JPH04128099U - pulse motor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pulse motor whose excitation circuit can be realized using commercially available inexpensive module type parts. [Structure] The stator winding is a three-phase winding, and excitation is performed by a three-phase full-bridge inverter circuit.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an improvement of a pulse motor with a built-in permanent magnet.

0002

[Conventional technology]

Usually, this type of pulse motor has a 2-phase or 5-phase excitation circuit. . Figure 5 shows an example of a 5-phase excitation circuit with bipolar connection, and each A set of four transistors Tr is used to supply excitation current to the windings Wa to We. A switching circuit is connected. Figure 6 shows an example of a five-phase excitation circuit using unipolar connection, with two per phase. It has windings (for example, windings Wa and Wa' in the case of A phase). Each winding is switching It is connected to a transistor as an element (for example, Tra, Tra' in the case of A phase). Ru.

0003

[Problem that the idea aims to solve]

In either example, many switching elements are required, and three-phase devices are available at low cost in the market. With a configuration that makes it difficult to use full-bridge module type (general-purpose type) elements. be. For this reason, the cost of the excitation circuit portion of the price per pulse motor is The proportion has to increase. Therefore, the problem of this invention is to use a commercially available inexpensive module type element to excite it. The object of the present invention is to provide a pulse motor that can realize a circuit.

0004

[Means to solve the problem]

The pulse motor according to the present invention has a three-phase full-bridge stator winding. It is characterized by a configuration in which excitation is performed by a type inverter circuit.

[0005]

【Example】 An embodiment of the present invention will be described with reference to FIGS. 1 to 3. In Fig. 2, the stator winding 21 of the pulse motor is a star (dead) of three phases A, B, and C. A three-phase full bridge inverter circuit 22 is connected to each phase. Excitation current is supplied from This type of inverter circuit 22 has six transistors. It is composed of transistors, and the circuit itself is modularized into one package and can be provided at low cost. It is.

[0006] By the way, the HB type (hybrid type) or PM type (permanent type) with built-in permanent magnet In a two-phase pulse motor (manent magnet type), as shown in Figures 3 and 4, AC power corresponding to the phase difference between the motor 41 and the stator 42 is applied as input. By doing so, a predetermined driving force can be obtained. On the other hand, in the case of the three-phase pulse motor shown in Figure 2, the power supply has a phase difference of 2π/3. It can be driven by symmetrical three-phase alternating current with By combining the above points and the excitation circuit with the circuit configuration shown in Figure 2, the three-phase power The motor can be driven by a general-purpose three-phase full-bridge inverter circuit.

[0007] FIG. 1 shows the configuration of a control system for a pulse motor 10 according to the present invention, and shows an excitation circuit. 11 and its control system 12. The excitation circuit 11 corresponds to one of the three phases. It is shown as Become. The control system 12 includes a frequency command circuit 12-1 that converts a speed command value into a frequency command value. When a frequency command signal is received, the frequency is adjusted based on the voltage-frequency characteristic pattern. An f-v conversion circuit 12-2 that outputs a voltage signal corresponding to a command value, and a frequency command signal. PWM (pulse width modulation) circuit 12-3 and each switch of the inverter 11-2 based on the PWM signal. and a base drive circuit 12-4 for controlling the switching element on and off.

[0008] In this control system, when a speed command value is given, the frequency command circuit 12-1 The driving frequency of the pulse motor is determined. Based on the determined driving frequency f -v conversion circuit 12-2 outputs a voltage signal. The PWM circuit 12-3 has a driving frequency Determine the amplitude and angular frequency of the three-phase alternating current based on the number and voltage signal and output the PWM signal. do. The base drive circuit 12-4 turns on the switching element using a PWM signal. , and turn off to supply symmetrical three-phase alternating current to the pulse motor 10.

[0009] Generally, in general-purpose inverter equipment, f- v characteristic. Considering this point, the present invention also uses the f-v conversion circuit 12-2. The inverter 11 has an f-v characteristic that takes into consideration the impedance characteristics of the pulse motor. -2.

0010 This invention can be applied to both HB type and PM type pulse motors, and the winding can also be started. Applicable to both wire connection and delta connection. In addition, either rotary type or linear type It can also be applied to pulse motors.

[0011]

[Effect of the idea]

As explained above, according to the present invention, three phases are connected to the stator winding of a pulse motor. Excitation by a 3-phase full-bridge inverter circuit with star or delta connection By making it possible to Since we can use standard parts, we can provide inexpensive pulse motors. Ru.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a pulse motor control system according to the present invention.

FIG. 2 is a diagram showing the windings of the pulse motor and its excitation circuit according to the present invention.

FIG. 3 is a diagram showing a waveform of an input current supplied to a conventional two-phase pulse motor.

FIG. 4 is a diagram showing the relationship between the stator and rotor of the two-phase pulse motor according to the input current shown in FIG. 3;

FIG. 5 is a diagram showing an example of an excitation circuit for a five-phase pulse motor using conventional bipolar connection.

FIG. 6 is a diagram showing an example of an excitation circuit for a five-phase pulse motor using conventional unipolar connection.

[Explanation of symbols]

10 Pulse motor 11 Excitation circuit 11-1 Converter 11-2 Inverter 22 3-phase full bridge inverter circuit

Claims (1)

[Scope of utility model registration request] 1. A pulse motor having a built-in permanent magnet, characterized in that the stator winding is three-phase connected and excitation is performed by a three-phase full bridge inverter circuit.