Extern control voltage for setpoint of the speed and the amount of the load via BNC sockets. Switches for the release of the servos.

Inputs :
  • Tacho signal from the signal adaption unit:2.5 V/1000 rpm
  • Setpoint for speed: ± 2.5 V/1000 rpm, max.± 10 V
  • Setpoint for the load current: ± 0.215 A/V,max. ± 10 V
Output:
  • Control signal for the motor servo: ± 10 V
Digital Controller
(Option 30-02)

A PC with PCIe slot and a PC adapter card can be used as a digital PI controller. The Option 30-02 contains this card and all necessary connections to the actuator as well as an executable WINDOWS (WINDOWS 7-10) control program.

Inputs :
  • 3 sensor signals ±10 V at 14 Bit A/D converter for tacho voltage and current monitors
  • Input for 4Q-incremental encoder signal
Outputs :
  • 2 control signals for the servo amplifiers ±10 V from 14 Bit D/A-converter
  • Digital enable/disable for servo amplifiers

 

Electrical Disturbance Module

The tacho signal and the control signal for the servo can be switched off manually and scaled by adjusting potentiometers.

 C++ Source of the Software
(Option 30-05)

The PI controller in C-source with libraries for graphic output, controlling the sampling period as well as controlling the PC adapter card requires the Embarcadero C++ Builder V10.

Technical data are subject to change (Date 4-December-2017)