Motor Driver MD1D SAWAMURA

MD1D Series

Flexible customization is possible, including stable control performance, operating status output, and electromagnetic brake control.

>>More information

MD3D Series

Driver for DC motors MM16F (2W) to SS23F (10W), SS32G (14W), and SS40E2 (DC24V only).

>>More information

MS-100 Series

This driver uses a DC power supply to control the speed of a DC servo motor over a wide range, from stop to high speed.

>>More information

MD2A Series

This is a motor driver for the DC motor SS40E series (20W-80W) and SS60E (120W) series.

>>More information

Product Information

Format name	Rotation Direction	Input voltage (DC-V)	Current Capacity (A)	Speed Control					Torque control	reference
Format name	Rotation Direction	Input voltage (DC-V)	Current Capacity (A)	Voltage Control	Back electromotive force feedback control	Encoder feedback control	Tachometer generator feedback control	Hall sensor feedback control	Torque control	reference
MD1D	reversible	12, 24, 48	4–12	○		○※			○	detail
MD3D	reversible	12, 24	2	○		○※				detail
MD2A	reversible	AC100V	2	○					○	detail
MS-100	reversible	8 to 32V	5–25	○		○	○		○	detail

* Encoder feedback control pulses of 500 P/R or less are not possible.

What is a motor driver?

The rotation speed of a DC motor can be increased or decreased by increasing or decreasing the applied voltage. In addition, the generated torque can be controlled by controlling the input current.
A motor driver uses this characteristic to control a DC motor. By using a
motor driver, you can control the motor's operation, as well as forward/reverse rotation (compatible models only) and protect the motor with protective functions.

Rotation direction

The direction of rotation of a DC motor can be reversed by reversing the polarity.
Reversible drivers have the function of switching output polarity, and can change the direction of rotation without contacts such as relays. This
function is essential for applications that require frequent forward and reverse rotation.

Current capacity

The current value of a DC motor varies depending on the size of the load. Conversely, if the current is limited, it will not be possible to drive a load greater than that.
When selecting a driver, it is necessary to consider not only the continuous rating of the motor, but also the operating time and required current of the motor to be used.

Related topic: Motor short-time rating (time-limited rating in the range exceeding the continuous rating)

Type of control (speed control and torque control)

Speed Control

The motor speed is controlled by controlling the voltage.

Torque Control

The output torque of the motor is controlled by controlling the current.

Types of speed control (voltage control and feedback control)

<Voltage control>

The rotation speed is increased or decreased by increasing or decreasing the voltage. This is the most basic control method.

<Feedback control>

The speed of a DC motor fluctuates depending on the size of the load. Therefore, it is not possible to keep the rotation speed constant by just controlling the voltage. Therefore, if the rotation speed of the motor is detected and the voltage is increased or decreased so that the speed matches the command value, the speed can be kept constant. This is feedback control. There are several types depending on what is used as the speed detector.

control	overview	Speed detector	Control Range	Speed fluctuation rate	Servo Lock
Back electromotive force feedback control	Simple feedback control is performed by using the motor's back electromotive force. Since there is no speed detector, it is inexpensive but the effect is weak.	Not required	15:1	±15%	-
Encoder feedback control	A motor with an encoder is used for feedback control.	Encoder	100:1	±2% or less	○
Tachometer generator feedback control	Feedback control is performed using a motor with a tachometer generator.	Tachogen	100:1	±2% or less	○
Hall sensor feedback control	Feedback control is performed using the signal from the Hall sensor built into the brushless DC motor to detect the magnetic poles .