Tachogenerators: Reliable Speed Control for Your Electric Motors

In industrial drives, CNC machines, conveyors, and lifting mechanisms, maintaining precise shaft rotation speed is critical. Even the slightest deviation from set parameters can lead to product defects, automation failure, or hazardous situations. For continuous monitoring and speed regulation, tachogenerators remain a trusted and time-tested sensing solution.

At the ASD ELECTRONICS online store, you can buy DC and AC tachogenerators for outfitting and repairing industrial electric motors. We provide high-quality components that ensure the stable operation of your automatic control systems (ACS).

How Does a Tachogenerator Work and Why Is It Needed?

Essentially, a tachogenerator is a small electrical machine (a micro-generator) whose rotor is mechanically coupled to the shaft of the main motor. As the shaft rotates, the tachogenerator produces an electrical signal (voltage) that is directly proportional to the rotation speed.

This signal is sent to a controller or frequency inverter, creating closed-loop feedback. If the motor begins to slow down under load, the system instantly detects this and increases the current supply to bring the RPM back to the required level.

Types of Tachogenerators: Which One to Choose?

Depending on the design and system requirements, two main types of speed sensors are used:

• DC Tachogenerators. The most common choice for high-precision regulation systems. They generate a DC voltage where the polarity easily indicates both speed and direction of rotation (reverse). They offer high accuracy but require periodic maintenance of the brush-collector assembly.
• AC Tachogenerators (Asynchronous and Synchronous). These generate AC voltage (amplitude or frequency). Their primary advantage is the absence of brushes and collectors, making them exceptionally durable and maintenance-free. They are ideal for harsh environments with high dust, moisture, and intense vibration levels.

Where Are Speed Sensors Used?

Despite the rise of modern optical encoders, classic tachogenerators remain indispensable due to their ruggedness, noise immunity, and longevity. They are commonly installed on:

• Lathes, milling, and boring machines;
• Passenger and freight elevator winches;
• Escalators and conveyor belts;
• Paper mills and rolling stands;
• Complex pumping and ventilation systems.

How to Choose the Right Model?

When replacing a faulty tachogenerator or designing a new drive, pay attention to the following specifications:

1. Output Voltage Gradient: Measured in mV/rpm (indicates the voltage the device produces at a specific speed).
2. Nominal Rotation Speed: The maximum RPM at which the sensor maintains its linearity and accuracy.
3. Mounting Type: Flange mounting, foot mounting, or hollow-shaft built-in models.

Why Buy a Tachogenerator from ASD ELECTRONICS?

An error in selecting a speed sensor can be costly—leading to line downtime or motor failure. If you are unsure which model is the correct replacement for your old device, consult our engineers. We will help you select a compatible equivalent based on the nameplate or technical specifications for free.

Benefits of working with us:

• Strict quality control: We supply only certified products from reliable manufacturers.
• Official warranty on all electrical machines.
• Competitive pricing without unnecessary markups.
• Prompt delivery to your facility via trusted shipping companies.

Provide your drives with flawless precision and overload protection. Order tachogenerators from ASD ELECTRONICS—we help your production run without interruption!