Brushless DC motor controller BLD-50

Dimensions of brushless DC motor controller BLD‑50

Description of brushless DC motor controller BLD‑50

The controller BLD-50 is designed to control 3-phase brushless motors with Hall sensors. Maximum current of up to 50 A is suitable for medium and big size motors.

The controller provides current limiting function to prevent motor overload and damage. Four-quadrant phase control allows stabilizing the motor speed for any combination of load and motor rotation directions. An external braking resistor can be connected for long-term braking and operation with high-inertial loads.

The DC brushless motor controller BLD‑50 provides the following functions:

• Analog speed control of a BLDC motor is carried out by a built-in or external potentiometer or analog signal;
• Switching to a second speed when receive an external discrete signal;
• Smooth acceleration and deceleration of the motor, which is regulated using the internal potentiometer;
• Start and stop the motor with the button START/STOP or with a signal to the discrete input;
• Reversing the direction of rotation of the motor with the button DIR or with a signal to the discrete input;
• Emergency stop of the brushless motor in case of breaking the protective electrical circuit HARD_STOP;
• The maximum operating current limit is set by a user within the range from 5 to 50 A;
• Connection of an external braking resistor to dissipate regenerative energy (generated by the motor during coasting, forced rotation);
• Control of an external electromagnetic brake - automatically when start and stop the motor, or using an external discrete signal.
• Indication of alarms with a discrete output signal, error code is available to be read through USB.
• PID coefficients adjustment is available by users when connected to a computer;
• Connection to a computer via USB (TYPE-C) for setting and monitoring drive operating parameters.

Brushless motor speed control:

The following control signal options are available to control the motor speed:

• built-in potentiometer;
• external potentiometer;
• analog signal 0 … 5 V;
• analog signal 0 … 10 V;
• analog signal -10 … +10 V;
• analog signal 4 … 20 mA;
• PWM signal;
• Discrete signal SECOND_SPEED for switching to the second speed (set by the built-in potentiometer)

Discrete input control signals:

• START/STOP – motor start and stop;
• DIR – set motor direction
• SECOND_SPEED – switching to the second speed;
• BRAKE – control of an external electromagnetic brake

The logic of the START/STOP and DIR signals is selected and can be configured by the user in accordance with the system requirements – triggering by the signal level or by the signal edge.

Alarm Indication

The controller BLD-50 provides alarm indication with an external discrete signal FAULT. The current error code is available for reading via USB.

Four-quadrant control of a DC brushless motor.

For general controllers without a four-quadrant control function, speed stabilization is only possible in cases where the load force direction is opposite to the movement direction. The controller BLD-50 provides four-quadrant control of a DC brushless motor. This make it possible to stabilize and accurately maintaining the set rotation speed for any combinations of the motor rotation and load directions.

More about this function is in our article Four‑quadrant DC motor operation.

Four-quadrant control of a DC brushless motor

Limiting the maximum motor current

The controller BLD-50 provides for limiting the maximum current (and output power) of the motor. The limit is set by a built-in potentiometer, the set value can be controlled when connected to a computer via USB.

• Current limit setting – from 5A to 50A;
• Limit response time – 5 s.

External electromagnetic brake control

The controller BLD-50 provides the function to control an external electromagnetic brake of the motor. Brakes are usually built into motors to prevent shaft displacement under the influence of an external force. BLD-50 provides two options for brake control:

• Automatic hold and release when start and stop a motor;
• Brake control using an external discrete signal.