BTI switch German BTI model BTI price

BTI switch is a switch used to measure the robot's own position. Position switches can be divided into two types: contact switches and proximity switches. It is a switch that can sense the position of the measured object and convert it into a usable output signal. It is a switch that can sense the position of the measured object and convert it into a usable output signal. Position switches can be used to detect position and reflect a certain state. Unlike displacement switches, position switches come in two types: contact and proximity.

BTI switch classification

1) Contact switch: The contacts of a contact switch are actuated by the contact and compression of two objects. Common types include limit switches and two-dimensional matrix position switches. Limit switches have a simple structure, reliable operation, and low price. When an object moves and touches the limit switch, its internal contacts actuate to complete control. For example, if limit switches are installed at both ends of the X, Y, and Z axes of a machining center, the movement range can be controlled. Two-dimensional matrix position switches are installed on the inner side of the mechanical palm to detect the contact position with an object. 2) Proximity switch: A proximity switch is a switch that emits an "actuation" signal when an object approaches within a set distance, without requiring direct contact with the object. There are many types of proximity switches, mainly including electromagnetic, photoelectric, differential transformer, eddy current, capacitive, reed switch, and Hall effect types. The main applications of proximity switches on CNC machine tools include tool selection control for the tool post, worktable travel control, and piston stroke control for oil and air cylinders.

BTI switch working principle

The crankshaft position switch is usually installed at the front end of the crankshaft (at the pulley), at the rear end near the large flywheel, or in the middle of the crankshaft. In early vehicle models, it was also installed inside the distributor. It is one of the most important switches in the control system. Its functions include: detecting engine speed, hence it is also called a speed switch; detecting the top dead center position of the piston, hence it is also called a top dead center switch, including detecting signals for the top dead center of each cylinder for ignition control and the top dead center signal of the first cylinder for sequential fuel injection control.

BTI switch industry applications

1) Brushless DC motor: The position switch is one of the three main components of a brushless DC motor system and is the main feature distinguishing it from brushed DC motors. Its function is to detect the position of the main rotor during motion, convert the position signal of the rotor magnet poles into an electrical signal, and provide correct commutation information to the logic switching circuit to control their conduction and cutoff. This causes the current in the motor armature winding to commutate sequentially as the rotor position changes, forming a stepwise rotating magnetic field in the air gap to drive the permanent magnet rotor to rotate continuously. Brushless DC motors require position switches to measure rotor position. The motor controller accepts position switch signals to synchronize inverter commutation with the rotor, driving continuous motor operation. Although brushless DC motors can also detect rotor position via back electromotive force generated in the stator windings, thereby eliminating the need for position switches, the back EMF signal is too weak to be detected during motor startup due to low speed. Hall effect switch chips used as position switches for brushless DC motors are divided into switching type and latching type. For electric bicycle motors, both types of Hall effect switch chips can be used to accurately measure the position of the rotor magnets. The performance of brushless DC motors made with these two types of Hall effect switch chips, including output power, efficiency, and torque, shows no difference, and they are compatible with the same motor controllers. The application of position switches reduces motor operating noise, improves motor life and performance, and achieves energy savings. The application of position switches undoubtedly provides strong impetus to the development of the motor market. 2) Crankshaft and camshaft: The function of the position switch is to collect crankshaft rotation angle and engine speed signals and input them to the electronic control unit (ECu) to determine ignition timing and fuel injection timing. To distinguish it from the crankshaft position switch (CPS), the camshaft position switch is generally denoted by CIS. The function of the camshaft position switch is to collect the position signal of the camshaft and input it to ECU, so that ECU can identify the compression top dead center of cylinder 1, thereby performing sequential fuel injection control, ignition timing control, and knock control. In addition, the camshaft position signal is used to identify the first ignition timing during engine start. Because the camshaft position switch can identify which cylinder's piston is about to reach top dead center, it is called a cylinder identification switch.

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