3-Phasen BLDC-Motor Driver

First worldwide: Sensorless and Speedcontrol without PWM-Chopper!

General Description

The sensorless 3-phase BLDC-controller board is a 1-quadrant controller and driver for brushless 3-phase DC motors with outputs of max. 75 watts for speed control. In its current design, this type of electronic device is primarily purposed as evaluation board! There is a special switch mode for the generation of intermediate circuit voltage on the same print. This permits the use of a simple supply unit with transformer setting, bridge rectifier and electrolytic capacitor with 1000uF. Therefore, in certain applications an expensive regulated supply unit for feeding is no longer necessary. This also results in a better overall efficiency of a drive line system! Onboard, the driver holds a trim-pot for speed adjustment, if there is no possibility to set the speed by external control voltage on plug X3. If very stable speed is required even if the load on the motor axle is indeterminate, a PI-control (proportional and integrating control) must be added on X3. In this case, a frequency clock delivers information about the actual speed of the motor and an analogue control signal serves for adjustment setting at Pin 7 (0...5VDC). In addition, the current signal of the output stage is applied at Pin 4 of the X3-plug.
The total current of the phase currents produces a voltage of 100mV/1A. The driver has been tested on various maxon motor ag 3-phase BLDCmotors (EC 22, EC 32). The sensorless driver can be used at electric coils with star or delta connection.


Features
  • Power Supply Range: 13,5V to 34VDC
  • Power Stage drives up to 2,25A/Phase
  • For Motors with delta and Star Coils
  • Speed Control Input (0...5VDC)
  • Input Brake
  • Input Direction
  • Output for current meter of the driver
  • Print Dimensions: B = 62mm, L = 100mm, H = 21mm
  • Save 3 Hall-sensors!
  • No regulating supply unit necessary !

Printboard




Specifications

1. Connectors In-/Outputs

Allocation X3
(10-pol Molex)

Pin No

In-/Outputs

Function

1

Direction

Rotational direction (CW/CCW), internal Pullup 45kOhm to 5VDC

2

GND

Reference-Potential

3

Enable

Coils without current, activ H (int. Pulldown 10kOhm to Gnd

4

Is

Current meter, U = (f) I, [100mV/1A]

5

NOS

Output no Operating Signal, Opendrain 2mA, Motor run: L

6

FG, Tacho

Frequency clock, actual speed, opendrain 2mA

7

Set_Point

Ext. Control Signal (target speed, 0...5VDC)

8

/Brake

Input brake, active L (internal Pullup 45kOhm to 5VDC)

9

Ctrl_U

Monitoring voltage of the internal trimmer (blue)

10

Vcc

+5V (5mA max. e.g. for ext. potentiometer)


2. Motor Connectors

X2, 3-pole Weidmüller screw terminal 3,5mm

Motor connection, clamping range 0,08...2,5mm2(AWG 28...14)

1

Coil A

2

Coil B

3

Coil C


3. Range of Speed

Diagramm Example: maxon EC motor, EC 22 Nr 200860, without charge

maxon EC motor are a Trademark of maxon motor ag in CH-6072 Sachseln (Switzerland).


4. Specifications, maximum ratings

Symbol

Parameter

Value

Unit

VSupply

Max Voltage

34,50

[VDC]

IMot

Motor current (continous

2,25

[A]

PD

Maximum Current (Ipeak)

25

[A]

TJ

Temperatur Range

0...45

[°C]

TSTG

Storage temperature

-10...130

[°C]

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Dokumentinformation:
Copyright © 2003...2009 by Magnetron Labs Merz, CH-3280 Murten, All Rights Reserved.
Document URL: http://www.magnetron.ch/products/BLDC_HM2A5_e.html

Originally Composed: Saturday, July 12, 2003
Date last modified: Friday, April 10, 2009