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Parsing the dc servo motor controller

by:Hoprio     2020-08-03
Commonly used servo motor has two categories, referred to as ac servo motor with ac power, known as the dc servo motor to dc power supply work. This article only for parsing the dc servo motor controller. The function of the servo motor is the input voltage signal is converted into a shaft angular displacement or angular velocity output, that is to say, the servo motor is refers to the speed and steering change with the size of the input voltage signal and the direction and control of the motor. Servo motor with a certain size of load, in the automatic control system for actuators, so also known as the motor. Automatic control system on the performance of the servo motor can profiles for the following. ( 1) No rotation phenomenon. Before the control signal to the servo motor rotor motionless; After the control signal to rotor rotating rapidly; Control signal disappears, servo motor rotor shall be immediately stop running. The control signal is zero motor continue to roll phenomenon known as the 'rotation' phenomenon, eliminate the rotation is necessary for automatic control system to work normally. ( 2) Low no-load starting voltage. No matter in any position when no-load motor rotor, started from the stationary state to continuous operation of the control voltage is called the initiating. The smaller the starting voltage, the sensitivity of the motor is higher. ( 3) Mechanical properties and the characteristics of the adjustment good linearity, can smooth steady speed in wide scope. ( 4) The characteristic of fast response. The electrical and mechanical time constant is small, which requires moment of inertia of small servo motor. 1. Dc servo motor classification and structure of the dc servo motor is in the automatic control system has a special use dc motor, its structure and general dc motor has no essential difference, is composed of two parts of the stator and rotor. The stator's role is to build a constant magnetic field, mounted on the stator magnetic field winding. Commonly used in dc servo systems, the electromagnetic and permanent magnet dc servo motor. At present, the way of electromagnetic field excited for him, the armature and field winding consists of two independent power supply. Hollow glass of armature permanent magnet dc servo motor it by a stator and a stator, hollow glass, armature, stator rotating in the air gap between. Outside of the stator iron core with a soft magnetic material do, equipped with focus on its core winding ( Made two semicircle magnet poles or generated magnetization on annular magnet steel N, S) 。 Inner stator made of cylindrical soft magnetic materials, it as part of the magnetic circuit, the magnetic resistance can be reduced. The armature is a non-magnetic material ( Such as plastic) Hollow cup made of cylinder, installed directly on the motor shaft. Hollow in the rim of circumferential axial line hollow cup shape with epoxy resin curing winding. Power supply through the brush and commutator on the armature winding. General dc servo motor armature iron core length and the diameter is larger than the ordinary direct current motor, the purpose to reduce its flywheel moment, improve the response speed. In recent years, with the development of technology, produced a new breed of dc servo motor, such as brushless dc servo motor. 2. Working principle of the dc servo motor working principle of dc servo motor and is the same as the ordinary small dc motor. For separately excited dc servo motor, if passing a field current exciting winding, establish a constant magnetic field, when through the armature winding current, can produce electromagnetic torque to the rotor rotation, one of the armature winding and field winding or power, motor immediately halt. To change the size and direction of excitation current, can change the speed of the motor and steering, in order to satisfy the requirement of servo motor control. When the load torque must maintain the armature voltage constant, by changing the excitation current to control the speed of the motor is called magnetic field control. The field current unchanged, by changing the supply voltage to control the motor when the speed is called the armature control. Due to the nature of the latter and precision are ideal, therefore, generally USES the armature dc servo motor control, i. e. using the armature voltage as control signal, and the magnetic field control mode is used only for small power motors. The basic working principle of the dc servo motor is the same as the general dc motor. Excitation winding is connected to a constant voltage, receiving control signals of the armature winding to accept the control voltage signal, flows the armature winding current, its produce magnetic flux and flux produced by the field winding interact with each other, produce electromagnetic torque, rotating the armature. To change the size of the control voltage signal, can change the speed of the motor, to achieve the purpose of speed control. Servo dc servo motor should be paid attention to when using the following items: (1) magnetic dc servo motor armature control when use, should first turn on the excitation source, and then add the armature voltage. Should avoid as far as possible in the operation of the power field winding, lest cause the armature current is too large and the speed of the motor. (2) choose different forms of armature control power, pay attention to its capacity appropriate allowance shall be maintained.
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