DC Geared Motor Speed ​​Measurement Methods and Procedures

A DC geared motor, also known as a geared motor, is a regular DC motor with a matching gear reducer. The gear reducer provides lower speeds and higher torques. Different reduction ratios in the gear reducer can provide different speeds and torques. This significantly increases the usage rate of DC motors in the automation industry. A geared motor is an integrated unit of a speed reducer and a motor. This integrated unit is often called a geared motor or geared gear motor. It is usually assembled and supplied as a complete set by specialized speed reducer manufacturers. Geared motors are widely used in the steel and machinery industries. The advantages of using geared motors are simplified design and space saving. With the rapid development of the motor industry, the application of DC geared motors is becoming increasingly widespread. Many users are unfamiliar with the speed measurement methods for DC geared motors. This mainly involves testing the speed, torque, and performance requirements of the DC geared motor. Below is a brief introduction to the speed measurement methods and procedures!

1. Speed ​​Measurement Method

The shaft of the DC geared motor drives the magnets on the shaft to rotate, thus continuously changing the size of the magnetic field. This magnetic field change is converted into pulse signals by a Hall circuit, amplified, and shaped to output rectangular pulse signals. When the speed changes, the frequency of the output pulses changes, thus obtaining the speed of the DC geared motor.

2. Photoelectric Speed ​​Measurement Method

When the DC motor drives the grid disk to rotate through the transmission part, the speed-measuring photoelectric gate obtains a series of pulse signals. These pulse signals are matched by two timers/counters, one for counting and one for timing. The number of pulses per unit time (m) is calculated, and after unit conversion, the speed of the DC geared motor can be calculated.

Speed ​​Measurement Flow:

(1) Forward and Reverse Rotation

Because the structure of a DC geared motor is very different from that of a DC motor, changing the power supply cannot change the direction of rotation; only changing the relative relationship between the stator winding magnetomotive force and the rotor magnetic field can change the direction of rotation.

(2) Microcomputer Control

DC geared motors are produced and developed using digital control technology. Therefore, using a microcomputer for digital control of DC geared motors is the main control method.

(3) Speed ​​Regulation

Speed ​​regulation of DC geared motors can be achieved by changing the voltage. There are two common methods: one is to keep the conduction time of each phase constant. When each phase is turned on, speed regulation is achieved by changing the voltage amplitude added to the coil. The other is to keep the voltage amplitude constant and change the conduction time of each phase to achieve speed regulation.