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DC Motor Drives

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About DC Motor Drives

DC motor drives act as an interface between a controller and the motor. The drive must match the control signals (voltage and power levels) and signal type (analog or digital). The drive produces power conversion, amplification, and sequencing of waveform signals.  Types of DC motor drives include adjustable or variable speed control, servo control, and integral motion control.  Some drives are capable of delivering adjustable or variable speed control.  Servomotors are generally small, powerful for their size, and easy to control.  Integral motion control includes feedback and a controller.  Important specifications to consider when searching for DC motor drives include considering whether or not a brushless DC motor drive or amplifier is needed.  Some DC motor drives operate in conjunction with a brushless DC motor.  Types of DC brushless motor drives include sine wave, trapezoidal, hall sensor commutation, and no sensor.  

Important operating specifications to consider when searching for DC motor drives include open loop control, positive feedback, tach or velocity module, BEMF or voltage control, torque or current control mode, switching frequency, bandwidth, maximum speed, continuous power, continuous output voltage, maximum continuous output current, and peak output current.  Open loop control uses a tachometer or other device to monitor motor speed, rather than using position feedback to control motor.  Position feedback uses position, force, or other feedback to control motor, in addition to speed sensors.  Use of feedback is referred to as "closed-loop control."  A tach or velocity mode gives direct feedback of motor speed.  A drive with BEMF or voltage control can run without a tach using the motor's Back EMF voltage.  A torque or current control module has constant current control, uses current feedback.  Switching frequency is specified for drives with digital output waves, i.e., PWM.  The bandwidth is the frequency range over which the device meets its accuracy specifications. Accuracy is degraded at lower and lower frequencies unless the device is capable of dc response, and at higher frequencies near resonance and beyond, where its output response rolls off. Frequencies in the database are usually the 3dB rolloff frequencies.  The maximum device speed is the speed when the drive is burdened with no external forces, such as weight.  The continuous power is the maximum amount of power the device can output continuously.   The continuous output voltage is the maximum voltage the device can output continuously.  The maximum continuous output current is the maximum current the device can output continuously.  Maximum current value may require additional cooling.  The peak output current is the peak current the device can output.

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Products & Services Related to DC Motor Drives

AC Motor Drives
AC motor drives interface controllers to AC motors. They match the control signals (voltage and power levels) as well as the signal type (analog or digital). They also provide power conversion, amplification, and the sequencing of waveform signals.
Motion Control Systems
Motion control systems contain matched components such as controllers, motor drives, motors, encoders, user interfaces and software. Components in these systems are optimally matched by the manufacturer.
Motion Controllers
Motion controllers range from simple linear controllers to complex, user-programmable modules that act as controllers within complex integrated multi-axis motion systems.
Motor Controllers
Motor controllers receive supply voltages and provide signals to motor drives that are interfaced to motors. They include a power supply, amplifier, user interface, and position control circuitry.
Motor Speed Controllers
Motor speed controllers are electronic devices that control motor speed. They carry specifications for drive type, product classification, electrical ratings, and operating parameters.
Servo Drives
Servo drives provide electrical drive outputs to servo motors in closed-loop motion control systems where position feedback and corrective signals optimize position and speed accuracy.
Stepper Motor Drives
Stepper motor drives power unipolar and bipolar stepper motors in full step, half step, and microstep motion control applications.

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Engineering Web: DC Motor Drives

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The modern DC motor was invented by accident in 1873, when Zénobe Gramme connected the dynamo he had invented to a second similar unit, driving it as
Electric Motors & DC Motors
This section is split into the electric motor type: AC motors, DC motors, stepper motors and electrical drives.
High Precision Drives and Systems maxon motor - supplier of...
Welcome to maxon motor the Leading Supplier of High Precision Drives and Systems.
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Part Numbers for DC Motor Drives

Part # Distributor Manufacturer Product Category Description
AFS1104CN0C PLC Radwell AVTRON Not Provided DRIVE DC 110AMP MOTOR FIELD SUPPLY
CD1800816RXS771T PLC Radwell AXOR Not Provided SERVO DRIVE 8AMP 110-170VAC FOR DC BRUSHED MOTOR
14A1042X052 PLC Radwell FISHER CONTROLS Not Provided MOTOR DC TIMING - PEN DRIVE

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