MV4207-1 DC-Motor Drive


Single-phase 4-Quadrant Rectifier.  The Motor Drive is provided with a CE 3-Phase plug because neutral and phase must not be shifted.

Covers the latest development in DC-motor operation with analogue control. The equipment is designed to work according to different industrial environments. The drive has signal in- and outputs for connections to slave and/or master drives.

To cover a wider range of machines regarding voltage and speed the primary supply is taken from a standard 3-phase outlet which will supply the inverter bridges by 1-phase 230V.

The design will enhance the possibilities of learning the theory and practice of understanding the operation of 4Q-drives for both single drives and the basic understanding of three bridges and their commutation.

The 4-Q-DC-Drive can be used in the conception of speed/torque control versus electro-machine theory.

When braking, the energy is transferred directly to the supplying network by operating in all four quadrants.

Technical Specification


Input voltage:

3-phase 3 x 400 V + N + PE, 50-60 Hz

Input max current:

16 A, rotor inductance is included

Output voltage:

0-250 V DC

Output current:

0 – 12 A (max 16 A)

Nominal output power:

2 kW


Tutorial where the 4Q industrial/professional aspects are enhanced


Manually operated Digital / Analogue

Front control parameters:



DC-tacho or armature voltage

Built-in unit for immediate:

U+I+P signals, isolated, including MUX for oscilloscope.

Built-in protections and contactor relays


520 x 450 x 280 mm


23 kg


Standard Settings

12 Parameters are set manually:

Typically: Speed, Max Speed, Acc ram, Flux, Ret ramp, Ilim, Current/Speed proportional, Current demand in/out, etc.

Floating switches and potentiometers are used to study step response and stability.

The results of the dynamic response regarding voltage, current and immediate power can be studied fully isolated on a standard oscilloscope via the built in isolation amplifier and multiplexer.


Consist of a theory section and an exercise section. The theory part explains for example general theory of the conditions for torque developed in an arbitrary machine, while the exercise section contains theory sections that are directly connected to the different experiments. The Manual consists of a complete binder together with an additional section , which will explain the UIP-unit (Voltage/Current/Power – unit) together with oscilloscope snap-shots showing different operation modes of the rectifier.

Electrical Machines Laboratory